Treble boosts and Marshals are like pb&j. There are so many types and brands of great boosts- where do you start?
I personally like LPB and mosfet boosts.
I personally like LPB and mosfet boosts.
More gain from a small Plexi
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Here's a bit of a left turn...
I can't seem to find a definitive schematic for this model, but it would appear to have a "normal" Marshall tonestack, minus the midrange control. IF, and I emphasize "if", it is like typical Marshall/Fender tonestacks, then it provides some passive loss. A mod I learned about, and implemented quite successfully on a blackface Tremolux I owned some 30 years back, involves lifting the ground connection of the tonestack.
This pic shows a standard treble/bass/middle tonestack. It works by bleeding off signal, selectively, to ground. In Marshall and Fender amps that might only have treble and bass, the middle control is replaced with a fixed resistor - which is what I had on my old Tremolux head. When the ground path is severed/lifted, that passive loss is drastically reduced, resulting in a heftier signal hitting subsequent stages. It's not an increase in "gain", per se. It just conserves more of the pre-amp signal. I installed a jack for a footswitch to lift/resume the ground connection, and found that it produced a nice volume boost and a little more grind.
Note that this mod effectively disables the bass and middle controls, but tends to leave the treble control functional.
Again, all of this presumes that the tonestack in your amp corresponds to the typical Marshall/Fender topology. Something to think about.
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I can't seem to find a definitive schematic for this model, but it would appear to have a "normal" Marshall tonestack, minus the midrange control. IF, and I emphasize "if", it is like typical Marshall/Fender tonestacks, then it provides some passive loss. A mod I learned about, and implemented quite successfully on a blackface Tremolux I owned some 30 years back, involves lifting the ground connection of the tonestack.
This pic shows a standard treble/bass/middle tonestack. It works by bleeding off signal, selectively, to ground. In Marshall and Fender amps that might only have treble and bass, the middle control is replaced with a fixed resistor - which is what I had on my old Tremolux head. When the ground path is severed/lifted, that passive loss is drastically reduced, resulting in a heftier signal hitting subsequent stages. It's not an increase in "gain", per se. It just conserves more of the pre-amp signal. I installed a jack for a footswitch to lift/resume the ground connection, and found that it produced a nice volume boost and a little more grind.
Note that this mod effectively disables the bass and middle controls, but tends to leave the treble control functional.
Again, all of this presumes that the tonestack in your amp corresponds to the typical Marshall/Fender topology. Something to think about.
I like where you’re going with that. I’ve done Egnator’s amp building course and normally wouldn’t hesitate, but this amp is a bit of a collectors piece so I’d hate to eff it up. I’ll try some pedals first. Thanks for the cool idea though.Here's a bit of a left turn...
I can't seem to find a definitive schematic for this model, but it would appear to have a "normal" Marshall tonestack, minus the midrange control. IF, and I emphasize "if", it is like typical Marshall/Fender tonestacks, then it provides some passive loss. A mod I learned about, and implemented quite successfully on a blackface Tremolux I owned some 30 years back, involves lifting the ground connection of the tonestack.
This pic shows a standard treble/bass/middle tonestack. It works by bleeding off signal, selectively, to ground. In Marshall and Fender amps that might only have treble and bass, the middle control is replaced with a fixed resistor - which is what I had on my old Tremolux head. When the ground path is severed/lifted, that passive loss is drastically reduced, resulting in a heftier signal hitting subsequent stages. It's not an increase in "gain", per se. It just conserves more of the pre-amp signal. I installed a jack for a footswitch to lift/resume the ground connection, and found that it produced a nice volume boost and a little more grind.
Note that this mod effectively disables the bass and middle controls, but tends to leave the treble control functional.
Again, all of this presumes that the tonestack in your amp corresponds to the typical Marshall/Fender topology. Something to think about.
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