Browse Categories

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

12AX7 / 12AX7A / ECC83 Pre-war Yugoslavia - premium matched pair
Price: $129.00
2 in stock
Item Number: 701
Manufacturer: Ei

The Ei ECC83 / 12AX7 tubes in this precisely matched pair were made in pre-war Yugoslavia and labeled for other companies (Audio Research Corporation, RCA, Raytheon, etc.). They have smooth gray plates and halo getters, just like the famed Telefunken 12AX7 tubes they was modeled after—at a fraction of the price! The white labels says "made in W. Germany" but the code etched in the glass is for the Ei factory in Yugoslavia.

Both tubes test as new and are matched for both current draw (mA) and transconductance (Gm). They have been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics on each triode section. They were 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

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.


These tubes are sold as a matched pair (2 tubes) Singles, when available, are listed as Item 701. They ship in new white boxes with test results for each section.

Related Products

Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia
Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia
Price: $59.00
Ei 12AX7 / ECC83 - smooth plates, pre-war Yugoslavia
This Ei ECC83 / 12AX7 tube was made in pre-war Yugoslavia and labeled for other companies. It has smooth gray plates and a halo getter, just like the famed Telefunken 12AX7 tube it was modeled after. Tube tests as new with phono grade noise levels.
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.

Shopping Cart
Your cart is empty.