Just picked up a 1930s Battery operated Coronado

[vortalexfan]

Originally Posted by dieseljeep

I've been following this thread from the very beginning. I would knock together a simple B+ supply using a silicon rectifier or bridge rectifier, two 20mfd electrolytics , 2200ohm, 1 watt resistor and 180 ohm, 1 watt before the rectifier.
Once you get all the problems straightened out, you can go back to using battery power.
I built one 65 years ago because of the high cost of "B" batteries.
Flashlite cells were only 15 to 25 cents at the time.

I think what caused the faulty 9V battery in my "B" Supply was that I had taken this Radio over to my parents house last week to demonstrate the radio to them, and when I went to load the radio back into my car the "B" supply battery pack fell out of the back of my radio and landed on the ground which was covered in snow and I think that caused the battery to "short out".