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2 X 403A / 6AK5 TUBE. USED.
BRAND: WESTERN ELECTRIC. 1950s PRODUCTION.
BLACK PLATES, RECTANGULAR GETTER.
TESTED IN ROEHRENTEST TUBE TESTER:
98% 7.582mA EMISSION (EM) 5.1mA/V TRANSCONDUCTANCE (GM)
70% 5.385mA EMISSION (EM) 3.59mA/V TRANSCONDUCTANCE (GM)
CH168U1