I built an amp with a pair of 6T9 Compactrons tonight, pretty much
following the Nuts and Volts schematic, as long as I had the parts on hand.
The OPT's are Edcors, and I used a Hammond 269EX PT -
the voltages were within a few volts of the schematic, even
though I used a lower voltage transformer.
There is a little low level hum I'll deal with later.
It sounds good - solid bass and plenty of sizzle on the highs,
and it definitely packs some punch for small tubes !
Here are some quick pics ...
The strange rings around the tubes are just reflections.
The five turret terminal boards mounted on the tube sockets are
made by James, and available from Euphonia, very handy.
They have the forked turrets like the bottom of the James transformers.
The only hassle with Compactrons is squeezing everything into
a small space, and the fact that the sockets are cheezy quality.
More pix of my amps at http://tmamps.com
I built an ST-35 the other day with the new stainless steel
diytube chassis from Triode. VERY nice ! As soon as the
sun shines I'll take it out and get some nice pics.