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Tippmann A-5 Power Tube & Valve Basic Maintenance
 NOS ZAERIX 12AU7/ECC82 Power Electron Tube Amplifier US $1.00 
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 GU-81 GU81 GU-81M GU81M Power TUBE RARE SVETLANA / CERAMIC - METAL BASE / HAM US $69.99
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 EIMAC POWER TUBE US $45.00
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 EIMAC POWER TUBES US $80.00
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 One pcs of BURLE 8122 Beam Power Tube, NOS US $124.99
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 USA Freed Class "A" vintage TUBE POWER TRANSFORMER 500V 2000V Weighs 13 lbs! USA US $85.00
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 Tube, 50B5, CBC Hytron Beam power tube, Audio output US $4.00
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 6LR6 Power Amp Tube Tests100+% NOS Various Brand Names US $29.95
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 One pair (2) of 7094 Beam Power Tubes High Perveance High Power Gain HAM Radio US $27.50
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 Deltron Regulated Power Supply ~ CB or Tube Ham Radio ~ # A6 -3.8 ~ S/N 26928 US $28.00
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 Vintage Sylvania 6JB6 Green Label Power Tube US $15.60
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 PAIR OF NEW OLD STOCK BOXED RCA 6883B (12 VOLT 6146B's) BEAM POWER OUTPUT TUBES US $36.00
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 1 ohm 100 Watts High Power Ceramic Tube Resistor, 100W US $14.50
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 JAN CIM EIMAC 4-1000A 8166 HAM RADIO POWER TETRODE AMPLIFIER TUBE US $150.00
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 EIMAC 4CX15000A Beam Power Tube (NOS) US $1,200.00
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 6KD6 Power Tube Tested 100% Good Various Brands US $39.95
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 USA Vintage TUBE Power Transformer 400 mwv, 225 mwv..Vitro Eng TUBE AMP PROJECT! US $75.00
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 POWER TETRODE TUBE GU-74B / 4CX800A GU-74 New BOXED + Socket US $175.00
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 Eimac 4CX250B Power Vacuum Tubes US $79.00
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 USA General Precision vintage TUBE POWER TRANSFORMER Prim 325wv Sec 165wv @4.4A US $45.00
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 GS-23B Power Tube US $200.00
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 3-RCA 815 VT-287 power amplifier transmitting tubes.All TV-7 test over 100% US $9.99
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 NOS Sylvania 6LR6 Power Tube Tests 100% - Rare US $30.00
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 2ea. 2C39A UHF Power Tube US $22.84
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 Eimac Power Tube, 8877 3CX1500A7, NIB NOS DC 9207 S/N HNN 527 purchased new 1992 US $799.95
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 KLV 1000 HAM RADIO HIGH POWER LINEAR AMPLIFIER APRIL 2002 WORKS BUT NEEDS TUBES US $275.00
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 AMPEREX 7580W 4CX250R TRANSMITER POWER RF TUBES LOT OF 3 US $248.00
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 TUBE REGULATED POWER SUPPLY 4 AUDIO AMP AMPLIFIER HF TRANCEIVER HAM RADIO US $15.00
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 6JB6A GE Beam Power Pentode Tube NEW US $40.00
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 GI-23B GI-23 GI23 CCCP Soviet PULSE TRIODE POWER TUBE / HAM US $36.99
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 NOS Stancor RT-204 Vacuum Tube Power Supply 6.3V++ US $29.00
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 GS-35B 2,5kW Power Tube. NEW IN BOX! US $189.50
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 GU-74B same as 4CX800A Tube for power amplifier EME HF VHF QRO GU74B ham radio US $160.00
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 SK1A NEW Socket for GU-74B power amplifier tube HF VHF UHF QRO 4CX800A US $34.00
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 Used SK1A Socket for GU-74B power amplifier tube HF VHF UHF QRO 4CX800A US $18.00
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 SYLVANIA 13GB5 XL500 - SINGLE BEAM POWER TUBE US $9.99
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 GS-35B Tube for power amplifier EME HF VHF UHF QRO GS35B ham radio US $120.00
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 GU-84B Brand New Tube for power amplifier HF VHF UHF QRO 4CX2500A ham radio US $450.00
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 Varian 01008290-03 TWTA Tube Amplifier Power Supply US $799.99
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 Eimac Amplifier Varian Tube Radial Beam Power Tetrode US $480.00
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 AMPEREX 6907 TETRODE BEAM POWER HAM Tube US $14.99
