4cx800 Amplifier

The first Svetlana 4CX800 data sheet stated that this tube is the same as the GU74 widely used in the Eastern Europe. 5kW continuous RF output on all commonly used modes and on any authorized amateur frequency from 1. Meters Plate current, plate voltage, screen grid current, screen voltage, everything but power out monitoring. See below for more info. Probably the GU74 were in great surplus in the early '90's as other russian tubes also. It appears that the future is the Rusky tubes. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. Front of 144MHz Amplifier. Inductor: 24 uH, Caps: 250 pF var. Chebychev Low Pass Filter. It covers the 160 through 10 meter amateur bands. 10 meters: Single Elecraft K3 transceiver, no second receiver board. Even though the Russian military tube, which has flooded the world market, are Russian military. Capable of 1. The Alpha91b is an old-school amplifier with just a few Integrated Circuits and no Microcontrollers. KickEQ™ 6dB variable bass boost for those additional low frequencies. This amplifier uses two 15A fuses for standard 240 Vac operation. Input network. Output network. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. The Manual includes all schematics is available from RF-Concepts or other sources like DG1STG's website. com goes on vacation from 11 to 27 April 2018. I run my home brew triple 4CX800 amp at the legal limit for AM and I think my Heathkit KL-1 "Chippewa" with a very well built external supply would come close but my other SSB amps rated for the old 2KW PEP SSB limit would fall far short (SB-220, Drake L-4 and L-4B, 30S-1, Thunderbolt, GSB-201 MK. Per basic amplifier theory no tube will be as efficient in class A --. or Best Offer +$10. 73, Jack, W9GT ----- Original Message ----- From: "Colin Lamb" To: "Amps reflector" ; "W9GT" Sent: Tuesday, December 04, 2001 11:34 AM Subject: Re: [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters > Jack said: > > "Much of the literature contends that a tuned input is better for. Svetlana GU-74b. Add to Cart. BOSS Audio Systems KIT2 8 Gauge Amplifier Installation Wiring Kit - A Car Amplifier Wiring Kit Helps You Make Connections and Brings Power To Your Radio, Subwoofers and Speakers #1 Best Seller BOSS Audio Systems R1100M Riot Series Car Audio Subwoofer Amplifier - 1100 High Output, Monoblock, Class A/B, 2/4 Ohm Stable, Low/High Level Inputs, Low. Power tetrode 0. eaglemade vacuum tubes capacitors relays chimneys 3cx3000a7 3cx5000 yc-156 yc-179 linear amplifiers cb radio transmitters 3cx10000a7 3cx15000a7 teflon chimneys EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps. 600 Amp Power Supply. Today I use just a single GU74B in an Acom 1000 amp, I have one tested back up and rotate them once a year, I run the amp at 800W on CW and between 900w to 1000w pep on SSB and it is clean as could be. 1 amplifier delivers as much as 800 watts into one bass channel. Inductor: 24 uH, Caps: 250 pF var. The amp should display "ACOM-1000" in the front LCD display. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits, they may produce much more power and exhibit very long life. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. + 220 pF fixed / 5 KV & 1000 pF var. The item "Dentron MLA-2500 Amplifier Amp 4cx800 Conversion $375 C MY OTHER HAM RADIO GEAR" is in sale since Wednesday, December 16, 2020. If you have questions or concerns about any of the videos or the equipment posted within them you can contact me at. , all of which the builder is prone to. com (W9GT) Date: Tue, 4 Dec 2001 12:01:01 -0500: Thanks, Colin. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. Array Solutions Power Master digital wattmeter. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. The tube has a low inductance cylindrical filament tank circuit for VHF operation. SKU: 4CX1500B-1. 7 out of 5 stars. Install the fuses and fuse caps on the back of the amplifier. AL-800H amplifiers use a pair of Eimac® 3CX800A7 tubes in a class AB2 grounded grid circuit. GU 74b Acom amplifier tetrode 4CX800/GU74b tube for Acom 2000A, Acom 1000, Acom 1010. Thank you for viewing my youtube channel. Power tetrode 0. It took lots of drive and would only run about 800 watts. Input network. Eimac 4CX1500B HF Power Amplifier. If you have questions or concerns about any of the videos or the equipment posted within them you can contact me at. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". Capable of 1. Eimac 4CX1500B HF Power Amplifier. The GU-74b is fully equivalent to the modern 4CX800A tube. Its efficiency is 1000 Watts input for 500 Watts out as radiated power. Acom 2000A 2 x 4cx800 amp. Two tube 4cx800 output test. Thank you for viewing my youtube channel. The tubes were old broadcast 'pulls' and didn't perform very well. It took lots of drive and would only run about 800 watts. Screen Grid (g2) and Control Grid (g1) Supply. === ARRAY Solutions sells OM Power and Acom HF Amplifiers -- BOTH which use the 4CX800 Tetrode. Tube is NEW, NOS and never used before!. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. Plate Line Of The 144 MHz Amplifier With GU74b. 00 shipping. Today I use just a single GU74B in an Acom 1000 amp, I have one tested back up and rotate them once a year, I run the amp at 800W on CW and between 900w to 1000w pep on SSB and it is clean as could be. