Osram valve circuits (1939)

 

1: 2 volt battery, 3 valve receiver, pentode detector with automatic grid bias

2: 3-7 metre receiver (suitable for TV sound)

3: Typical 2 volt Battery Double Diode-Triode to provide Detection and A.V.C

4: A typical TRF receiver using a double diode triode detector/AGC

5: Circuit using 'Magic Eye' Tuneray display in a double-diode detection circuit

6: Circuit using 'Magic-eye'  for correct tuning in Superhet receiver

7: Typical circuit for a 2 Osram KT61 high slope output triodes in push-pull

8: Typical circuit for a DC or DC/AC using KT33C vales in push-pull

9: Typical Circuit for amplifier using AC mains with Osram KT66 valves as Triodes in push-pull )also suitable for a modulator in transmitter (on circuit 11)

10: Typical circuit for two Osram KT66 output power Tetrodes in push-pull, with negative feedback

11: Typical circuit illustrating Osram KT8 as anode modulated 'Class C' Amplifier, suitable for output of a 20 watts at wavelengths down to 20 metres

12: Typical Circuit for a 'Deaf Aid' amplifier using Osram Midget Valves