Quote from: Windsong on July 27, 2026, 04:22:26 PMI can see you really know what you are talking about. My father was big into radios and had been part of the Signal Corps in the Army. He always had a hi-fi system with a reel-to-reel, and myriad radios (tube AM, AM/FM/SW, hybrids, transistors, etc.).3 standard batteries, AA, AAA, C, D wired in series will give you 4.5 volts. Which would work depends on the size of the space you have to fill.
He wasn't especially handy, mechanically, but he could solder, and trace faults, and he taught me the basics. Most of his knowledge was wasted on me at the time when I might have paid better attention, but I have recently gotten onto researching and timidly collecting tabletop tube radios. As long as one can still get tubes, and knows the basics, these old things will literally run forever. Now, if I can just figure out a good modern replacement for these 1920s 4.5 volt Ever-Ready batteries.