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. Eimac Transmitting Tube. The tubes were old broadcast 'pulls' and didn't perform very well. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. Two tube 4cx800 output test. One Tube 4cx800-Single Tube 4cx800 Vacuum Tube transmitter. The Alpha91b is an old-school amplifier with just a few Integrated Circuits and no Microcontrollers. Install the fuses and fuse caps on the back of the amplifier. Amp hf 3000 wattamplificatore lineare hf con parallelo di 2 4cx800. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics. GU-74B / 4CX800 / 4CX800A TETRODE TUBE SVETLANA IX-74+1x SOCKET SK1A PL21B-1B. + 220 pF fixed / 5 KV & 1000 pF var. 144 MHz Amplifier Schematic. 750W Output with 15W Input. Like most amplifiers utilizing the 4CX800 tetrodes, this one has a trip circuit to protect the screen grid from excessive current. The performance characteristics of the GU74B (4CX800A) allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. The 4cx3000a/8169 is designed to be used as a. It took lots of drive and would only run about 800 watts. This amplifier is composed of two main sections: the high-voltage power supply and the RF deck. These tubes are direct replacements for use in some of the best-built RF power amplifiers, including Alpha 99, 91B, 8100; ACOM 1000, 1006, 1010, and 2000A and Command Technologies, and several other. New Releases. Welcome to my favorite part of my web site. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!!CAN EASILY COST $200. The Manual includes all schematics is available from RF-Concepts or other sources like DG1STG's website. Eimac 4CX1500B HF Power Amplifier. amplifiers made today in this legal limit ++ class utilize either 3CX800 Eimac ceramic/metal triodes or Svetlana ceramic/metal 4CX800A/GU74B tetrodes. Massive Hipersil tape-wound. The GU-74b is fully equivalent to the modern 4CX800A tube. Computer control. Ελευσίνα - Προστέθηκε πριν 59 ημέρες. These tubes are direct replacements for use in some of the best. 3cx3000a7 amplifier for sale can offer you many choices to save money thanks to 23 active results. After some time, the 4CX800 data sheet did not mention about the GU74 anymore, but did not state about any difference also. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. Thank you for viewing my youtube channel. The '3' in 3CX800 means triode, the '4' in 4CX800 means tetrode -- so they won't be compatible. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. Call your ACOM dealer! Assuming you have the proper display, after 30-60 seconds press the red ON/OFF button on the front. As a linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key Down CW in any of the three modes: grid-driven, grid-driven passive input, and cathode-driven. Time Owned: 3 to 6 months. or Best Offer +$10. 00 shipping. Circuit of the grounded-screen amplifier with the control grid returned to a tap on the bifilar filament choke. Today I use just a single GU74B in an Acom 1000 amp, I have one tested back up and rotate them once a year, I run the amp at 800W on CW and between 900w to 1000w pep on SSB and it is clean as could be. Even though the Russian military tube, which has flooded the world market, are Russian military. 00 shipping. I run my home brew triple 4CX800 amp at the legal limit for AM and I think my Heathkit KL-1 "Chippewa" with a very well built external supply would come close but my other SSB amps rated for the old 2KW PEP SSB limit would fall far short (SB-220, Drake L-4 and L-4B, 30S-1, Thunderbolt, GSB-201 MK. Thank you for viewing my youtube channel. The performance characteristics of the 4CX800A allow its use as a high gain grid-driven RF amplifier or as used in grounded grid service. Solid State HF Amplifier 16 MRF150 2. GU 74b Acom amplifier tetrode 4CX800/GU74b tube for Acom 2000A, Acom 1000, Acom 1010. The SK-1A has a built-in annular screen bypass capacitor , SVETLANA TECHNICAL DATA 4CX800A High Performance Tetrode T he Svetlana 4CX800A is a high , performance characteristics of the 4CX800A allow its use aas a high gain grid-driven RF. Pyle Hydra Marine Amplifier - Upgraded Elite Series 800 Watt 4 Channel Micro Amplifier - Waterproof, GAIN Level Controls, RCA Stereo Input, 3. As a linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key Down CW in any of the three modes: grid-driven, grid-driven passive input, and cathode-driven. Plate Line Of The 144 MHz Amplifier With GU74b. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. Now, there is the possibility the 4CX800 can be operated as if it were a triode. See full list on robkalmeijer. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. item 4 Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. The amp should display "ACOM-1000" in the front LCD display. All grids were grounded. Like the sound of that? Circuit description. Add to Cart. SKU: 4CX1500B-1. Source: www. GU-74B / 4CX800 / 4CX800A TETRODE TUBE SVETLANA IX-74+1x SOCKET SK1A PL21B-1B. Call your ACOM dealer! Assuming you have the proper display, after 30-60 seconds press the red ON/OFF button on the front. all the internal wiring was a total laugh will components hanging in mid air,the power supply doubler was laid out on a scrap piece of plexiglass all scratched and crooked on one end. New Old Stock, New In the Box * No longer available for export. If you wish to operate the amplifier on a line voltage other than 240 Vac, the jumpers on the power transformer primary windings must be changed. This amplifier is intended for CW, SSB, and RTTY and is designed conservatively for continuous duty (key down) operation in any mode at 1500W RF output, with an additional 3 db of headroom to minimize IMD products or damage caused by accidental mistuning, wrong antennas, etc. cost amplifier with good intermodulation performance can be designed. I have the manual and box. See below for more details. