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Old 1st May 2013, 08:21 PM   #21
rongon is offline rongon  United States
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Originally Posted by centraltexastubeguy View Post
Thanks for the comments, all. I would like to get back on topic which is: what are the best PP transformers in the 30-100W range. Based on personal experience, not just hearsay.
My reason for revealing a bit about the topology under consideration was to aid in the flow of input regarding transformer sources.
So, yes, a list of manufacturers but put thru the filter of individual experience. That will be greatly appreciated!
Thanks again!

For either PP triode or PP UL, Tango and Hashimoto have sounded best to me. I have also messed with vintage OPT's from UTC, Dyna, Scott and Fisher. The Tango and Hashimoto OPT's I've heard or used have far surpassed the vintage OPT's. I have not heard Electraprint or Sowter.

A friend built a simple PP EL84 amp with Edcor iron and said the OPT's sounded extremely good considering the price. I'd like to try a pair of those.

I hope that's the kind of opinion you were looking for.
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Old 4th May 2013, 11:11 PM   #22
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Indeed! Thanks so much! Nothing like personal experience attached to a name(s).

Due to their relatively low cost, it sure would be great if the Edcor off the shelf turns out to be good. I'll look into Tango and Hashimoto.
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Old 5th May 2013, 12:58 AM   #23
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A good friend of mine who has quite a nice lab full of high end test equipment allegedly did a valid comparison of a bunch of output trannies, and swore that the more expensive ones sounded better. When he stepped out of the room for a moment, his side kick buddy told me he was there and heard no difference at all between any of them...

I've been having very good luck with Hammond power and output transformers for years, for both high end hi-fi and guitar amps. I've only gotten one bad one in about 20, and I returned it for a replacement. I usually buy them through Antique Electronics in Arizona. Although I haven't tried the more expensive brands personally, I suspect that they are really just fool traps, much like fancy speaker wire. Really cool looking, with rare earth elements in the core (cobalt for ex.), maybe pure silver wire, etc., and on the bottom line not audibly better than hammond cheapos, at least not to my ears. My Hi-Fi tube amp only has a max of 12dB negative feedback (adjustable 0-12), so minimal distortion correction, and it sounds dam good to my ears.

I've been a hard core audio engineer since the 60's so I would think I would know how to judge sound, but to be fair, there are those who say they can hear the difference.

My guitar amps that I built using Hammond Hi-Fi transformers sound so much better than the other guitar amps in the band I'm in (2 other guitarists, Fender and Peavey, all tubes), it borders on being embarrassing. I'd worry more about getting the impedance match to the tubes right, and use a topology that has minimal crossover distortion when in clipping.

You can check out my "Musicbox" 30 watt per ch. Hi-Fi tube power amp at:

Last edited by Bob Richards; 5th May 2013 at 01:00 AM. Reason: link didn't work.
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Old 5th May 2013, 02:07 AM   #24
BudP is offline BudP  United States
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Any of Edcor's units are competently designed and well built. Hammond is a bit more variable. Don't bother with the "high end" boutique makers like O-Netics, Intact Audio, Tribute Audio, Sowter, Lundahl etc, until you know exactly what you do not like about the Edcor product. Chances are very good you will never need to spend more.

"You and I and every other thing are a dependent arising, empty of any inherent reality" Tsong Ko Pa
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Old 5th May 2013, 02:38 AM   #25
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Great stuff, fellows! Thanks so much, I hope it keeps coming.

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Old 5th May 2013, 08:00 PM   #26
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the Edcor I didn't like for push-pull pentodes. the single ended for a 6em7 was good for them.

the Black enclosed hammond transformers I like them for push pull DHT and pentodes on more of the budget stuff. I've had manufacturing inconsistencies with the yellow bobbin ones.

If you want to build a higher end, Plitron or Hashimoto is the way to go for push-pull.
Otherwise, the black enclosed Hammond works good.
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