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Telefunken 12AX7 / ECC83 - smooth plates, matched pair, Dynaco labels

Telefunken 12AX7 / ECC83 - matched pair
Price: $249.00
1 matched pairs in stock
Item Number: 617DY
Manufacturer: Telefunken

The 1964–65 Telefunken 12AX7 / ECC83 tubes in this precisely matched pair have smooth plates and halo getters. The white print on the glass is labeled for
Dynaco with matching date codes and says “Made in West Germany.” The tube bases have the Telefunken diamond imprints stamped in them.

These tubes test as new with balanced sections.
They are precisely 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

These tubes test as “phono grade”—the quietest range for noise and microphonics levels—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.
Singles, when available, are listed as Item 31. They ship in new white boxes with test results for current draw (mA) and transconductance (Gm).

More matched pairs are available. Contact us.

Related Products

Telefunken 12AX7 / ECC83 - ribbed plates, matched pair
Telefunken 12AX7 / ECC83 - ribbed plates, phono grade, matched pair
Price: $229.00
Telefunken 12AX7 / ECC83 - ribbed plates, phono grade, matched pair
The 1961 Telefunken 12AX7 / ECC83 tubes in this precisely matched pair have ribbed plates. The white labels have the Telefunken logo with matching date codes. The diamond imprint is stamped in the bases. Both tubes test as new with phono grade noise level
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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