Audio Amplifier Tubes
Audio Amplifier Tubes
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 Vintage Pair Tung Sol 6V6GTA Audio Tubes Back Plates Matched TestedNR  US $10.40
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 Dynakit Tube Amp Amplifier with 3 Working Tubes No Audio US $52.10
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 Professional Audio Grade RCA shielding cap for Tube Amp US $5.99
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 Tube 6N3 Buffer Audio Preamplifier Pre AMP Kit For DIY US $9.90
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 RARE NOS MADE IN USA TYPE 394A 394 A WESTERN ELECTRIC TUBE IN EXCELLENT COND US $100.00
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 2 Type 45 Radio Vacuum Tubes 1950s Vintage Audio Triodes US $46.00
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 RARE TWO BRASS PIN LARGE WESTERN ELECTRIC TYPE 258 A 258A TUBE ENGRAVED BASE US $100.00
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 EIGHT AMAZING NOS NIB NEW VINTAGE TYPE 76 AUDIO TUBES RCA PHILCO RAYTHEON GE NOS US $100.00
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 12AX7 6N4 tubes Beijing NOS 8 pcsspecial tone Connoisseur tested US $83.95
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 2 Tubes Telefunken ECC83 12AX7 ecc 83 Tube ribbed matcr L US $79.00
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 2 Telefunken Klangfilm tube amp modules ECC83 EL95 PP US $79.00
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 2 Telefunken Klangfilm tube amp modules 2x EL84 PP 15 Watt US $255.00
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 Four Electro Harmonix 6922 EH E88CC 6DJ8 Vacuum Tubes for Audio Research others US $28.99
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 2 Tubes RSD smooth plate 12AX7 ECC83 for tube amp 2 US $29.00
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 2 Tubes RSD smooth plate 12AX7 ECC83 for tube amp US $29.00
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 2 Tubes DYNACORD 12AX7 ECC83 for guitar tube amp US $29.00
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 RCA TYPE 807 BEAM POWER AMPLIFIER RADIO AUDIO TUBE NIBNOS TEST VERY STRONG US $14.99
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 NOS NIB Telefunken ECC83 12AX7 Dynaco Fisher Marantz Vintage Amp US $99.99
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 JAMES 6123 HS for 2A3 300B PX4 PX25 amp US $185.00
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 2 EA RCA 6AS7G Audio AMP VACUUM Tubes TESTED GOOD NOS Also Closely MATCHED US $49.00
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 2 NOS Gilfillan ADC Power Transformers Supply Tube Amp Amplifier Supply 6L6 US $59.99
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 Thordarson Tru Fidelity Input Transformer T 9010 or T 90A10 Tube Amp Amplifier US $84.99
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 The Fisher 500 C stereo amp restored excellent condition US $430.00
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 Pioneer SA 5800 130 watt integrated stereo amplifier vintage silver works great US $122.50
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 Heathkit SD 1 Amplifier US $149.00
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 Big Mystery 1905s Mono Williamson 807 Hi Fi Amp works NR US $100.00
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 Heathkit A7 mono vintage tube amp good condition plugplay NR US $50.00
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 MCINTOSH C 39 PREAMPLIFIER A V CONTROLLER THX DOLBY INCLUDES REMOTE OWNERS MAN US $576.00
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 1 Vintage RCA 801 A USN Radio Amplifier Tube US $22.72
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 1 Vintage HYTRON VT 25 Brown Base Amplifier Tube US $9.99
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 1 Vintage RCA 801 Ceramic Base Radio Amplifier Tube US $22.72
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 1 Vintage RCA 2A3 Black Plate Radio Amplifier Tube marked USN US $45.00
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 4 RCA Type 45 Radio Amplifier Tubes NOS with Boxes US $184.49
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 4 RCA Type 45 Radio Amplifier Tubes NOS with Boxes 2 US $122.50
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 4 Vintage RCA 2A3 Black Plate Radio Amplifier Tubes marked USN US $76.00
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 2 Type 45 GE Radio Amplifier Tubes General Electric US $9.99
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 2 RCA Type 45 Radio Amplifier Tubes NOS with Boxes US $109.27
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 1 Vintage HYTRON WESTERN ELECTRIC VT 25 A Radio Amplifier Tube US $9.99
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 VACUUM TUBE AUDIO AMPLIFIER US $1.99
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 Stereo Tube Amp 12AX7 6BQ5 6CA4 See Hear it Work in Video US $59.99
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 20 RCA 12AX7 Long Black Plate Tubes w Square Getters US $305.01
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 vintage 40s 2A3 SINGLE PLATE Tube RCA Cunningham engraved base class A hi fi US $350.00
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 WORLDS BEST VT 211 LARGE POWER TUBE AMPEREX TYPE HF 140 HF140 HF 140 NOS US $250.00
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 Vintage McIntosh Preamplifier C 8 from Estate of Yankee Announcer US $495.00
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 Radio Servicemans Repair Course 90 Volumes on DVD US $12.95
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 MINT 1923 Crosley Harko ACE VC Radio w Unusual Panel Orig Brochure Good WD12 US $177.50
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 VINTAGE VACUUM TUBE AUDIO AMPLIFIER US $49.99
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 4 General Electric 6L6 Audio Radio Amplifier Output Tubes Test Good US $9.99
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 Pair Cunningham 6V6G Audio Amplifier Tubes Good US $22.50
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 Early Homemade Tube Type Audio Amplifier Mono US $25.00
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 Pair Mono Eico Hf 35 Chicago Outputs Stereo Serviced Mullard Amplifiers EL34 HF US $578.00
