I'm rebuilding a marshal amp. I've got the new power stage sourced.
However...
The preamp and overdrive is still a headache. I need to understand the dynamics before i can design it.
The idea is to use an 12ax7 valve for that.
The input signal on the power stage is set to max 2v. This i quite high. I can adjust to about 1v
Do i need 2 stages before that? I a normal preamp, that will be overdriven by a 2nd preamp? Or do i just give one preamp a very large gain range from clean to crunchy?
Any one got simple circuit diagrams for it?
However...
The preamp and overdrive is still a headache. I need to understand the dynamics before i can design it.
The idea is to use an 12ax7 valve for that.
The input signal on the power stage is set to max 2v. This i quite high. I can adjust to about 1v
Do i need 2 stages before that? I a normal preamp, that will be overdriven by a 2nd preamp? Or do i just give one preamp a very large gain range from clean to crunchy?
Any one got simple circuit diagrams for it?