12AT7, ECC81, BRIMAR,Large Font, Footscray June 1956 Production

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12AT7, ECC81, BRIMAR,Large Font, Footscray June 1956 Production

£32.00

12AT7, ECC81, BRIMAR, LARGE FONT, FOOTSCRAY JUNE 1956 PRODUCTION

On offer today is a lovely Brimar 12AT7, a premium quality ECC81 carrying the date code for June 1956. 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 = 12 mA; gm = 7 mA/V

Section 2: Ia = 15 mA; gm = 7 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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