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Mullard 12AX7 / ECC83 - matched pair, I61 series, phono grade

Mullard 12AX7 / ECC83 - matched pair, I61 series
Mullard 12AX7 / ECC83 - matched pair, I61 series
Price: $194.00
2 matched pair in stock
Item Number: 685I61
Manufacturer: Mullard
Description

The 1961 Mullard 12AX7 / ECC83 tubes in this precisely matched pair have halo getters and gray plates with copper grid posts
(I61 series). The red print on the glass is labeled for 3M Revere Wollensak. The Blackburn, UK factory codes 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/V1 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 a sample from the lot. Singles, when available, are listed as Item 330.

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Mullard 12AX7 / ECC83 - various labels, phono grade, I61 series
This 1963 Mullard 12AX7 / ECC83 tube has short gray plates with copper grid posts and a halo getter (I61 series). The red label has the 3M logo and the Blackburn, UK factory code is etched in the glass. Tube tests as new with phono grade noise.
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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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