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Re: SE 304TL

Posted by Dave Cigna (A) on January 18, 2007 at 13:53:58

In Reply to: Re: SE 304TL posted by auahlap@gmail.com on January 17, 2007 at 16:52:52:

No schematic. The basic amp that I heard was just 15E's IT coupled to the 304TL's. The OT's are one of dave slagle's creations with a current canceling winding; the filament current is run through a special winding so as to offset some (or all) of the DC flux in the core due to SE operation. This makes it possible to design and build a reasonably sized and GOOD performing 50W SE OT. The core is still gapped, but it's not much bigger than a 50W PP OT.

Really, with something like this, the power supplies (all of them) are where most of the work lies. Just lighting up those 304TL's is not a trivial task and Jeffrey has gone to a lot of trouble to get it right. Lot's of chokes, some amorphous, some nickel (yes, nickel cores in gapped DC carrying chokes - in a filament supply!) Might even be some steel. :)

-- Dave

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