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 GS-35B GS-35 GS35 CCCP Soviet TRIODE POWER TUBE / HAM US $139.99
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 Factory New 3CX1500D3 Industrial RF Power Triode Tube US $999.99
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 RCA YASEU / DRAKE POWER TUBES 6146A / 6146 AND 12BY7 TESTED EXCELLENT VINTAGE US $99.99
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 TWO RCA YEASU AMPLIFIER POWER TUBES TYPE 6146 / 6146A BLACK PLATES TESTED GREAT! US $79.99
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 QQE03/20 RF power output tube Philips / FREE SHIPPING US $29.95
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 GS-35B GS35 GS-35 RUSSIAN POWER TRIODE TUBE QTY: 1Pcs. US $170.00
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 GI-7BT Brand New Tube for power amplifier HF VHF UHF QRO ham radio GI-7B US $37.00
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 GI-46B Tube for power amplifier EME HF VHF UHF QRO GI-46B ham radio US $58.00
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 GMI-11 Brand New Tube for power amplifier HF QRO ham radio US $80.00
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 New Sylvania 6LR6 Power Tube Tests 100% - Rare US $39.95
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 Tube, 6AS5, GE 6AS5 Beam power tube US $5.00
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 Tube, 6AS5, GE and Sylvania 6AS5 Beam power tube US $5.00
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 (1) 6LX6 High power tube Tested Good !!!! US $39.95
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 Vintage Cornell Dubilier Battery Eliminator Power Supply Parts ! Tube Radio ! US $31.99
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 1 CBS Hytron 5514 Power Triode Tube ~ Upgraded 811A US $45.00
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 large BALLOON TUBE TAYLOR T Z20 / TZ20 / T-Z20 / 20 POWER TRIODE EXCELLENT COND US $119.99
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 5 Zenith 21GY5 Beam Power Amp. TUBES In Orig. Boxes US $12.95
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 5 Zenith 17GJ5 Beam Power Amp. TUBES In Orig. Boxes US $12.95
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 EIMAC 7034 4X150 NEW "in the Can" VHF HAM RADIO POWER AMPLIFIER TUBE US $40.00
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 Narco VC-27 VHF Aircraft Tube Radio Transmitter Receiver+v12 P-5 Power Supply US $40.00
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 5933 807W JAN CHS 5933 Bendix Radio SYLVANIA BEAM POWER TUBES NOS 1959 Pair qt2 US $39.50
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 6LR6 Power Tube Tested @ 100 to 105% Nice NOS Tubes US $32.50
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 SK-406B Type Glass Chimney for 3-500Z / 4-400A / 4-250A Power Tubes BRAND NEW! US $34.99
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 Varian 0-1000035-00 Power Supply for Klystron Microwave Tube ~V US $3,566.18
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 QB3/300 C1108 RF power output tube / NIB / NOS / FREE SHIPPING US $69.95
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 Socket for GU-84B power amplifier tube HF VHF UHF QRO GU84B 4CX2500A US $145.00
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 VINTAGE EIMAC TUBE 4-250A JAN-CIM-5D22 RF POWER 6335 3U 2606 NOS-? ORIGINAL BOX US $105.00
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 Freed Power transformer for tube amp 600V-200mA!! (T-102 / no. 16624) US $89.90
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 High Voltage Power transformer for tube amp 1100V at 210mA!! US $89.90
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 GU-74B same as 4CX800A Brand New Tube for power amplifier HF VHF QRO ham radio US $140.00
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 GU-34B-1 ( GU 34-1 ) POWER TETRODE TUBE NEW!!! US $95.00
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 NEW IN BOX 7701 BEAM POWER TUBE US $4.00
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 RCA JAN 832-A Push-Pull RF Beam Power Amplifier Tube - Balanced Triodes US $25.00
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 1 NOS Eimac JAN 4CX300A / 8167 RF Power Tube NIB US $75.00
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 EIMAC 8964 JAN POWER TUBE STORED IN BOX 44 US $125.00
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 MINT NOS NIB MATCHED PAIR RCA 8072 POWER TUBES NOS NIB WITH PAPER WORK THE BEST US $119.99
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 Eimac Power Grid Tubes Care and Feeding US $9.99
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 Eimac 4CX250K Ceramic VHF/UHF Power Output Electron Tube Mil Spec JAN-8245 US $13.99
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 GI-39B VHF 150kW pulse Power Tube. New in Box! US $109.50
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 Old Vacuum Tube Radio How To Plan Regenerative Receiver Power Supply Book Photo US $18.67
