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RE: Jeff's...

Posted by drlowmu (M) on May 23, 2008 at 13:39:31

In Reply to: Jeff's... posted by jon_s on May 22, 2008 at 12:43:21:

Hi jon s,

I am hopefully building two from-scratch amps in the back half of 2008, and I would hope to have photos posted then.

In the meantime, here is an Eico HF-81 I simply modded in 3-2007 to improve transfer efficiency of the supply. Of course, I was FORCED to use stock lay out.

The heavy brown wiring is equal length Fulton Brown speaker wire, with a single strand of continuous cast copper acting as a bi-wire for each run. Those heavy wire runs you see were actually the THIRD different high quality wire type I listened to in these spots! In most places, the draw is under 1 mA, but the low AWG bi wire was totally needed to keep PEAK instantaneous transients fully intact. I used closely-miked forcefully-struck jazz piano music - to determine the optimum peak needs in the HF-81's rewire.

The green, blue and white and red colored wires were Kimber TCSS, sometimes multiple paralleled. The white 5.0 uF film caps were part of the power supply, a supply filter located right at key points-of-use.

I would never EVER build the amp this way from scratch, and was limited that way. Stay tuned, I'm months away in having photos of a from-scratch execution.....where I can really do it right.

Jeff Medwin

• http://www.audioasylum.com/cgi/t.mpl?f=tubediy&m=142126   (Open in New Window)

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