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Mullard 12AX7 / ECC83 - long plates, dual post getter

Price: $179.00
1 in stock
Item Number: 223
Manufacturer: Mullard

This rare 1959 Mullard 12AX7 / ECC83 tube has 17mm long plates with copper grid posts and a dual post halo getter (f92 series). The white print on the glass has the Mullard early shield logo and reads "made in Great Britain." The Blackburn factory code is etched in the glass 


This tube tests as new with balanced sections. It has been tested at typical operating voltages on a laboratory grade Amplitrex AT1000 (manual setting, fixed bias mode). It has also been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics. Learn more about our testing process here.

Noise and microphonics

This tube tests as “phono grade”—the quietest range for noise and microphonics—on our custom noise testing equipment. It is an excellent choice for sensitive applications such as microphone preamps, V1 position in guitar amps, DA converters, and phono stages. 


This tube is sold individually. It ships in a new white box with test results for current draw (mA) and transconductance (Gm) for each triode section.
TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.

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