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. Current equipment in the shack. 5 peak amp steel core transformer and high capacitance grade filter capacitors, also features time delay starting to protect the tube from over current load. Add to Cart. All switching functions, no relais switching under power conditions, soft start inrush, 150 sec delay time for full power, 2. [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters: From: [email protected] With 1,200 watts input when used as linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. This is the heart of my HF amplifier project. Massive Hipersil tape-wound. or Best Offer +$10. Circuit of the grounded-screen amplifier with the control grid returned to a tap on the bifilar filament choke. they won't be compatible. or Class B amplifier in rf applications including the VHF band. KickEQ™ 6dB variable bass boost for those additional low frequencies. Green Heron Engineering rotator controller for TX2 f/u/w 120 foot high Yagi. This amplifier is finally more or less finished. To be honmest I have only seen the 4CX800A for sale on E bay and once on QTH. Acom 2000A 2 x 4cx800 amp. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. com (W9GT) Date: Tue, 4 Dec 2001 12:01:01 -0500: Thanks, Colin. Tetrode amplifiers like the 4CX250, 4CX800 and 4CX1000 use the grid as the most common way of switching the valve from transmit to standby. 00 PLUS JUST TO SHIP TO YOUR. GU-74B / 4CX800 / 4CX800A TETRODE TUBE SVETLANA IX-74+1x SOCKET SK1A PL21B-1B. Bottom View. Two 4CX800 Svetlana tetrodes. ARRL Lab measurements show this amplifier - operating at 14. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. Thank you for viewing my youtube channel. It took lots of drive and would only run about 800 watts. 5 peak amp steel core transformer and high capacitance grade filter capacitors, also features time delay starting to protect the tube from over current load. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. The Schematic is quite simple and easy to understand. The SK-1A has a built-in annular screen bypass capacitor , SVETLANA TECHNICAL DATA 4CX800A High Performance Tetrode T he Svetlana 4CX800A is a high , performance characteristics of the 4CX800A allow its use aas a high gain grid-driven RF. SKU: 4CX1500B-1. Source: www. The GU-74b / 4CX800A Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. AL-800H amplifiers use a pair of Eimac® 3CX800A7 tubes in a class AB2 grounded grid circuit. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. The tube has a low inductance cylindrical filament tank circuit for VHF operation. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". 50 Ohm, 100 W HF Resistor, 5 pol. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. 3cx3000a7 amplifier for sale can offer you many choices to save money thanks to 23 active results. Meters Plate current, plate voltage, screen grid current, screen voltage, everything but power out monitoring. After some time, the 4CX800 data sheet did not mention about the GU74 anymore, but did not state about any difference also. The Alpha91b is an old-school amplifier with just a few Integrated Circuits and no Microcontrollers. ALPHA 99 The Ultimate Legal Limit Amp. Full CW break-in (QSK) and all digital modes. New (Other) $224. One Tube 4cx800-Single Tube 4cx800 Vacuum Tube transmitter. Probably the GU74 were in great surplus in the early '90's as other russian tubes also. 00 PLUS JUST TO SHIP TO YOUR. 00 Last one +$39. Even though the Russian military tube, which has flooded the world market, are Russian military. Woodbridge, VA. 5 KILOWATT DESKTOP LINEAR AMPLIFIER CAN PUT YOU IN CONTROL. These tubes are direct replacements for use in some of the best-built RF power amplifiers, including Alpha 99, 91B, 8100; ACOM 1000, 1006, 1010, and 2000A and Command Technologies, and several other. I would like to add one thing to my review of these tubes, just look at any amp that has gone threw the ARRL lab on a review such as the Alpha 91B, 99 Acom 2000 or 1000 amp and take a real close look at the IMD specs plus spectrum display, They give the gain and power of the Eimac's way overpriced tubes at 1/3 cost plus. NOS (New Old Stock) Description; We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. My whole ham career of 25 years was using 572B's and Eimac 3-500z tubes. Inductor: 24 uH, Caps: 250 pF var. + 220 pF fixed / 5 KV & 1000 pF var. GU 74b Acom amplifier tetrode 4CX800/GU74b tube for Acom 2000A, Acom 1000, Acom 1010. SOME MANUFACTURES MAY OFFER AMPLIFIERS WITH SIMILAR FEATURES FOR A CHEAPER PRICE. A legal limit "Big Gun" amplifier. 750W Output with 15W Input. Full CW break-in (QSK) and all digital modes. 600 Amp Power Supply. 7 out of 5 stars. