[FloridaBoy]

Originally Posted by Bombadil

I very much like my HO amp. It sounds great and drives my 91dB speakers to loud levels with strong, solid bass, while still retaining much of the tube "goodness." From what I've read about it, I suspect I would like the PSE amp even better, where the tubes are not driven quite so hard and with the new voltage regulation. That said, the HO does make me happy.

I believe that different types of tubes are affected by the HO design in ways which make the listening experience different with this amp as opposed to triode-design 8 to 10 watt models. The high output tubes, KT88/120/150, sound very natural and powerful. Not surprising given that the amp was optimized for these tubes. While some of the low output tubes sound more stressed, and can be outright unenjoyable.

There is a PSE with IIPS for sale on USA Audio Mart. I bought Beatlebums PSE with IIPS about a year ago and it's a keeper for me.