It dropped the output power down from 150 wpc to 60 and I have cranked the bias up as far as I dare. My amp essentially became an SA-3.9 by doing this. It made a HUGE difference in how my amp sounded. One last tidbit - I converted my amp to class A by switching the transformer secondaries to the 39v (if memory serves) pair that are there but capped off (green I think.) You simply re-bias the amp up into full class a after that. As an FYI he also does mods to the older stuff that are supposed to be very good!!! The only reason that I would check with Jon just to be sure is because your amp is actually older and may have used different outputs than the later stuff. HPotter nailed the outputs - they are exactly what mine uses. I have a Ta-300 which is basically an S-250 with a different faceplate. He has also always been willing to share info with me but keep in mind that this is also his business so tread lightly. I've spoken to him several times and he is very knowledgeable both from a topology standpoint as well as the actual products. He's an X-Threshold engineer and his side business is repairing their gear. You might consider calling Jon (sounds like Yon) Soderberg at Vintage Amp Repair.
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