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B339, MARCONIPHONE BADGED , MULLARD, ECC83, mC1 B7C, BLACKBURN MANUFACTURED  1957
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B339, MARCONIPHONE BADGED , MULLARD, ECC83, mC1 B7C, BLACKBURN MANUFACTURED  1957 B339, MARCONIPHONE BADGED , MULLARD, ECC83, mC1 B7C, BLACKBURN MANUFACTURED  1957

B339, MARCONIPHONE BADGED , MULLARD, ECC83, mC1 B7C, BLACKBURN MANUFACTURED 1957

  • £120.00

Only 1 left!

B339, MARCONIPHONE BADGED , MULLARD, ECC83, mC1 B7C, BLACKBURN MANUFACTURED  1957

On offer today we have a Marconiphone white print B339 carrying a date code for 1957. 

For Va = 250 V Vg = -2.0V against a nominal specification of anode current Ia = 1.2 mA and mutual conductance gm = 1.6 mA/V, the following results were obtained:-

A1 Ia = 1.3 mA gm = 1.5 mA/V

A2 Ia = 1.3 mA gm = 1.6 mA/V

As you can appreciate this represents good matching of each triode section within the envelope and a device showing superb emission.


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