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics. If the line voltage wiring is changed, the correct fuses must be installed. The 100 mm diameter anode resonator tube is made from this same Al-plate and connected with Al-rivets. [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters: From: [email protected] Even though the Russian military tube, which has flooded the world market, are Russian military. None of these tubes were sold as matched pairs, that I saw, and they sold from about $150 each. SOME MANUFACTURES MAY OFFER AMPLIFIERS WITH SIMILAR FEATURES FOR A CHEAPER PRICE. GU-74B / 4CX800 / 4CX800A TETRODE TUBE SVETLANA IX-74+1x SOCKET SK1A PL21B-1B. Screen Grid (g2) and Control Grid (g1) Supply. 10 meters: Single Elecraft K3 transceiver, no second receiver board. If it doesn't, something is wrong, and I can't help you. Biggest bunch of thrown together junk ive ever seen,friend of mine paid 1800. If you wish to operate the amplifier on a line voltage other than 240 Vac, the jumpers on the power transformer primary windings must be changed. Add to Cart. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. 7 out of 5 stars. This is a well built rugged amp that easily gets legal limit with about 45 watts drive, with lots of head room. Array Solutions Power Master digital wattmeter. Eimac Transmitting Tube. With 1,200 watts input when used as linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. Ελευσίνα - Προστέθηκε πριν 59 ημέρες. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. Efficient Class-D amplifier. Green Heron Engineering rotator controller for TX2 f/u/w 120 foot high Yagi. NOS (New Old Stock) We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. It is useful at full ratings through 250MHz. they won't be compatible. The GU-74b / 4CX800A Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. 51 FOUR (4) GI-46B W/O Cooler Russian NEW Tube power amplifier QRO HF VHF UHF GI46B. But its "efficiency" is different. Inductor: 24 uH, Caps: 250 pF var. Switching a positive regulated DC supply of 300 to 400 volts switches the valve on and off, and earthing G2 switches it off. Operation with zero grid -plicity by eliminating the bias supply. • Tube --fully protected / works into 3:1 mismatch • Tube -inexpensive to replace --$150 for NOS GU74B • Costly, first time investment. ΛΑΜΠΑ RF GU74 ΡΩΣΙΚΗ 4CX800200,00€. Drive input 150 watt Key & 850 Peak. 4CX250B Datasheet RF amplifier up to 175 MHz - Communications & Power Industries, Inc. I run my home brew triple 4CX800 amp at the legal limit for AM and I think my Heathkit KL-1 "Chippewa" with a very well built external supply would come close but my other SSB amps rated for the old 2KW PEP SSB limit would fall far short (SB-220, Drake L-4 and L-4B, 30S-1, Thunderbolt, GSB-201 MK. Thank you for viewing my youtube channel. All grids were grounded. Now, there is the possibility the 4CX800 can be operated as if it were a triode. [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters: From: [email protected] One Tube 4cx800-Single Tube 4cx800 Vacuum Tube transmitter. This is a well built rugged amp that easily gets legal limit with about 45 watts drive, with lots of head room. Rf amplifier at 30 mhz. I just didn’t find any. All switching functions, no relais switching under power conditions, soft start inrush, 150 sec delay time for full power, 2. Output network. 144 MHz Amplifier Schematic. Biggest bunch of thrown together junk ive ever seen,friend of mine paid 1800. The tube has a low inductance cylindrical filament tank circuit for VHF operation. 4 - Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. If you have questions or concerns about any of the videos or the equipment posted within them you can contact me at. Its efficiency is 1000 Watts input for 500 Watts out as radiated power. A legal limit "Big Gun" amplifier. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. Today I use just a single GU74B in an Acom 1000 amp, I have one tested back up and rotate them once a year, I run the amp at 800W on CW and between 900w to 1000w pep on SSB and it is clean as could be. This amplifier is finally more or less finished. picclickimg. KX2T Rating: 2020-11-09; Great RF tube Time Owned: more than 12 months. This amplifier is finally more or less finished. Tetrode amplifiers like the 4CX250, 4CX800 and 4CX1000 use the grid as the most common way of switching the valve from transmit to standby. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. 5mm Jack, MP3 & Volume Control (PLMRMP3B) 3. Along the way of the repair, I snagged a new pair of Eimac 3cx800A7's and converted this nice amp to these tubes, rather than buying three 8874's. THE HF-2000 1. If the line voltage wiring is changed, the correct fuses must be installed. solif state mrf150 eb104 linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. 750W Output with 15W Input. The GU-74b is fully equivalent to the modern 4CX800A tube. It covers the 160 through 10 meter amateur bands. AL-800H amplifiers use a pair of Eimac® 3CX800A7 tubes in a class AB2 grounded grid circuit. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics. or Class B amplifier in rf applications including the VHF band. JTG Built Steel- Dual 4cx800 GU74B Linear Amplifier. This is a well built rugged amp that easily gets legal limit with about 45 watts drive, with lots of head room. 00 shipping. It is useful at full ratings through 250MHz. , all of which the builder is prone to. If you have questions or concerns about any of the videos or the equipment posted within them you can contact me at. