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Mullard 12AX7 / ECC83 - various labels, phono grade, 1970s

Mullard 12AX7 / ECC83 - various labels, phono grade
Price: $89.00
1 in stock
Item Number: 330
Manufacturer: Mullard

This 1970s Mullard 12AX7 / ECC83 tube has short gray plates and a halo getter (I63 series). The orange print on the glass has the Amperex logo and says "Made in Great Britain." The Blackburn, UK factory code is etched in the glass.


This tube tests as new with balanced sections. It has been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics on each triode section. It was tested at typical operating voltages on a laboratory grade Amplitrex AT1000 (manual setting, fixed bias mode). 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.
Photo is a sample from the lot.

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Mullard 12AX7 / ECC83 - matched pair, Amperex label, phono grade
Mullard 12AX7 / ECC83 - matched pair, Amperex label, phono grade
Price: $184.00
Mullard 12AX7 / ECC83 - matched pair, Amperex label, phono grade
The 1970s Mullard 12AX7 / ECC83 tubes in this precisely matched pair have short gray plates and halo getters (I63 series). The orange labels have the Amperex logo and the Blackburn, UK factory codes are etched in the glass. Click "more info" for details.
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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