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1 X ECC40 TUBE. USED.
BRAND: MULLARD. 1950s PHILIPS PRODUCTION.
GREY PLATES, SOLID GETTER, COPPER RODS.
TESTED IN FUNKE W20 TUBE TESTER:
MINIMUM GOOD EMISSION = 60% = 5.4mA
6.6/7mA EMISSION (EM)
CH165U1