What are some good Fully Bypassable Marshall Plexi 1959HW Mods?

[FuriousMopar1968]

This Xenrelic guy had some interesting designs going on to give you some more ideas. Here's an SLO layout as well.

Every bit of info is greatly appreciated, thank you!

 

[FuriousMopar1968]

That should be pretty easy. The Meshuggah is just an 800 circuit with diode clipping. Typical Jose mod type of thing. Ceriatone has a layout you can use on their website.

Awesome I will definitely have to check that out, thank you! How well do you think that would adapt to a Plexi circuit?

 

[FourT6and2]

Awesome I will definitely have to check that out, thank you! How well do you think that would adapt to a Plexi circuit?

Similar ball park as this.

 

[FuriousMopar1968]

Similar ball park as this.

That sounds pretty killer. If I could get a tight chunky sound out of the Plexi I’d be pretty satisfied, but the balance is still being able to go back to full stock when switches disabled. I see the new 1959M01 can get pretty gnarly with a boost too. Definitely seems like the Plexi is a great platform for anything haha, Thanks!

 

[FourT6and2]

That sounds pretty killer. If I could get a tight chunky sound out of the Plexi I’d be pretty satisfied, but the balance is still being able to go back to full stock when switches disabled. I see the new 1959M01 can get pretty gnarly with a boost too. Definitely seems like the Plexi is a great platform for anything haha, Thanks!

You won't be able to go back to a stock 1959 circuit with this kind of mod unless you literally put everything on switches. It can be done, but it will be a ton of work. The difference between a stock 1959 and the most basic version of the amp in that last video is at least 20 components as well as additional gain control (But that could be hardwired) and master volume, plus a depth control if you want it. Would be easier to switch between a stock 2203/2204 circuit instead.

And IMO, the 1959 Modified amp is silly and overpriced. They implemented very little of what a typical diode clipping Jose mod entails. They did the bare minimum of about $20 in parts and work.

 

[FuriousMopar1968]

That should be pretty easy. The Meshuggah is just an 800 circuit with diode clipping. Typical Jose mod type of thing. Ceriatone has a layout you can use on their website.

Is the Chriatone layout the Gargoyle?

 

[FourT6and2]

Is the Chriatone layout the Gargoyle?

Yep, that's the one

 

[FuriousMopar1968]

Yep, that's the one

Thank you! I may look at that for reference for sure. Take some of the specs and apply them to the 100 Watt 1959HW. The schematics available on their site?

 

[FourT6and2]

Thank you! I may look at that for reference for sure. Take some of the specs and apply them to the 100 Watt 1959HW. The schematics available on their site?

Yeah the layouts are all there

 

[SonVolt]

Great topic. Are all these mods applicable to the 1987x or should I start a new thread?

 

[FuriousMopar1968]

Great topic. Are all these mods applicable to the 1987x or should I start a new thread?

I would imagine so, the mods Ive been directed to so far apply to the 50 Watt models also. Please feel free to use this thread. I’d love to gather more info on everything Plexi modding for the project brainstorm.

 

[matttornado]

I tried just about every mod there is with my PLEXI and after all of that, the only mods I would do are to add a PPIMV and remove the bright cap so the Vol.1 is more usable if not turned up all the way.

 

[andrewd]

Always wanted to try the 50k Mid pot, but I don't have the heart to pull the trigger on a very clean & stock year 1975 100W 1959...

 

[matttornado]

Always wanted to try the 50k Mid pot, but I don't have the heart to pull the trigger on a very clean & stock year 1975 100W 1959...

I tried that too but realized that my amp already had enough mids already. It was a fun experiment though. That mod is only good if the amp lacks mids when the Middle control is all the way up. It'll do nothing special other than that.