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. All grids were grounded. 4 - Vacuum Tube GU-74B / 4CX800 / 4CX800A Black Diamond Series 7pin Pentode Amplifier Vacuum. They are the perfect choice for SSB operators who enjoy “breaking through the DX pile-up and snagging a new one” without breaking the bank. Svetlana GU-74b. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. Ameritron AL-800H Linear Amplifiers produce 1,500 watts output for operations from 160 through 15 meters**. MFR: Eimac, USA. SKU: 4CX1500B-1. Front of 144MHz Amplifier. 5mm Jack, MP3 & Volume Control (PLMRMP3B) 3. com deals and sales AMPHF - Ten-Tec Titan III Sale --REDUCED PRICE Ten-Tec Titan III HF amp. These tubes are direct replacements for use in some of the best-built RF power amplifiers, including Alpha 99, 91B, 8100; ACOM 1000, 1006, 1010, and 2000A and Command Technologies, and several other. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. Find the best www. I have no idea of the potential for high-fidelity audio of either tube, but either one should make fine audio amplifiers otherwise. 00 for a 2 /4cx250b amplifier brand new and was nothing but junk. These Tetrode RF Tubes were $600 USD for a Matched Pair. com (W9GT) Date: Tue, 4 Dec 2001 12:01:01 -0500: Thanks, Colin. See below for more details. Inductor: 24 uH, Caps: 250 pF var. The first Svetlana 4CX800 data sheet stated that this tube is the same as the GU74 widely used in the Eastern Europe. New Old Stock, New In the Box * No longer available for export. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. Pair of tubes available for $690/set. com deals and sales AMPHF - Ten-Tec Titan III Sale --REDUCED PRICE Ten-Tec Titan III HF amp. 1 amplifier delivers as much as 800 watts into one bass channel. The amp should display "ACOM-1000" in the front LCD display. + 2 nF fixed / 5 KV. If you wish to operate the amplifier on a line voltage other than 240 Vac, the jumpers on the power transformer primary windings must be changed. or Best Offer +$10. item 4 Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. Variable 12dB crossovers provides control to dial in perfect sound. 7 out of 5 stars. Welcome to my favorite part of my web site. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. Eimac Transmitting Tube. eaglemade vacuum tubes capacitors relays chimneys 3cx3000a7 3cx5000 yc-156 yc-179 linear amplifiers cb radio transmitters 3cx10000a7 3cx15000a7 teflon chimneys EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps. or Class B amplifier in rf applications including the VHF band. 00 for a 2 /4cx250b amplifier brand new and was nothing but junk. Full CW break-in (QSK) and all digital modes. ALPHA 99 The Ultimate Legal Limit Amp. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. Henry 3K Classic mkII extensively reworked to make it actually usable. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!!CAN EASILY COST $200. It took lots of drive and would only run about 800 watts. eaglemade vacuum tubes capacitors relays chimneys 3cx3000a7 3cx5000 yc-156 yc-179 linear amplifiers cb radio transmitters 3cx10000a7 3cx15000a7 teflon chimneys EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps. 00 PLUS JUST TO SHIP TO YOUR. The first commercially made amps using the "new Svetlana 4CX800" were actually using GU74's. === ARRAY Solutions sells OM Power and Acom HF Amplifiers -- BOTH which use the 4CX800 Tetrode. Like most amplifiers utilizing the 4CX800 tetrodes, this one has a trip circuit to protect the screen grid from excessive current. They are the perfect choice for SSB operators who enjoy “breaking through the DX pile-up and snagging a new one” without breaking the bank. Ameritron AL-800H Linear Amplifiers produce 1,500 watts output for operations from 160 through 15 meters**. See full list on robkalmeijer. KX2T Rating: 2020-11-09; Great RF tube Time Owned: more than 12 months. As a linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key Down CW in any of the three modes: grid-driven, grid-driven passive input, and cathode-driven. Ελευσίνα - Προστέθηκε πριν 59 ημέρες. Per basic amplifier theory no tube will be as efficient in class A --. Bottom View. To be honmest I have only seen the 4CX800A for sale on E bay and once on QTH. solif state mrf150 eb104 linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. This amplifier is finally more or less finished. ARRL Lab measurements show this amplifier - operating at 14. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics. Here is the datasheet for Svetlana’s 4CX800 / GU74b. Even though the Russian military tube, which has flooded the world market, are Russian military. eaglemade vacuum tubes capacitors relays chimneys 3cx3000a7 3cx5000 yc-156 yc-179 linear amplifiers cb radio transmitters 3cx10000a7 3cx15000a7 teflon chimneys EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps Eagle made built amps EagleMade built Amps. These tubes are direct replacements for use in some of the best. Text: -1A socket is available for use with the 4CX800A. None of these tubes were sold as matched pairs, that I saw, and they sold from about $150 each. ACOM 1010 QST Review - Acom 1010 HF linear Amplifier QST Review december 2006 Acom 1010 Vs Acom 1011 - Forum post on differences between the Acom 1010 (single 4CX800) and Ac Acom 1010 eham Reviews - Reviews of Acom 1010 KW 160 - 10 m PA at eham. 4CX250B Datasheet RF amplifier up to 175 MHz - Communications & Power Industries, Inc. Because of the high performance characteristics of the. Its efficiency is 1000 Watts input for 500 Watts out as radiated power. Inductor: 24 uH, Caps: 250 pF var. Biggest bunch of thrown together junk ive ever seen,friend of mine paid 1800. All grids were grounded. Many years ago I built an amplifier using a pair of 4-400 tubes. MFR: Eimac, USA. 7 out of 5 stars. Meters Plate current, plate voltage, screen grid current, screen voltage, everything but power out monitoring. A legal limit "Big Gun" amplifier. My whole ham career of 25 years was using 572B's and Eimac 3-500z tubes. 