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Sylvania 12AX7 - long gray plates, mil spec, phono grade
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1 in stock
Item Number: 312
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Description
This 1961 military spec Sylvania 12AX7 tube has long gray plates with copper grid posts and a halo getter. The green print on the glass reads "JHS 12AX7."
Testing
This tube tests as new. It 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.
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).
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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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