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1 X 5687 TUBE. NEW OLD STOCK IN ORIGINAL BOX.
BRAND: TUNG-SOL. 1950s PRODUCTION.
17MM BLACK PLATES, D-GETTER, COPPERR RODS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
153/99% EMISSION (EM) 122/96% TRANSCONDUCTANCE (GM) 0.4/0.4mA/V GAS
CH166U1