Post by Bainzy on Mar 4, 2006 20:57:04 GMT
Here's a cool schematic I think some of you guys might be a little interested in... 
It was posted on the Hoffman forum, here's the post:
...Also, I work at SIR in LA, and there is a marshall superlead 100 that was modified by a guy that used to work there in the 80's. I guess he did alot of steve vai and warren dimartinez' stuff. Anyway, I had to tear it apart and see what was doing, I made a schematic, and reworked my 50 watter(for the 6000 time) and good god, it is probably the best sounding marshall type sound I have heard) any way, if you guys want it I can post it for you...
...here is the preamp, the power section is basically the same as the original. I know it is not that far from the original, but it's not near as harsh as a regular marshall. and it sounds alot fatter also.
www.hoffmanamps.com/Forum/yabbfiles/Attachments/superlead.jpg
www.hoffmanamps.com/Forum/yabb2/YaBB.pl?num=1141274264
It won't be the Caswell mod, but I think this is by the guy who copied Stock #39 onto the Stock #36 amp which was used by Slash on AFD. His name was Frank Levi - this appears to be one of the same 'typical Frank Levi 80s mods' as I've seen described elsewhere.
I think it's fair to assume that having seen the Caswell mod he might be influenced by it in his own mods. Remember this part of the Stock #39 story?
So even though the mod isn't switchable, it still could be close to the Slash AFD amp people are lusting over. Once I get a second amp, I'll be trying all these mods. Pure speculation here on my part, but I think that the fact that the Stock #36 amp isn't switchable may be because the normal channel's half of V1 was used for the mod instead of an extra tube. Frank Levi might have thought, "f**k it, people only want this for that modded sound so what's the point keeping the normal channel and having to cut a hole in the amp?"
It was posted on the Hoffman forum, here's the post:
...Also, I work at SIR in LA, and there is a marshall superlead 100 that was modified by a guy that used to work there in the 80's. I guess he did alot of steve vai and warren dimartinez' stuff. Anyway, I had to tear it apart and see what was doing, I made a schematic, and reworked my 50 watter(for the 6000 time) and good god, it is probably the best sounding marshall type sound I have heard) any way, if you guys want it I can post it for you...
...here is the preamp, the power section is basically the same as the original. I know it is not that far from the original, but it's not near as harsh as a regular marshall. and it sounds alot fatter also.
www.hoffmanamps.com/Forum/yabbfiles/Attachments/superlead.jpg
www.hoffmanamps.com/Forum/yabb2/YaBB.pl?num=1141274264
It won't be the Caswell mod, but I think this is by the guy who copied Stock #39 onto the Stock #36 amp which was used by Slash on AFD. His name was Frank Levi - this appears to be one of the same 'typical Frank Levi 80s mods' as I've seen described elsewhere.
I think it's fair to assume that having seen the Caswell mod he might be influenced by it in his own mods. Remember this part of the Stock #39 story?
Another interesting variation between #36 and #39 was that the modification to #36 was always “on.” Whereas #39 had a metal toggle switch mounted in place of one of the amp’s four input jacks (which was used to turn Tim Caswell’s mod on and off), the modification to #36 did not include a toggle switch or any other mechanism to turn the mod off. In fact, to someone looking at the outside of #36, the only perceptible modification would have been the addition of a master volume knob. Even this master volume control would only have been noticeable to the trained eye, since it was done in such a manner as to preserve the amp’s otherwise stock appearance.
So even though the mod isn't switchable, it still could be close to the Slash AFD amp people are lusting over. Once I get a second amp, I'll be trying all these mods. Pure speculation here on my part, but I think that the fact that the Stock #36 amp isn't switchable may be because the normal channel's half of V1 was used for the mod instead of an extra tube. Frank Levi might have thought, "f**k it, people only want this for that modded sound so what's the point keeping the normal channel and having to cut a hole in the amp?"