5kW continuous RF output on all commonly used modes and on any authorized amateur frequency from 1. solif state mrf150 eb104 linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. These tubes are direct replacements for use in some of the best. The Alpha91b is an old-school amplifier with just a few Integrated Circuits and no Microcontrollers. 5 KILOWATT DESKTOP LINEAR AMPLIFIER CAN PUT YOU IN CONTROL. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. Output network. cost amplifier with good intermodulation performance can be designed. Circuit of the grounded-screen amplifier with the control grid returned to a tap on the bifilar filament choke. New (Other) $224. Because of the high performance characteristics of the. Time Owned: 3 to 6 months. NOS (New Old Stock) Description; We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. When used in a modern amplifier with auto-tuning and vacuum tube protection circuits, they may produce much more power and exhibit very long life. they won't be compatible. As a linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key Down CW in any of the three modes: grid-driven, grid-driven passive input, and cathode-driven. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics. Capable of 1. Tube is NEW, NOS and never used before!. The tubes were old broadcast 'pulls' and didn't perform very well. Full CW break-in (QSK) and all digital modes. • Tube --fully protected / works into 3:1 mismatch • Tube -inexpensive to replace --$150 for NOS GU74B • Costly, first time investment. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. The SK-1A has a built-in annular screen bypass capacitor , SVETLANA TECHNICAL DATA 4CX800A High Performance Tetrode T he Svetlana 4CX800A is a high , performance characteristics of the 4CX800A allow its use aas a high gain grid-driven RF. com goes on vacation from 11 to 27 April 2018. A legal limit "Big Gun" amplifier. The intention is to have a 1500-watt output, brick-on-the-key rated amplifier, usable for all modes -- although the chances of me operating any mode other than CW are small. Green Heron Engineering rotator controller for TX2 f/u/w 120 foot high Yagi. 7 MHz with no time limit. Like the sound of that? Circuit description. Screen Grid (g2) and Control Grid (g1) Supply. ACOM 1010 QST Review - Acom 1010 HF linear Amplifier QST Review december 2006 Acom 1010 Vs Acom 1011 - Forum post on differences between the Acom 1010 (single 4CX800) and Ac Acom 1010 eham Reviews - Reviews of Acom 1010 KW 160 - 10 m PA at eham. or Best Offer +$10. NOS (New Old Stock). Current equipment in the shack. This amplifier uses two 15A fuses for standard 240 Vac operation. Yes, I knew tuned input was an important consideration for a GG amplifier. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. or Class B amplifier in rf applications including the VHF band. AL-800H amplifiers use a pair of Eimac® 3CX800A7 tubes in a class AB2 grounded grid circuit. Its efficiency is 1000 Watts input for 500 Watts out as radiated power. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!!CAN EASILY COST $200. Chebychev Low Pass Filter. Front of 144MHz Amplifier. Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. One Tube 4cx800-Single Tube 4cx800 Vacuum Tube transmitter. Not the literature or the context at fault, just my memory. Three-second turn-on/off delay to eliminate unwanted interference. 00 Last one +$39. A careful visual inspection showed no other damage than the burnt chimney. See below for more info. Inductor: 24 uH, Caps: 250 pF var. The GU-74b / 4CX800A Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. New (Other) $224. Many years ago I built an amplifier using a pair of 4-400 tubes. solif state mrf150 eb104 linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. Spare Tube for ACOM A2000, A1000 and A1010 (4CX800 Eimac Equivalent) Manufacturer's Website. I run my home brew triple 4CX800 amp at the legal limit for AM and I think my Heathkit KL-1 "Chippewa" with a very well built external supply would come close but my other SSB amps rated for the old 2KW PEP SSB limit would fall far short (SB-220, Drake L-4 and L-4B, 30S-1, Thunderbolt, GSB-201 MK. + 220 pF fixed / 5 KV & 1000 pF var. SKU: 4CX350A-Amp. 00 shipping. Because of the high performance characteristics of the4CX800A, the tube will operate efficiently at low plate voltage. Tube is NEW, NOS and never used before!. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. Tube is NEW, NOS and never used before!. