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Mullard 12AX7 / ECC83 - matched pair, Amperex label, phono grade

Mullard 12AX7 / ECC83 - matched pair, Amperex label, phono grade
Price: $197.00
1 matched pair in stock
Item Number: 685AMP
Manufacturer: Mullard
Description

The 1970s Mullard 12AX7 / ECC83 tubes in this precisely matched pair have
short gray plates and halo getters (I63 series). The orange print on the glass has the Amperex logo and reads "Made in Great Britain." The Blackburn, UK factory code is etched in the glass for both tubes.
 
Testing

Both tubes test as new.
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—on our custom noise testing equipment. They are an excellent choice for sensitive applications such as phono stages, V1 positions, microphone preamps, and DA converters.

 
Pricing

These tubes are sold as a matched pair. Tubes ship in new white boxes with test results. Photo is of the actual tubes. Singles, when available, are listed as Item 330.
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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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