Browse Categories

Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia

Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia
Price: From $15.00 to $49.00
Manufacturer: Ei

Product Options


This Ei ECC83 / 12AX7 tube was made in pre-war Yugoslavia and labeled for other companies (Audio Research Corporation, RCA, Raytheon, etc.). It has smooth gray plates and a halo getter, just like the famed Telefunken 12AX7 tube it was modeled after--at a fraction of the cost! The white labels says "made in W. Germany" but the code etched in the glass is for the Ei factory in Yugoslavia.

This tube tests as new. 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. 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. They are 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 701.

Related Products

12AX7 / 12AX7A / ECC83 Pre-war Yugoslavia - premium matched pair
Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia, matched sets
Price: From $36.00 to $92.00
Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia, matched sets
The Ei ECC83 / 12AX7 tubes in these precisely matched pairs, trios, quads, and sextets were made in pre-war Yugoslavia and labeled for Audio Research. They have smooth gray plates, just like the famed Telefunken 12AX7 tubes they were modeled after.
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.

Orders received
June 16-24 will
ship June 25-27

Shopping Cart
Your cart is empty.