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Telefunken 12AX7 / ECC83 - ribbed plates, matched pair, phono grade

Telefunken 12AX7 / ECC83 - ribbed plates, matched pair
Price: $144.00
1 matched pair in stock
Item Number: 401
Manufacturer: Telefunken
Description

The 1959 Telefunken 12AX7 / ECC83 tubes in this precisely matched pair have ribbed plates and halo getters. The white labels on the glass have the Telefunken logo and t
he diamond imprints stamped in the bases.
 
Testing

These tubes test at 87-93% for transconductance (Gm).
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,
V1 positions in guitar amps, DA converters, and phono stages.
 
Pricing

These tubes are sold as a matched pair.
They ship in new white boxes with test results for current draw (mA) and transconductance (Gm). Photo is of the actual tubes. Singles, when available, are listed as Item 221 and 599.

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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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