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2 X EL506 TUBE. USED.
BRAND: BRIMAR. 1960s PRODUCTION.
GREY PLATES, HALO GETTER, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
82% 49.46mA EMISSION (EM) 10.13mA/V TRANSCONDUCTANCE (GM)
93% 55.61mA EMISSION (EM) 10.63mA/V TRANSCONDUCTANCE (GM)
CH168U1