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A good source for an inexpensive Isolated Variable AC Power Supply
Hello everyone, I've been trying to look up an inexpensive (under $50) Isolated Variable AC Power Supply (like the one that Shango066 uses in his Videos or like the Heathkit one that Radiotvphononut uses in his videos) and I've not found anything so far, and what ones I have found they wanted over $300 or more for them and some ridiculuous amount for shipping costs that brings the cost to almost $800.
The reason why I ask is that I have a 1947 vintage Westinghouse AM/FM Bakelite Tabletop radio thats an AA6 set that is receiving absolutely no signal whatsoever on either AM or FM and I want to try and hook my signal generator up to it to check the front end out on the radio but since I don't have an isolated power supply to hook the radio up to, I dare not try and work on that radio right now otherwise I might fry my test gear and I don't want to fry my signal generator. Anyone on here have any suggestions for a good isolated variable AC power supply that I could use to plug my series string radios into for troubleshooting purposes? Thanks for your help. |
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https://www.ebay.com/c/1020961952 With that I could just hook a Powerstat variac up to the 115 or 125 volt power outlet (one of those older ungrounded ones) and then I'd have my isolated Variable power supply. It would be less than $50 (for the transformer anyways), and then getting the variac would be another $75 on top of that (buying at a different time). |
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I just bought it, it cost me a little more than what I would of liked to of paid for one but not much, it came out to around $66 and some change after tax and shipping costs factored in, which is much more reasonable that the $200-$300 that some sellers were asking for them.
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Audiokarma |
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Awesome !!!! post up some pics when it arrives
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Alright will do. It will probably be about a week or so.
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That transformer is only rated for 15 watts, it would be undersized with a AA6 radio, i think a AA5 is around 50-ish watts.
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This one is not the exact one that was listed in that link earlier , but it looks very similar to the one that vortalexfan bought (except that vortalexfan's one has three power outlets VS the single one seen on this transformer) Last edited by init4fun; 09-03-2020 at 05:15 AM. |
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That old Stancor looks fantastic for almost any radio, for a TV you need about 300 watts and color TV 400 watts minimum.
I found this Halldorson 500 VA with tap switches. I still use an oversized powerstat that was liberated from a theatrical lighting dimmer, in line before it rather than risk a mechanical failure of the switches, which are buried inside. The meter is pretty worthless accuracy wise. Halldorson-variable-Transformer-.jpg
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"When resistors increase in value, they're worthless" -Dave G |
Audiokarma |
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I read a voltage from the secondary to ground with a digital meter. I thought, maybe it was overheated and damaged. Checked with a Megger, primary to secondary, primary to core, secondary to core. All OK. I thought, using a digital meter was not the right decision, too sensitive! |
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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The one I got is a 350 Watt unit, (350 VA) with 3 different voltage tapped outlets, one for 105 VAC, one for 115 VAC and one for 125 VAC, the one you saw in the "link" was a different one because I already bought the unit that that link originally went to.
I have pictures of the unit I bought posted below because I just got it today in the mail. |
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Those 3-tap units are not easy to find, congratulations.
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"When resistors increase in value, they're worthless" -Dave G |
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Thanks, it is a beast, weighs probably a good 40 lbs. or so.
And it does work! |
Audiokarma |
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