B65 MARCONI BADGED 6SN7GT CV1988 CLEAR GLASS FAT BROWN BASE WHITE PRINT  MADE OCTOBER 1960
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B65 MARCONI BADGED 6SN7GT CV1988 CLEAR GLASS FAT BROWN BASE WHITE PRINT  MADE OCTOBER 1960 B65 MARCONI BADGED 6SN7GT CV1988 CLEAR GLASS FAT BROWN BASE WHITE PRINT  MADE OCTOBER 1960

B65 MARCONI BADGED 6SN7GT CV1988 CLEAR GLASS FAT BROWN BASE WHITE PRINT MADE OCTOBER 1960

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B65 MARCONI BADGED 6SN7GT CLEAR GLASS FAT BROWN BASE WHITE PRINT  MADE OCTOBER 1960
This device carries the Marconi labelling along with B65 notation, the envelope also carries a date code for October 1960.   The obverse of the valve carries the CV1988 notation too indicating that this valve was destined for military usage - hardly surprising with the low loss brown micanol base.
This device shows good emission and superb matching for each triode section within each envelope - a hallmark of a good valve. 

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