Just picked up a 1930s Battery operated Coronado

[vortalexfan]

Originally Posted by maxhifi

I like the cabinet!

Go to your local dollar store and get 10 9V tranaisistor radio batteries to use in series for B+, and some D cells for the filaments. The 9V batteries can be clipped together in series using their own terminals, and then the first and last ones can have wire leads with alligator clips soldered to them, which you can connect to the radio's power connector. For the A battery I'd use 2 D cells in parallel.

Before you apply power you may want to do a basic replacement of capacitors, especially any electrolytic capacitors, the AVC filter, and the audio grid coupling capacitors.

The reason these radios sound worse than normal radios, is the audio output stage is necessarily very low powered, so the speaker is designed for efficiency rather than sound quality. They can be okay though. I like yours because of the fancy grill design and late 30s deco cabinet.

How do you parallel "D" batteries? is it positive to positive or negative to negative?