A VERY NICE AND STRONG PAIR OF 60s MULLARD 12AX7 / ECC83.
MADE IN THE BLACKBURN FACTORY IN ENGLAND FOR PHILIPS
LOGO IS WORN ON ONE TUBE BUT THE TUBES MEASURE GREAT AND A GOOD MATCH..
TESTED ON A GREAT HICKOCK 539 C,WHERE 875 MICROHMOS IS MINIMUM GOOD.

TUBE 1 = 1350/1400 MICROHMOS
TUBE 2= 1400/1400 MICROHMOS
CODES 163 BC32 & 163 & ?
SECOND TUBE'S B-CODE HAS BEEN WORN OFF, BUT
YOU CAN TELL THEY ARE FROM THE SAME BATCH.

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