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ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE
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ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE

ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE

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ECC81, MULLARD, OLD SHIELD, WHITE PRINT, FACTORY CODE, Tk3 B1J5, BLACKBURN 1961 MANUFACTURE

On offer today is a lovely Mullard ECC81, a premium quality ECC81 carrying the date code for 1961.       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 = 13 mA; gm = 4.3 mA/V

Section 2: Ia = 11 mA; gm = 4.1mA/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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