Quote:
Originally Posted by MadMan
So like... they'd sell you a kit to make a 67.5 v power supply, so that you could actually use the portable radio on plug-in power? Heh, but you still had to power the filaments with flashlight batteries? lol But hey, I guess the filament circuit is a lot more temperamental, probably would be an expensive kit that nobody would buy.
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It wasn't a kit, it was a project in an electronics magazine. I bought the parts at Olsons and built it into a plastic box. It worked fine, but the radio became a hot chassis.
Back in the 1950's high capacitance, low voltage Electrolytics weren't that common, so it would be too costly to build an "A" supply with little or no hum.