AUDIO VALVES: ECC83 12AX7 CV4004 CV492 B339 M8137 6057 VX7059 TWIN TRIODE
The most versatile B9A twin-triode valve in history saw the commercial light of day during early 1948. Developed by R.C.A at their Harrison, New Jersey facility in the USA. At it's introduction, it was heralded as the first twin-triode device engineered for high gain, low noise applications. This versatility represented vast business and the giant Philip - Mullard conglomerate watched from the wings awaiting a slice of the action!!
Philips tasked it's famous R&D department to work with the goal to develop the best ECC83/12AX7 type made. Almost obsessive detail to control grid windings, electrode metallurgy quality control and enhancement of cathode emissive materials achieved during the 1950's resulted in the much feted Mullard ECC83.
The ECC83 high impedance amplifier triode was designed specifically for audio use and has a high amplification factor of 100. Mullard describe the ECC83 as a high mu double triode, having separate cathodes, primarily intended for use as a resistance-coupled amplifier or phase inverter. Physical dimensions for the ECC83 are as stated: - envelope of 21 mm diameter and of thin glass wall construction.
This valve type is extensively used in today’s designs of hi-fi audio amplifiers in very much the same way as they found use in the Mullard and other classic audio amplification designs of the 1950s and 1960s with the valve's two triode sections being used as second stage amplification and cathode coupled phase splitter - the phase splitter being required so that the push-pull output stage was driven correctly, the following list gives you a taste of the range of exotica old and new that uses the ECC83:-
Aestenix Calypso
Aestetix Rhea phono
Allen Sweet Spot 2008
Art Audio MPA Gold pre
Art Audio phono
Art Pro Audio MPA
ART MPA Gold 2 Channel Microphone Preamp
Audio Research linestage
Audio Thrills phono
Bad Cat 'Custom Shop' Cub II R 1 x 12 Combo Tube Amplifier
Behringer T1953 Tube Ultragain Dual Microphone Preamp
Behringer T1954 Ultrafex
Belari 129 phono
Bellari VP130 phono
Blackstar HT-5
Bogner Ecstasy
Broskie Aikido PH1
CAT JL2 amp
CAT SL-1 Signature Mark III preamp
Cementer Amplification TB - 2b Tube Direct box
Conrad Johnson Premier 15 phono preamp
Conrad Johnson MV60SE
Diezel Herbert head
Dumble Overdrive Special clone amp
EAR 834P
EAR 864
Fender 57 Champ Reissue
Fender Deluxe Reverb 1964
Fender Princeton Reverb
Fender '64 Vibroverb,
Fender Pro Reverb 1967
Fender Twin Reverb 1990
George Wright phono
Germino Club 40
Gibson GA-6 1957
Goodsell Super 17 M.K. 2 head
Heritage Colonial 50W
Jadis preamp
Jolida 1000 CD player
Landgraff Custom 50W
Lexicon Signature 284
Magnum Dynalab MD108 tuner
Marshall 1959HW Plexi
McIntosh MX10
Mesa Boogie Mark 2C+
Mesa Boogie Triaxis 2 preamp
Nagra PL-L preamp
Nagra PL-P
ORANGE AD30HTC
Prima Luna
Rogers High Fidelity EHF-100 2011
Rogue Cronus
Rogue Tempest Int.
Shanling CD-S100SE HDCD player
Shindo linestage
Soldano SLO-100
SUPRO model # 1616T
Swart Amps Atomic Space Tone
Teletronix LA-2A Compressor/Limiter
THOR phono stage
Top Hat King Royale
Torres Engineering Boogie Mite
Trace Elliot C30
Two-Rock Custom Reverb Signature V1
UESUGI TAE-4 phono 2008
Universal 175
Victoria Regal 2007
Vincent CD-S6 CD Player
VOX AC15
Pilot SP-210 preamp
THD Plexi-50
Tubetech CL1B
Veloce Audio Line Stage and Phono Amp
VTL 7.5 preamp
