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12AT7, Zaerix Badged, National Union, ECC81, EIA CODE 274, BOXED, NEW
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12AT7, Zaerix Badged, National Union, ECC81, EIA CODE 274, BOXED, NEW 12AT7, Zaerix Badged, National Union, ECC81, EIA CODE 274, BOXED, NEW 12AT7, Zaerix Badged, National Union, ECC81, EIA CODE 274, BOXED, NEW

12AT7, Zaerix Badged, National Union, ECC81, EIA CODE 274, BOXED, NEW

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12AT7, ZAERIX BADGED, NATIONAL UNION, ECC81,  EIA CODE 274

On offer today is a lovely ZAERIX badged, National Union  12AT7, a premium quality ECC81 carrying the etched EIA code 274.       Carrying good white print, it tests as excellent using my AVO Valve Characteristic Meter VCM163 with the following results: At Va = 250V Vg = -2.0V 

Section 1: Ia = 14.4 mA; gm = 6.0 mA/V

Section 2: Ia = 16.0 mA; gm = 6.0 mA/V

The specification for a new/100% emission valve is:

Ia = 10 mA; gm = 5.5 mA/V

As you can see, this result show a strong valve with excellent matching of each triode section within the envelope.

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