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B309, ECC81, MARCONI, BRITISH MADE, 1961 PRODUCTION
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B309, ECC81, MARCONI, BRITISH MADE, 1961 PRODUCTION B309, ECC81, MARCONI, BRITISH MADE, 1961 PRODUCTION

B309, ECC81, MARCONI, BRITISH MADE, 1961 PRODUCTION

  • £37.00

Only 1 left!

B309, ECC81, MARCONI, BRITISH MADE, 1961 PRODUCTION

On offer today is a lovely Marconi B309, 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 = 10 mA; gm = 4.8 mA/V

Section 2: Ia = 10 mA; gm = 4.8 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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