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RCA 12AX7A - short gray plates, phono grade

RCA 12AX7 / 12AX7A - gray plates, halo getter
Price: From $22.00 to $79.00
Manufacturer: RCA

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Test Results:
Description

This 1960s RCA 12AX7A tube has short gray plates and a halo getter. The red print on the glass has the RCA logo (partial / missing).
 
Testing

This tube has been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics on each triode section. It was tested at typical operating voltages on a laboratory grade Amplitrex AT1000 (manual setting, fixed bias mode). Learn more about our testing process here. See product options for current availability.

Noise and microphonics

Tubes that test as “phono grade” are 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, DA converters, and phono stages.

Pricing

This tube is sold individually. It ships in a new white box with test results for current draw (mA) and transconductance (Gm). Photo is a sample from the lot.
Matched pairs, when available, are listed as Item 631.

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This early 1960s RCA 12AX7 tube has long gray plates and a D getter. Click "more info" for current availability.
RCA 12AX7A - short gray plates, phono grade, matched pair
RCA 12AX7A - short gray plates, phono grade, matched pair
Price: $169.00
RCA 12AX7A - short gray plates, phono grade, matched pair
The 1960s RCA 12AX7A tubes in this precisely matched pair have short gray plates and halo getters. The red labels on the glass have the RCA logo (partial / missing). Both tubes test as new with phono grade noise levels.
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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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