Fender PA100 mod

[Smokebreak]

I got a job modifying a Fender PA100, and the owner gave me carte blanche. Of course initially he wanted 4 different amps in one, but once I explained things to him, he was cool with my suggestion of a switchable 2/3 stage Marshall thing. He wanted me to use the reverb and wanted a lot of voicing switches. I think I was looking at some Shiva schemes that day because the 3 stage resembles that.
I kept the 12AT7 for the PI, and modified the odd reverb circuit to work. Killer guitar amp now.

[JayB]

How does the reverb sound the you have it now? The way they have that reverb in that amp is strange. Nice job the way you got it now.

I built a fender/marshall two channel amp with the typical reverb and it sounds really good. I used two gain push/pull pots that switch out the bright caps on the gain pots. A switch to by pass the 470pf/470k before the second second stage. Then a dual pole swtch to switch the cathode bypass caps on the last two stages.

[Smokebreak]

Sounds like a cool amp you have there! I tinkered with the reverb a bit to get it to sound good, as it was a bit weak at first, using the stock circuit and my insertion point. My changes from stock was a 1M infront of the at7 stage(it was 100K or something), and I bypassed the at7 Rk. Everything came to life at that point, and there's plenty of good sounding reverb on tap. The insertion point/220K seems to be a good enough spot, and that 220K is fairly common anyway in some high gain amps w/o reverb, between the Treble and MV pot.