MULLARD ECC83 12AX7
TESTED DIGITAL TUBETESTER
BASING CHART = Ia 1.2 mA - S 1.6 mA/V
RESULTS = Ia 08/0.7 mA - S 1.1/1.0mA/V
LONG RIBBED GRAY PLATES, RING GETTER
SPECIAL MODEL LOW NOISE, LOW MICROPHONIC
CODE ON GLASS = f91 B8E
MADE IN BLACKBURN UK MAY 1958
IN NEW MULLARD PAPER BOX