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Telefunken 12AX7 / ECC83 - smooth plates, various labels

Telefunken 12AX7 / ECC83 - smooth plates, diamond imprint, OEM
Price: From $37.00 to $109.00
Manufacturer: Telefunken

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Test Results:

This 1960s Telefunken ECC83 / 12AX7 has smooth gray plates and a diamond imprint on the base. The white print on the glass is labeled for other companies (Fisher, Dynaco, Silvertone, etc) and says "Made in Western Germany" (label may be partial).

Don't miss this opportunity to hear one of the best sounding—and hardest to find—12AX7s ever made!

This tube 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.
See product options for current availability.

Noise and microphonics

Tubes that test as "phono grade" are 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, 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). Photo is a sample from the lot. Matched sets, when available, are listed as Item 613.
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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