POWER SUPPLIES - BoatAnchors Forum at eHam.net

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eHam.net Forum : BoatAnchors : POWER SUPPLIES

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POWER SUPPLIES	Reply
by RADIOFREEISRAEL on September 6, 2009	Mail this to a friend!
Greetings everyone, I am searching to buy a good used tube type variable/adjustable output power supply. 0-450 volts DC 100 milliamperes Standard filament voltages and currents. Sam

RE: POWER SUPPLIES	Reply
by KG8LB on October 7, 2009	Mail this to a friend!
Keep an eye on Ebay. They turn up there quite often. ...I know, they aren't giving them away there! Be patient you may get a chance to "steal" one that gets overlooked. Don't bid early, bid right at the auction ending.

RE: POWER SUPPLIES	Reply
by RADIOFREEISRAEL on October 7, 2009	Mail this to a friend!
Thank you KG8LB, I am searching at eBay and you are correct. Power supplies are not plentiful and the prices are rather high. We will stay there and try to get something as we go along. Sam

RE: POWER SUPPLIES	Reply
by KE3WD on October 8, 2009	Mail this to a friend!
Such can be a rather easy and relatively inexpensive design if done in solid state. Transformer with multi-tapped secondaries and bridge rectifier followed by large capacitor. Also, use of fullwave bridge or halfwave, center tapping the fullwave or not, one can derive different high tension voltages that way. Full variable at 100mA is even possible, with only a bti more expense. Certainly less than trying to do it with thermionic valves in this day and age. And DC is DC at that stage of the game.

RE: POWER SUPPLIES	Reply
by WX7G on October 10, 2009	Mail this to a friend!
Look on ebay for Heathkit HV power supplies. They will run you up to $200 for the later models. I have one and it works fine. They use two 6L6 tubes for the series pass element.

RE: POWER SUPPLIES	Reply
by RADIOFREEISRAEL on October 10, 2009	Mail this to a friend!
Hi, I am considering making my own PS but I am a type of person that starts with a project and keeps on "adding" goodies that "I would love to have just in case" and end up with a cumbersone monster... LOL Still it is an option. Of course modern rectifiers, filters & pass elements are appealing but I am basically a tube person... The ARRL offers a large number of PS's designs in one or another of their Manuals and I would probably go for one of them. It will be during winter here as the shed is rather broiling still. Thank you all Sam

RE: POWER SUPPLIES	Reply
by RADIOFREEISRAEL on October 10, 2009	Mail this to a friend!
Greetings, I have noticed that the HEATH power supplies are very popular and I have been studying ebay's listings. Decision time will be in a couple of weeks. Thank you Sam

RE: POWER SUPPLIES	Reply
by WA6HDZ on October 19, 2009	Mail this to a friend!
Heath, Eico, Knight and several others made adjustable HVDC power supplies in the 1950's and 60's. The ones I've seen used a shunt regulator based on a pair of 6L6's and were very similar in design. Heath equipment attracts collectors but the other brands often go for very reasonable prices and are usually just as good.

RE: POWER SUPPLIES	Reply
by RADIOFREEISRAEL on October 20, 2009	Mail this to a friend!
Thank you WA6HDZ, I searched for HEATH and indeed there some supplies for sale and also EICO. Sooner or later I will try to buy one of them as my retirement budget may allow. Hmmm... :) Cordially Sam

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