Philips model 292V, 1939 - 1940

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This was the most complex of two 6V battery powered Philips export market table radios offered in 1940. 

The chassis is virtually identical to that of the earlier 289BV type, and shares much with that of type 289A.  The audio circuit uses 2V battery type tubes as a means of minimizing heater current for the relatively large number of tubes.  A push-pull power amplifier using a double triode tube offers good output power yet low quiescent current.  The power supply uses a synchronous mechanical 6V chopper, with rectification effected by a second set of contacts.  Variable IF bandwidth and sensitivity are selectable.

This example has been equipped with a transistorized switching circuit to replace the mechanical chopper.