I am also looking at modifying this amp. I bought it so I could start learning about upgrades and tube circuits. I play it on my Adagios by Acoustic Zen at times and it is very nice. I also upgraded the tubes, it was a good move, I am using jj el34s and miniwatt ECF802s. I like them, I have few others to try, but haven't spent m8hc time doing it in a while.
Right now I am struggling to understand the circuit, hopefully to try to draw a schematic and be able to play around with it a bit. Mostly to stretch and expand my electronics knowledge from oh so long ago...
Somewhere I swear I saw a recommended and simple modification, something to do with the output transformer connections, but I recently moved and I can't locate it.
So far it seems that the manufacturer Cap changes are simple coupling cap upgrades, that should be easy.
I think there may be a few extra caps in the signal path or directly affecting it and if I can figure which these are I would replace them as well. There also may be a little benefit to upgrading and increasing the power supply caps a little.
If I do come up with a schematic, I will be needing help with it, perhaps from the awesome folks at the DIYforum.
I would love to stay in touch and share anything we figure out.
