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2 X 10Y / VT25 TUBE. NEW OLD STOCK.
BRAND: SYLVANIA. 1950s PRODUCTION.
BLACK PLATES, FLAT GETTER, MATCHED PAIR.
TESTED IN ROEHRENTEST TUBE TESTER:
88% 8.772mA EMISSION (EM) 1.46mA/V TRANSCONDUCTANCE (GM)
90% 9.042mA EMISSION (EM) 1.39mA/V TRANSCONDUCTANCE (GM)
CH164U1