Power Supply for battery receivers
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To operate those battery receivers from the 20ies a power supply has to be used.
First I decided to build a power supply based on the type 1V single-wave rectifier tube. 1V is indirected heated and using the UX-4 socket. Heater current is 0.3A at 6.3V. The tube can deliver up to 50mA DC which is fair enough for the old battery receivers.
So I used the 1V rectifier tube for the anode voltages (B), and a Si-rectification and a 2N3055 transistor for the heater voltage (A). At last the grid voltages (C): simplest method is to use small batteries.
A mahogany case with a pertinax plate on top gives the complete PS a very nice look.
Later, after building another power supply for the french Evernice E4 receiver using the double-wave rectifier tube 1274 in a hybrid Graetz bridge, I changed also this power supply. So socket and rectifier were replaced, an octal socket and a 1274 came in, and 2 diodes type SY 330/15 completed the full-wave bridge.
