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Genalex GEC 12AT7 / A2900 - black plates, matched pair
 Genalex GEC 12AT7 / A2900 - black plates, matched pair Genalex GEC 12AT7 / A2900 - black plates, matched pair |
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1 matched pair in stock
Item Number: 1023
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Description
The 1978 GEC A2900 tubes in this matched pair are a premium quality Genalex 12AT7 tube type. They were made in England by the Marconi-Osram Valve Company (MOV). They have wide black plates and large halo getters. The glass has tan decals with the Genalex logo.
Test Results
These tubes are screened for
gas, heater-cathode leakage, shorts, and excessive noise and
microphonics. They are tested at typical operating voltages on a
laboratory grade Amplitrex AT1000 (manual setting, fixed bias mode). Learn more about our testing process here.
Both tubes test as new and are matched for both current draw (mA) and transconductance (Gm). The test results for each tube are listed below.
Tube 1
Date code: 7847 Z (1978)
iP: 10.2 mA (102%) & 11.2 mA (112%)
Gm: 6400 (116%) & 6600 (120%)
Noise/microphonics: Quiet both sections
Tube 2
Date code: 7848 Z (1978)
iP: 10.2 mA (102%) & 10.4 mA (104%)
Gm: 6200 (112%) & 6400 (116%)
Noise/microphonics: Quiet both sections
Tube ships in new white boxes with test results for current draw (mA) and transconductance (Gm) for each section.
Pricing
These tubes are sold as a matched pair. Photos are of the actual tubes. Singles, when available, are listed as Item 1023.
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This late 1970s GEC A2900 tube is a premium quality Genalex 12AT7 tube type. It was made in England by the Marconi-Osram Valve Company (MOV). It has wide black plates and a large halo getter. Click "more info" for test results and current availability.
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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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