Tube Amp Archive

Slowed down a little on this... waiting to figure out a parts order for an unrelated project so I can have everything shipped at once. Meanwhile, I had a .022 cap in stock so I put that in for C15 to see what would happen. As predicted the Mid & Bass controls lost a lot of their capacity to adjust. ...

You might not want to go all the way up to 22n on C15. At least according to spice that'll give you a somewhat flat response across the control sweep since the treble and bass controls have a pretty limited effect stock. I haven't tested any of this in person and it's all based on simulation so you...

Neat to see they did something a little different. I'll play around with it a bit tonight in spice if I have time. The mid's control is a bridged-T notch filter. If you remove C18 it's the basic big muff style tone control. You can use the Duncan tone stack calculator to play around with it a bit a...

@pompeiisneaks - Thanks... I thought it crossed lines. @Stevem: >The first thing I would try / audition would be to change out C15 for a .022 cap. Just verifying that you mean .022uF for c15? The current cap is only 560pF. > I need to ask , does your guitar(s) not have a tone pot on them to roll bac...

Qualifier: I'm electronics light! The Fender Frontman 25 tone stack seems to be quite a bit different than the usual Fender tone stack and any others I've seen. The result is that the amp requires EQ settings of something like Treble 1, Mid 7+, Bass 3 to get a usable tone. Widely documented 1000 tim...