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 Pair Sylvania JAN CHS 6SN7WGTA Military Radio Audio Tubes Strong US $59.00
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 Daven Radio Resistance Coupled Amplifier 1920’s Nice US $100.00
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 Sophia Electric flagship 300B OPT transformers f Western RCA 2A3 tube amplifier US $849.99
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 Extremely Scarce 1956 Audio Craft Magazine ADS TO DIE 4 inc JBL MacIntosh Altec US $8.32
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 1943 RCA 2A3 dual black plate power triode amplifier tube TV 7 tested at 99 US $12.50
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 February 1956 Audiocraft Magazine Tube Amps Jensen G 30 McIntosh JBL Klipsch US $9.02
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 See Your Vintage Components in 1956 Audiocraft Near Perfect Condition Ads 2 Die4 US $9.23
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 Pair 2 Zenith 6J5 G Amplifier Detector Tubes TV 7 tested very good US $25.66
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 2 RCA CUNNINGHAM GLOBE 45 245 345 TWIN TRIODE AMPLIFIER TUBES TV 7 TESTED VG US $137.50
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 Stereo DIY 6L6 Tube Power Amp Amplifier w Fisher 400B Output Transformers Parts US $164.99
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 2A3 45 Stereo Tube Amplifier Singled Ended 6SL7 5U4 SE Tube Amp US $1,299.00
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 MILITARY RADIO ELECTRONICS MANUALS MORE 330 BOOKS DVD US $9.99
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 4 RCA Type 41 Radio Vacuum Tubes Vintage 1940s Audio Pentodes US $9.99
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 2 NATIONAL UNION Type 42 Radio Vacuum Tubes Vintage 1940s Audio Pentodes US $9.99
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 Huge Ham Audio Receiver Amp Tube Lot 500 RCA GE SYL JAN NOS Used NIB US $99.97
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 A pair of Marantz Model 9 Mono Amplifiers US $17,000.00
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 2 Tubes Valvo Philips ECC83 12AX7 Tube match ribbed d US $30.00
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 2 Tubes Telefunken ECC83 12AX7 ECC 83 Tube smooth plate US $89.00
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 2 Tube EF86 6CF8 Audio Tubes Telefunken matched 31 mAc US $39.00
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Guidelines For Finding The Perfect Audio Amplifier
If you have spent a good deal of cash on a pair of good-quality speakers, you want to be certain that you get an audio amplifier that will offer superb audio quality while meeting your budget. I will give various tips about audio amplifier products to aid you make the perfect purchasing decision.
Audio amps appear in all different shapes and sizes. They utilize different technologies and have countless technical specs. By following some easy suggestions, you will be able to pick the type that best fits your application and resources.
The most evident criterion is the size of the amplifier. There are models that are as large as half your living room while several of the newest mini amplifier types are as tiny as a bar of soap. Many amplifiers are rack sized. This permits them to be stacked on top of your other Audio Equipment.
The vast majority of modern audio amps are Solid State amplifiers vs more conventional tube amps. Tube amps have been prevalent a decade or so ago. Unfortunately, tube amplifiers have quite large audio distortion which describes how much the audio signal is degraded by the amp.
Harmonic distortion of tube amps is often as large as 10%. Solid-state amplifiers will have lower audio distortion. On the other hand, distortion will depend on the particular audio amplifier technology. In the past, for the most part "Class-A" and "Class-AB" amplifiers were obtainable which are also referred to as "analog amplifiers". Audio amps which are based on these technologies normally have low harmonic distortion. In addition, this technology is fairly economical. However, the disadvantage is that the power efficiency is merely in the order of 20% to 30%. Power efficiency describes how much of the electrical power is utilized to amplify the audio as opposed to being wasted as heat. Amplifiers with low power efficiency will require quite large heat sinks since the majority of the power is radiated.
In contrast, "Class-D" amplifiers which are also referred to as "digital amplifiers" offer a power efficiency of normally 80 to 90%. This allows the amplifier and power supply to be made much smaller than analog amplifiers. The disadvantage is that many digital amplifiers have larger audio distortion than analog amplifiers though a number of of the most recent types employ a feedback mechanism to minimize distortion to levels of 0.05% and below.
The amp should be capable to offer enough output power to sufficiently drive your speakers which will depend not only on how much power your speakers can tolerate but also on the size of your listening environment. Loudspeaker power handling ability is given as peak power and average power. The peak power value refers to how much power the speaker can handle for a short period of time whilst the average power handling value describes how much power you can drive the loudspeaker at continuously without harm.
In a small listening area, you might not need to drive your loudspeakers to their rated value. 20 to 40 Watts of power would probably be plenty. Notice however that loudspeakers differ in their sensitivity. Usually a low-impedance loudspeaker will be simpler to drive to high volume than a high-impedance loudspeaker. Be sure that your amplifier can drive your speaker impedance. You can easily find the rated speaker impedance range in your amplifier's user manual.
Lastly, make sure that your amp introduces little noise and has a broad enough frequency response. High-quality amps will have a signal-to-noise ratio of at the very least 100 dB and a frequency response of a minimum of 20 Hz to 20 kHz.
About the Author
You can find additional information about audio amplifier technologies and mini amplifier products from Amphony's website.