I built this last night. I wanted to try the Edcor output transformers,
the CXPP25-MS-8K/23%, which are 8K, 23% Screen Tap, 4, 8 and 16 ohm
secondary. They are really hefty, in fact, they are the same size as the
XPWR005-120 Power Transformer. Ask me how tight I had one bolted
into the power transformer spot before I realized it. The PT has the
same specs as the Dynaco, but it barely gets warm. If you are using
one in an ST-35 where you parallel both 6.3 volt windings, you'll need
to test for proper phase before finalizing the connection, I just used
two sets of crimp lugs, and left one side of one winding hanging, and
tapped it on, no sparks, so I got it right the first time. The output
transformer phasing may need to be experimented with too, mine
oscillated the first time, so I flipped all 8 leads and it was perfect.
Using the barrier strips on the ST-35 board with spade lugs makes it
an easy fix. See my pix for color coding if you use some. I used
Auricaps because I had them, red leads go to the outside.
Bottom line, Edcor is worth a checking out, OPT's are $ 56.52 each,
and the PT is $ 43.21 ...
Tips ... Don't EVER use a Chinese clone UniBit. Don't mark a black
chassis with a blue flair and expect to see it. Don't tighten the trim
ring on your misplaced power switch with tiny pliers. Black Honda
touchup paint kind of works. Permatex black silicone covers sins.
Bottom line ... as usual, this ST-35 kicks ass.
More pics, taken from flattering angles at http://tmamps.com