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1 X ECC83 / 12AX7 TUBE. USED.
BRAND: VALVO. 1960s PHILIPS PRODUCTION.
GREY PLATES, HALO GETTER.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 0.7mA
1.1/1.3mA EMISSION (EM)
CH166U1