This circuit was found in a documentation from 1948. There are 5 valves with push-pull output. The source uses a transformer, and the indicated application is with turntables.
This circuit works only with carbon microphones, due its low impedance. The speaker should be good or...
This preamplifier is intended for the use with magnetic pick-ups. Power supply must have voltages...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...