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Until the invention of the transistor in 1947, all “electronics” were by definition based on the thermionic valve.
The simplest valve was invented by John Ambrose Fleming while working for the Marconi Company in London in 1904 and named the Diode, as it had two electrodes. The diode conducted electricity in one direction only and was used as a radio detector and a rectifier. Simple as it was this was the first active electronic component, Fleming gave birth to the electronic age.
Although he may not have at first realised the significance of his invention it was Lee De Forest who added a third electrode and invented the first electronic amplifying device, the Triode which he named the ‘Audion’. This additional ‘control grid’ modulates the current that flows between cathode and anode for a given voltage between the cathode and anode. The relationship between current flow and plate and grid voltage is often represented as a series of “characteristic curves” on a diagram. Depending on the other components in the circuit this modulated current flow can be used to provide current or voltage gain
The first application of valve amplification was in the regeneration of long distance telephony signals. Later, valve amplification was applied to the ‘wireless’ market that began in the early thirties. In due course amplifiers for music and later television were also built exclusively using valves until the 1950s.
During this period power levels were usually very low (a few watts) and radios often used headphones only, with no loudspeaker at all.
The overwhelmingly dominant circuit topology during this period was the single-ended triode gain stage, operating in class A, which gave very good sound (and reasonable measured distortion performance) despite extremely simple circuitry with very few components: important at a time when components were hand made and extremely expensive.
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Marantz 2110 Scope Tuner See Full Details US $204.26 |
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Pair of Original Boxed Russia 1987 6N30-DR.Supertube! See Full Details US $129.99 |
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Vintage 1961 250 A Lafayette Stereo Tube Amplifier AMP See Full Details US $76.91 |
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5 NOS CBS 12AC6 RF IF amplifier tubes radio audio amp See Full Details US $9.99 |
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2 NOS GE 6X4 6X4WA 6202 Full Wave rectifier tubes Amp See Full Details US $9.99 |
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Dario Mullard GZ32 rectifier Fender Vox TUBE AMP See Full Details US $20.00 |
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tubes4hifi Dynaco ST70 PCB modification See Full Details US $40.00 |
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tubes4hifi Dynaco ST70 modification PCB with parts kit See Full Details US $99.00 |
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tubes4hifi Dynaco ST70 mod PCB stuffed ready to install See Full Details US $139.00 |
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10 Mullard .01uf Tropical Fish Capacitors Fuzz Tube amp See Full Details US $10.00 |
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HICKOK TUBE TESTER FUSE LAMP BULBS ~ # 81 ~ (Qty-3) See Full Details US $5.95 |
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Vintage Motorola ECL82 6BM8 HiFi Tube Amp Amplifier - See Full Details US $128.00 |
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Philips ECG 12AT7 8813 Amplifier Amp Preamp Vacuum Tube See Full Details US $1.99 |
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Fisher 202-T Tube Stero AM/FM Tuner Preamp Working See Full Details US $146.50 |
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Rare Vintage Pioneer SX-2000 TUBE Amp / Receiver 1968 See Full Details US $78.77 |
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Lot 2 12AT7 8803 Amplifier Amp Preamp Vacuum Tubes Pair See Full Details US $1.99 |
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Valvo PCC88 (2x) See Full Details US $9.99 |
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Lot of 2 Sylvania RCA 6L6 6L6G radio amp tubes See Full Details US $9.99 |
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Excellent Pair RCA 6F6 Metal Power Amp. Pentode Tubes See Full Details US $9.95 |
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NOS NIB Pair RCA 6V6GT Smoked Glass Tubes for Tweed Amp See Full Details US $35.50 |
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Old Quad QCII tube mic pre-amp phono tape mixer vintage See Full Details US $9.99 |
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National Union 5Y3 GT Radio Amp Vacuum Tube NOS 1951 See Full Details US $9.95 |
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Realistic 7189A Tubes For Magnatone EL84 On Steroids See Full Details US $19.49 |
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6SN7WGT Sylvania (2x) Chrome top See Full Details US $23.65 |
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Excellent Pair Sylvania 12AU7WA ECC82 Pre-Amp Tubes See Full Details US $14.95 |
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Citation I Preamp AND Citation II Amp Harman Kardon set See Full Details US $2,648.00 |
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2 Dynaco ST-80 Amps, 1 Dynaco PAT-4 -Fully ReCap'd See Full Details US $150.00 |
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1957 Bogan Amplifier CHA 10 Recapped & Works Fine See Full Details US $49.99 |
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Matched Pair of National Union 6SL7GT Tubes NOS NIB See Full Details US $9.99 |
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2 RCA 12AU7 VACTUBE FOR GTR AMPS TESTS STRONG See Full Details US $5.00 |
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FAMOUS MARANTZ 16 SIXTEEN DUAL MONO POWER AMPLIFIER USA See Full Details US $450.00 |
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VINTAGE AMPEX 6516 TUBE AMP AMPLIFIER MONO THEATRE See Full Details US $132.50 |
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Vintage Bell PA Carillon Tube Amp Amplifier System See Full Details US $32.00 |
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2 Western Electric / Langevin 128A Tube Amplifiers ! ! See Full Details US $2,999.00 |
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1 ADMIRAL 1 NA 12AX7 VACTUBES GTRAMPS TST 72/72-72/72 See Full Details US $7.00 |
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Excellent The Fisher 7025 Super 12AX7 Pre-Amp Tube See Full Details US $16.95 |
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Vintage McIntosh MC60 MC 60 Tube Power amp+C104 Preamp See Full Details US $925.00 |
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2 FM CO 6V6GT SMKD GLASS VACTUBES FOR GTR AMPS TSTS GD See Full Details US $7.00 |
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DeForest training manual tube amps mics speakers phono See Full Details US $0.99 |
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Telefunken ECC83 12AX7 Radio Amp Tube Halo NOS 1962 See Full Details US $36.00 |
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general electric fullrange 12" speakers tube audio See Full Details US $9.99 |
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1 IEC 12AT7/ECC81 BRIT VACTUBE GTR AMPS MATCHED 76/76 See Full Details US $6.00 |
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magnavox 5" alnico tweeter pair tube amp See Full Details US $9.99 |
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