1625=VT-136 National Union used/good mid-1940”s (69/40)

JAN-CNU-1625=VT-136 National Union used/good mid-1940”s

69/40

40=65%

(1625=807 with 12.6V @ 450ma filament and 7 pin base, common in WWII Transmitters)

– ELKIN linear amp