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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


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


Pilot SP-210 preamp

THD Plexi-50

Tubetech CL1B

Veloce Audio Line Stage and Phono Amp

VTL 7.5 preamp


 cv4004 12ax7 ecc83