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2 X 6SL7GT SYLVANIA TUBE. NEW OLD STOCK.
BRAND: SYLVANIA. 1940's PRODUCTION.
BLACK ROUND STAGGERED PLATES.
LEFT TUBE IN THE PICTURE, IT HAS RECTANGULAR GETTER. RIGHT TUBE, IT HAS SOLID GETTER.
TESTED IN ROEHRENTEST TUBE TESTER:
93/92% mA EMISSION (EM) 1.78/1.76mA/V TRANSCONDUCTANCE (GM)
81/88% mA EMISSION (EM) 1.34/1.4mA/V TRANSCONDUCTANCE (GM)
