General > General Technical Chat

Custom "R-core" transformers on ebay

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squibby:
As the thermionic valve freaks on here would be well aware, typical transformers are getting harder to come by with the usual 240 or 110 to 6.3V, 12V, 600V, 175 and many other different combos all wrapped with center taps, different current ratings etc etc.

I bought a custom R-core transformer from ebay to solve this problem, and I can report, it met the specs I gave and it has performed flawlessly to date. They also appear to be quite nice quality. To be fair, they look and feel nicer than a 60 year old worn transformer, and I'm a believer that often, if it looks like it was put together with care, it probably will perform.

I've bought two more now. I gave the specs on ebay, and the seller promptly got back with a price. search for R-core transformer.

whoever is making these does a decent job and very efficiently priced. I just paid 80USD delivered to australia for a pair (yes two) transformers for a heathkit regulated high voltage power supply project I want to make.

SiliconWizard:
Where are they shipped from?
I would assume these are made in China to get such prices for custom stuff.

squibby:
Absolutely. They are chinese.

As electronics fans, we know what good stuff is good. We know Panasonic, Nichichon, Rubycon, etc etc and a thousand and one other brands that make good components already.

What I like about forums like this, is that I can learn what unbranded chinese or otherwise manufactured stuff from amazon or ebay has been trialed out ultimately recommended. I've tried these transformers. They may or may not be very good, but....they seem fine to me for for the money. I will buy more if I can't find a second hand 50 or 60 year old transformer that I would expect to pay less for second hand.

Attached photo of what I'm talking about

jonpaul:
Well, easy to buy lams and DIY any mains trsf.

Many off the shelf EI/EE trsf and lams  readily avail.

For valve (tube) audio aficionados a junked old CTR TV, scope, hifi will have a perfectly fine trsf for filament, B+.

J

Roehrenonkel:
Hi squibby,
 
thank you for pointing it out.

Is there any data given for breakdown-voltage / isolation?
Or can you perform an isolation-test primary to secondary?

In the old days Block had transformer-kits with the finished primary winding for 220Volts.

Best regards

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