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2 X 6F6G MARCONI TUBE. 1948. NEW OLD STOCK IN ORIGINAL BOX. MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
77% mA EMISSION (EM) 26.11mA/V TRANSCONDUCTANCE (GM)
78% mA EMISSION (EM) 29.51mA/V TRANSCONDUCTANCE (GM)
RCB44