Philco 20, 21, 90 or what?

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Samlex heavy-Duty bench supply filter question
I suggest sticking with the original values. Depending upon the design if you increase the cap values too much the incre...DaleHCook — 08:55 AM
AC/DC Transformer-less Sets
You’re welcome! I was born in 1995, so this is all second-hand information to me from the industry. I did some research ...jrblasde — 08:38 AM
Samlex heavy-Duty bench supply filter question
Hello Everyone, I have one of my Heavy-duty bench powersuplies made by Samlex it's 13.8 volt dc 20-25 amp supply. What I...radiorich — 11:24 PM
Looking for place to donate unique Philco Philco J-1930 Prototype
It's a Glaser Sears changer which Philco's engineers thought was an upgrade over a VM, but in retrospect I'd prefer the ...jeibner — 10:39 PM
AC/DC Transformer-less Sets
Joseph, Thank you for the confirmation. I knew that there must be more to the Transformer-less AC/DC radios than the ...PeterN — 10:30 PM
AC/DC Transformer-less Sets
Good evening, folks. Power station engineer here! The east coast had pockets of DC-only power well into the twentieth...jrblasde — 10:11 PM
AC/DC Transformer-less Sets
Model 40 does not have a rectifier, so it would be a DC only model. This however does not say anything about using...morzh — 08:01 PM
AC/DC Transformer-less Sets
I was wondering if anyone knows if these AC/DC transformer-less sets were actually used on 110v DC anywhere, and when. ...PeterN — 06:35 PM
Looking for place to donate unique Philco Philco J-1930 Prototype
Given the 1960s vintage, it is likely that the cartridge is ceramic, likely more stable. The changer looks like a Voice...MrFixr55 — 05:03 PM
Jackson 665 j2 schematic request
FIXED!daveone23 — 03:55 PM

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