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 4 MINT NOS NIB 6KN6 AMPLIFIER POWER TUBES GREY PLATE US $129.99
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 MATCHED EUROPEAN PAIR MOTOROLA ECL82 68M8 POWER TUBES US $88.88
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 GS-31B Brand New Tube for power amplifier HF VHF UHF QRO GS31B ham radio US $80.00
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 GS-23B Brand New Tube for power amplifier HF VHF UHF QRO ham radio 4CX1600U US $140.00
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 VINTAGE HEATHKIT IP-27 REGULATED TUBE HV HIGH VOLTAGE DC RADIO POWER SUPPLY IP17 US $147.99
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 RARE: 1958 Coyne Electrical School Tube Radio Student Manual Book AC Power US $14.99
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 10 ohm 100 Watts High Power Ceramic Tube Resistor, 100W US $14.50
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 6 ohm 100 Watts High Power Ceramic Tube Resistor, 100W US $14.50
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 16 ohm 100 Watts High Power Ceramic Tube Resistor, 100W US $14.50
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 2 ohm 100 Watts High Power Ceramic Tube Resistor, 100W US $14.50
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 8 ohm 100 Watts High Power Ceramic Tube Resistor, 100W US $14.50
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 Toshiba 6JS6A RF power output tube NOS / NIB / FREE SHIPPING 6js6 US $59.95
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 NEW IN BOX AMPEREX SD694 POWER TETRODE TUBE US $44.95
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 VINTAGE HAM RADIO VACUUM POWER TUBE NATIONAL ELECTRONIC NL-810 4 PIN BOX $0 SHIP US $112.50
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 6JS6B Realistic Compactron Beam Power Pentode Tube NEW US $50.00
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 RCA JAN-CRC-6146/822 Beam Power Tube #3000533 US $33.95
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 (2) Nice NOS Matched Code 6LR6 Power Tubes Tests 100% - Rare - Matched pairs US $99.95
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Power Tube
How Tiny Can They Get? - The Latest Super-Miniature Audio Amplifiers
Latest types of audio super-mini amplifiers prove that audio technology has gone the same route as computer technology and cell phones. Products are shrinking at a rapid pace. At the same time, manufacturers are packing in more and more features. In the past, tube amps would be commonplace and take up a big part of the living room. Tube amps still have their fair share of fanatics. Nonetheless they have been replaced by solid-state amps for the most part.
While traditionally there would be separate pre amp and power amp stages, today's solid-state amp unite everything into a neat package no larger than the size of a VCR. A new generation of super-miniature amplifiers, such as the Amphony Model 100 microFidelity amp, has become possible due to new developments in audio technology regarding power efficiency. These mini amps use no more space than a deck of cards but deliver up to 50 Watts, which is plenty to drive a speaker to high volume.
"Class-A" and "Class-AB" amplifier topologies were the two most important amplifier architectures of past audio amplifiers. These technologies have rather low power efficiency. Analog audio amplifiers by nature only convert a small portion of the power they consume - normally in the order of 20% to 30% - into audio while a large part is dissipated as heat. Therefore analog amplifiers require a fair amount of cooling. The amount of cooling depends on the amplifier rated output power. These heat sinks prevent the amplifier to be built into a small form factor.
"Class-D" amplifiers are based on a digital design which provides larger power efficiency than "Class-A" or "Class-AB" amplifiers - typically in the order of 80% to 95%. Consequently only a small portion is wasted as heat which was the key in being able to miniaturize audio amplifier designs. One major difficulty which has slowed the growth of "Class-D" amplifiers is audio distortion which is caused by nonlinearities of the switching output stage.
More recent "Class-T" and newer "Class-D" amplifier architectures, such as Amphony’s Model 100, incorporate a feedback mechanism where the output of the amplifier is fed back to the input. By using this feedback, the amplifier can compensate for nonlinearities of the output stage. This allows the distortion to be reduced to levels similar to analog audio amplifiers. At the same time the amplifier offers the high power efficiency of digital amplifiers.
These new miniature audio amplifiers open up applications where traditional amplifiers have failed. They are suited in particular for installations with minimum space, such as in ceiling speakers. Other applications include connecting speakers to a DVD/MP3 player or cable box.
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