Another update: First of all, I'm not really sure whats up with the different versions of this amp. In this thread, second post:
viewtopic.php?t=124211#p1449475
you can see gut shots of a Roccaforte HG100 that is loaded with OD715 caps with 3 yellow box caps used as cathode bypass caps. The date codes on the tranny's and the sig indicate October 2004.
The first pic below is my amp. This pic is after a few changes, but at this point, the majority of the amp is what I believe to be stock. The date codes on my amps tranny's are SEPTEMBER 2004. The changes seen in the pic are: Audio taper gain and master pots with Friedman style master volume, first cathode cap changed to a NOS ERO .1uf cap, snubber on V1B to 1000pf, PI fizz cap upped to 100pf, and I removed the passive insert loop because the switching jacks were funky.
As you can see, ALL the caps are a generic axial film type cap, and in it's original state before the changes, it sounded kinda lame. The biggest factor in the shity sound was a 1uf on the first cathode, where it looks like there should be a .1uf cap. As I stated earlier, the amp looked completely stock when I got it, and I have no idea why there was 1uf cap and a 470pf snubber in my amp. All the other cap and resistor values were correct vs the other schemes that have been posted.
After the changes suggested by nico22, the amp sounded really good, but I was curious to see what it would have sounded like with OD715's. So..... I swapped all the caps for OD's of the same value.
Yeah, that was a big mistake
Amp sounded thin and lifeless.
Next step, as shown in pic #2, was to go back to axial polyester film caps.
I don't have any of those little yellow generic film caps, so I loaded it up with Synergy next gen's + Vishay MKT1813's on the cathodes.
Amp sounds stellar now! Even better than before I switched to the OD's.
The only thing left to do is install a Metro loop ( the existing holes in the chassis are the right spacing
)
This is a really great sounding circuit. It has that bright Marshall kerrang, but it's not harsh. Very similar to a JCM800, but way more gain and maybe just a hair more low end.
I also posted the complete scheme of my amp, and included voltages as well
Enjoy!
Edit: Forgot to mention I added a 33k grid stop on V1B - it just seemed like there should be one there
Also, on the scheme, I didn't draw the bias supply, the power tube cathodes aren't grounded, I didn't show the balancing resistors on the screen cans blah blah blah....
All the good stuff is on the drawing.....