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Mullard 12AX7 / ECC83 - f91 series, long plates


Price: $184.00
1 in stock
Item Number: 223SQ
Manufacturer: Mullard
Description

This very rare 1958 Mullard 12AX7 / ECC83 tube has 17mm long plates with copper grid posts (f91 series). It has a dual post square getter like the earlier mC1 series. The white print on the glass has the Mullard label and reads "made in Gt. Britain." The Blackburn factory code is etched in the glass.

Testing

Tube tests as new with precisely balanced sections and very low noise. It has been tested at typical operating voltages on a laboratory grade Amplitrex AT1000 (manual setting, fixed bias mode). It has also been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics. Learn more about our testing process here

Pricing

This tube is sold individually. It ships in a new white box with test results for current draw (mA) and transconductance (Gm) for each triode section. Photo is of the actual tube. 

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Mullard 12AX7 / ECC83 - f91 series, long plates
Mullard 12AX7 / ECC83 - f91 series, long plates, Heath label
Price: $169.00
Mullard 12AX7 / ECC83 - f91 series, long plates, Heath label
This rare 1958 Mullard 12AX7 / ECC83 tube has 17mm long plates with copper grid posts and a dual post halo getter (f91 series). The white print has the Heath logo. Tube tests as new with balanced sections and 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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