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2 X 5687 TUNG-SOL TUBE. 1950s PROD. BLACK PLATES D GETTER TUBE. MATCHED PAIR NOS.
TESTED IN AMPLITREX AT1000 TUBE TESTER:
93/103% EMISSION (EM) 889/103% TRANSCONDUCTANCE (GM) 0.6/0.8mA/V GAS
86/115% EMISSION (EM) 88/107% TRANSCONDUCTANCE (GM) 0.4/0.8mA/V GAS
RCB44V16