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. Variable 12dB crossovers provides control to dial in perfect sound. Even though the Russian military tube, which has flooded the world market, are Russian military. Therefore its gain is 500/100 = 5. Thank you for viewing my youtube channel. Time Owned: 3 to 6 months. This amplifier is finally more or less finished. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. 144 MHz Amplifier Schematic. 00 PLUS JUST TO SHIP TO YOUR. Many years ago I built an amplifier using a pair of 4-400 tubes. This is a well built rugged amp that easily gets legal limit with about 45 watts drive, with lots of head room. 4CX250R RF linear Amplifier, List of Unclassifed Manufacturers. The tube has a low inductance cylindrical filament tank circuit for VHF operation. As a linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key Down CW in any of the three modes: grid-driven, grid-driven passive input, and cathode-driven. Amplificatori Lineari I 5 U X J QRO Home Made Linear Amplifier HF AMPLIFIER. Green Heron Engineering rotator controller for TX2 f/u/w 120 foot high Yagi. SKU: 4CX350A-Amp. San Diego, CA. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. item 4 Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. Power-line requirements 200/240 Vac 50/60 HZ 30+ or - Amps at 240 Vac Power Supply Heavy duty 1. Low grid interception and high am - plification factor combine to make the 3CX800A7 drive power low for a tube of this power capacity. These tubes are direct replacements for use in some of the best. all the internal wiring was a total laugh will components hanging in mid air,the power supply doubler was laid out on a scrap piece of plexiglass all scratched and crooked on one end. Pi and Pi-L refer to the tank circuitry in your tube amplifier. 4 - Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. Many years ago I built an amplifier using a pair of 4-400 tubes. The screen-to-grid amplification factor of most tetrodes, such as the 4-65A, 4-400A, and similar tubes, is approximately 5. This is a well built rugged amp that easily gets legal limit with about 45 watts drive, with lots of head room. I have no idea of the potential for high-fidelity audio of either tube, but either one should make fine audio amplifiers otherwise. Eimac 4CX1500B HF Power Amplifier. ACOM 1010 QST Review - Acom 1010 HF linear Amplifier QST Review december 2006 Acom 1010 Vs Acom 1011 - Forum post on differences between the Acom 1010 (single 4CX800) and Ac Acom 1010 eham Reviews - Reviews of Acom 1010 KW 160 - 10 m PA at eham. The item "Dentron MLA-2500 Amplifier Amp 4cx800 Conversion $375 C MY OTHER HAM RADIO GEAR" is in sale since Wednesday, December 16, 2020. Two tube 4cx800 output test. New Old Stock, New In the Box * No longer available for export. 00 shipping. As a linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key Down CW in any of the three modes: grid-driven, grid-driven passive input, and cathode-driven. New Old Stock, New In the Box * No longer available for export. eBay has several Eastern European (largely Ukraine) reseller of surplus 4CX800 tetrode RF tubes. A careful visual inspection showed no other damage than the burnt chimney. Transmitting Tube Tetrode, Broadcast. 00 PLUS JUST TO SHIP TO YOUR. ARRL Lab measurements show this amplifier - operating at 14. The GU-74b / 4CX800A Svetlana tetrode is used in wide-band non-tunable amplifiers and for single-sideband power amplification in stationary and mobile RF equipment. or Class B amplifier in rf applications including the VHF band. Amplifier cabinet is 1 mm aluminium. 750W Output with 15W Input. + 2 nF fixed / 5 KV. Even though the Russian military tube, which has flooded the world market, are Russian military. com but for the most part I have seen plenty of GU74B tubes for sale. Here is the datasheet for Svetlana’s 4CX800 / GU74b. 73, Jack, W9GT ----- Original Message ----- From: "Colin Lamb" To: "Amps reflector" ; "W9GT" Sent: Tuesday, December 04, 2001 11:34 AM Subject: Re: [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters > Jack said: > > "Much of the literature contends that a tuned input is better for. Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. If you have questions or concerns about any of the videos or the equipment posted within them you can contact me at. Drive input 150 watt Key & 850 Peak. DX Engineering GU74B/4CX800A Ceramic Power Tetrodes are high performance ceramic/metal tetrodes with a plate dissipation rating of 800 watts. It covers the 160 through 10 meter amateur bands. Pi and Pi-L refer to the tank circuitry in your tube amplifier. As a linear amplifier, high power gain may be obtained without sacrifice of low intermodulation distortion characteristics. Output network. I have been sufficiently dressed down for my incorrect reference. These tubes are direct replacements for use in some of the best-built RF power amplifiers, including Alpha 99, 91B, 8100; ACOM 1000, 1006, 1010, and 2000A and Command Technologies, and several other. None of these tubes were sold as matched pairs, that I saw, and they sold from about $150 each. 51 FOUR (4) GI-46B W/O Cooler Russian NEW Tube power amplifier QRO HF VHF UHF GI46B. Power-line requirements 200/240 Vac 50/60 HZ 30+ or - Amps at 240 Vac Power Supply Heavy duty 1. