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Mullard 12AX7 / ECC83 - f92 series, long plates, matched pair

Mullard 12AX7 / ECC83 - f92 series, long plates, matched pair
Mullard 12AX7 / ECC83 - f92 series, long plates, matched pairMullard 12AX7 / ECC83 - f92 series, long plates, matched pair
Price: $324.00
1 matched pairs in stock
Item Number: 947_PR
Manufacturer: Mullard
Description

The rare 1958 Mullard 12AX7 / ECC83 tubes in this precisely matched pair have 17mm long plates with copper grid posts and halo getters with dual supports (f92 series). The white labels on the glass have the Mullard shield logos and read "made in Gt Britain." The Blackburn factory codes and matching date codes (B8L = 1958) are etched in the glass 

Testing

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

 
Pricing

These tubes are sold as a matched pair.
They ship in new white boxes with test results for each triode section. Photos are of the actual tubes. Singles, when available, are listed as Item 947.
 

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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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