Tube 16AQ3 or Röhre 16AQ3 ID5509, Damper, booster, flyback diode, Noval, 9 pin miniature (USA pico-9) B9A and shown. Radio tubes are valves.
16AQ3. Booster diode for use in line-timebase circuits of trans- formerless ... TUBE OUTLINE max 8". JULY 1959 max 34" max 3½". M3631 coated, unipotential. E9 ...