Tube Amp Archive

Also just a quick comment for those wondering why I’m trying to do this, it’s all part of an obsession I have for the 1959 circuit. I’ve been through it front to back and made test variations to achieve optimal tone, and the interaction of the 2 volume circuits is part of that. The intent isn’t to O...

Thanks to everyone for all your help and input I really appreciate it! Time go mess around a bit.

Reeltarded you hit the nail on the head that a 500k pot on volume 2 in lieu of 1 Meg would resolve the issue. Was looking for some other circuit way of achieving the same thing.

Thanks for all the responses guys. And yes it seems humorous I get that, but there’s a method to my madness! It is funny to maybe just reset the knob on 10 by removing the cover and regluing it, or resetting the set screw so it appears on 10 haha :P Reeltarded those are great suggestions, and yes I ...

Also another reason I believe it to be too much signal going into V2 is that when a lower gain tube is placed there (like a 5751), the issue goes away. So I was looking for a simple logical way of altering the circuit to reduce signal into V2 so that a standard 12AX7 can be used. Change the mix resi...

This is without jumping channels. Straight into input 1 high. The second volume adds girth to the sound and is ‘ideal’ at 7. Was curious to know circuit wise why it falls flat past 7 or 8 or so and turns into a mess. Certainly there is a circuit reason why, and therefore a circuit change that can be...

Oscillating? Can you tell me more about this?

It’s fascinating to to me that some are ‘ok’ all on 10, but mine needs to be all on 10, except one of them at 7, for optimal tone. Again the search continues.

All excellent input (no pun intended) thank you.

Thank you so much for your response and suggestions! You are correct to say I’m bothering with it. Yes indeed it’s an annoyance rather than a serious issue, but I’d like to know why some stock Marshall 1959’s are able to run all on 10 and some aren’t. There must be a logical circuit reason as to why...

Thanks for the advice. And yes you’re correct. The original post was already long so I didn’t mention that tube strength (and type) along with pickup output level affects the ‘over compression/flabby’ effect. But the point of my frustration is that some plexi amps can do it just fine with average 12...

Yes. It’s really something that has driven me nuts for a LONG time.

Hello question about Marshall ‘plexi’ style amps and similar amps that have 4 inputs and 2 volume controls… I have 2 stock Marshall 90’s reissue 1959’s. I want to run them all controls on 10 including both volumes 1 and 2 with guitar going straight into input 1 high and no jumper. However, when chan...