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1 X KTW63 / 8K7G TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: MARCONI WIRELESS TELEGRAPH. 1950s PRODUCTION.
BLACK PLATES.
TESTED IN ROEHRENTEST TUBE TESTER:
99% 6.904mA EMISSION (EM) 1.27mA/V TRANSCONDUCTANCE (GM)
CH167U1