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In the Forum: Audio Discussions
In the Thread: Passive transformer based preamp
Post Subject: Re: Better among worst?Posted by morricab on: 11/8/2005

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"You need to realise that the physically larger a Transformer becomes the narrower the available bandwidth for a given construction. Due to the need to handle a lot of "magnetic bias" SE Output transformers become very large, physically, and have invariably problems on one or the other (or both) ends of the spectrum, even if extreme measures are taken. Transformers problems expand expeonentially as size goes up. However, this means comparably small line level devices (or MC level ones) can be made to levels of perfection that appear incredible in the light of the performance of generic tube amp output transformers."

That is exactly my point as to maybe why you don't think parallel SET amps sound so good.  They need even bigger/higher power transformers, which gives rise to the problems you have mentioned.  Check out the Wyetech Topaz amp and in its mono form it was using two smaller (though still pretty big) output transformers and combining the signal in parallel after the transformers. Now I see that their latest version of the amp has gone away from the Svetlana 572-10 tube and back to the 211.  For one thing the 572-10 is no longer in production but seems to be a very good sounding "big" triode (it is actually quite small for its rated dissipation) (the Viva Aurora used to use this tube also (but maybe the 572-3 type) and sounded very good as well).  It is interesting that this designer prefers the 211, maybe for the reasons you have said. 

"Well, the OEM pricing of a pair of "onehundert series" S&B Transformers is several 100% that of anything seemingly comparable based on standard cans and lams."

You may be right.  It would perhaps be worthwhile to look into "better" transformers but I am not sure that an advantage can be found over just going RCA to XLR adaptor into the balanced inputs and thereby bypassing the transformer altogether.  What do you think?

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