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1 X ECC83 / 12AX7 TUBE. USED.
BRAND: PHILIPS. 1960s MULLARD PRODUCTION. B4H3 DATE CODES.
GREY PLATES, HALO GETTER.
TESTED IN ROEHRENTEST TUBE TESTER:
182/89% 2.179/1.002mA EMISSION (EM)
CH168U1