I'm working on redesigning an old amp.. thread here http://www.diyaudio.com/forums/showthread.php?s=&threadid=117944
So, I've been scanning over guitar amp schematics and noticed far more variations than I expected. I thought there was an excepted science to the placement of valves with respect to volume and tone pots. What I've found really made me pause for a moment.
First, can you really put a Volume pot inbetween the two triods in a 12ax7? Will that cause a problem? I saw this in a MesaBoogie amp. It also had a 3 tone stack following the 2/2 of valve 1. Valve 2 was the gain makeup, V3 was after a reverb insert and also the PI. I was under the impression this tone/stack arrangement would somewhat degrade the signal with signal going through so many paths. Most amps I've seen just have a single "tone" pot. What's your take?
Second.. I found a tone stack on an Ampeg Jet after the PI and right before the power tube stage. That flipped my lid.
I've also seen the "master volume" in a place between the PI and Power stage. Is this somewhat common if a master volume exists?
Pardon my newness to the subject, but all of my reading has lead me to examine vintage designs that are mostly simple in concept. I realize every design has it's compromises, but are these examples I presented extreme in anyway? I might try to use a more advanced design in my homebrew amp.
So, I've been scanning over guitar amp schematics and noticed far more variations than I expected. I thought there was an excepted science to the placement of valves with respect to volume and tone pots. What I've found really made me pause for a moment.
First, can you really put a Volume pot inbetween the two triods in a 12ax7? Will that cause a problem? I saw this in a MesaBoogie amp. It also had a 3 tone stack following the 2/2 of valve 1. Valve 2 was the gain makeup, V3 was after a reverb insert and also the PI. I was under the impression this tone/stack arrangement would somewhat degrade the signal with signal going through so many paths. Most amps I've seen just have a single "tone" pot. What's your take?
Second.. I found a tone stack on an Ampeg Jet after the PI and right before the power tube stage. That flipped my lid.
I've also seen the "master volume" in a place between the PI and Power stage. Is this somewhat common if a master volume exists?
Pardon my newness to the subject, but all of my reading has lead me to examine vintage designs that are mostly simple in concept. I realize every design has it's compromises, but are these examples I presented extreme in anyway? I might try to use a more advanced design in my homebrew amp.