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!!CAN EASILY COST $200. The 4cx3000a/8169 is designed to be used as a. Add to Cart. San Diego, CA. With 1,200 watts input when used as linear power amplifier, the 4CX800A will conservatively produce 750 watts PEP SSB, and 750 watts Key-Down CW. 1 amplifier delivers as much as 800 watts into one bass channel. Chebychev Low Pass Filter. solif state mrf150 eb104 linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. Biggest bunch of thrown together junk ive ever seen,friend of mine paid 1800. I have no idea of the potential for high-fidelity audio of either tube, but either one should make fine audio amplifiers otherwise. Pi-L uses an extra inductor or the addition of a 4:1 unun in the tank coil assembly. New Releases. Now, there is the possibility the 4CX800 can be operated as if it were a triode. These Tetrode RF Tubes were $600 USD for a Matched Pair. or Class B amplifier in rf applications including the VHF band. Ameritron AL-800H Linear Amplifiers produce 1,500 watts output for operations from 160 through 15 meters**. 5 KILOWATT DESKTOP LINEAR AMPLIFIER CAN PUT YOU IN CONTROL. The item "Dentron MLA-2500 Amplifier Amp 4cx800 Conversion $375 C MY OTHER HAM RADIO GEAR" is in sale since Wednesday, December 16, 2020. Massive Hipersil tape-wound. It took lots of drive and would only run about 800 watts. === ARRAY Solutions sells OM Power and Acom HF Amplifiers -- BOTH which use the 4CX800 Tetrode. Its efficiency is 1000 Watts input for 500 Watts out as radiated power. or Class B amplifier in rf applications including the VHF band. Drive input 150 watt Key & 850 Peak. GU 74b Acom amplifier tetrode 4CX800/GU74b tube for Acom 2000A, Acom 1000, Acom 1010. Svetlana GU-74b. 4 - Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. The first Svetlana 4CX800 data sheet stated that this tube is the same as the GU74 widely used in the Eastern Europe. 73, Jack, W9GT ----- Original Message ----- From: "Colin Lamb" To: "Amps reflector" ; "W9GT" Sent: Tuesday, December 04, 2001 11:34 AM Subject: Re: [AMPS] Question : 4CX800 Amplifier 6-10-12-15-17-20 meters > Jack said: > > "Much of the literature contends that a tuned input is better for. Tetrode amplifiers like the 4CX250, 4CX800 and 4CX1000 use the grid as the most common way of switching the valve from transmit to standby. Biggest bunch of thrown together junk ive ever seen,friend of mine paid 1800. item 4 Vacuum Tube GU-74B / 4CX800 / 4CX800A tetrode NEW NOS x 1pc. Probably the GU74 were in great surplus in the early '90's as other russian tubes also. This amplifier is finally more or less finished. Screen Grid (g2) and Control Grid (g1) Supply. Therefore its gain is 500/100 = 5. BE AWARE THIS UNIT MUST GO MOTOR FREIGHT!!CAN EASILY COST $200. ACOM 1000 Tube Amp • ACOM 1000 uses 4CX800 / GU74B Russian tube • Weighs only 50 lbs. This amplifier is intended for CW, SSB, and RTTY and is designed conservatively for continuous duty (key down) operation in any mode at 1500W RF output, with an additional 3 db of headroom to minimize IMD products or damage caused by accidental mistuning, wrong antennas, etc. Transmitting Tube Tetrode, Broadcast. Acom 2000A 2 x 4cx800 amp. The tubes were old broadcast 'pulls' and didn't perform very well. IT CAN BE YOURS FOR AN AFFORDABLE PRICE. 00 shipping. This amplifier uses two 15A fuses for standard 240 Vac operation. Plate Line Of The 144 MHz Amplifier With GU74b. If you have questions or concerns about any of the videos or the equipment posted within them you can contact me at. Three-second turn-on/off delay to eliminate unwanted interference. 1 amplifier delivers as much as 800 watts into one bass channel. Bottom View. The Alpha91b is powered by a matched pair of GU74b / 4CX800 tubes. Like most amplifiers utilizing the 4CX800 tetrodes, this one has a trip circuit to protect the screen grid from excessive current. You can purchase items, but there may be. Circuit of the grounded-screen amplifier with the control grid returned to a tap on the bifilar filament choke. Abstract: simple 20 watts power amplifier. ΛΑΜΠΑ RF GU74 ΡΩΣΙΚΗ 4CX800200,00€. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. 4CX250R RF linear Amplifier, List of Unclassifed Manufacturers. GU 74b Acom amplifier tetrode 4CX800/GU74b tube for Acom 2000A, Acom 1000, Acom 1010. Two 4CX800 Svetlana tetrodes. Efficient Class-D amplifier. I have the manual and box. 50 Ohm, 100 W HF Resistor, 5 pol. NOS (New Old Stock) Description; We sell NOS (New Old Stock) GU-74b or 4CX800 tubes used in the Acom 2000A, Acom 1000, Acom 1010. linear amplifier hf vhf home made with 4cx800 gu74b gu78b 3cx1200 3cx1200a7 8877 3cx1500 4cx250 4cx15000a gu36b. GU-74B Description Hide. Tubes are a pair of 4cx800's. Svetlana GU-74b. You can purchase items, but there may be. They are the perfect choice for SSB operators who enjoy “breaking through the DX pile-up and snagging a new one” without breaking the bank. The '3' in 3CX800 means triode, the '4' in 4CX800 means tetrode -- so they won't be compatible. DX Engineering GU74B/4CX800A Ceramic Power Tetrodes are high performance ceramic/metal tetrodes with a plate dissipation rating of 800 watts. It appears that the future is the Rusky tubes. QRO HF-2000 HF Amp – 1. This amplifier is finally more or less finished. The 1 mm thickness is not too strong so I have to use aluminium profile to make enclosure more rigid. These tubes are direct replacements for use in some of the best.