lovepedal plexi 100
- Thread starter acdsee
- Start date
jesuscrisp
Well-known member
You must forget the dozen of electra variants..
I know he milked that circuit but I dont believe it popped up in the Marshall vein of pedals???
Robert
Reverse Engineer
According to a post elsewhere by @coltonius:
"The 100 is a COT with a rudimentary tone knob (input cap blend) > FET Deluxe 60"
Just glancing over the values on that PCB, it looks like that could very well be the case.
"The 100 is a COT with a rudimentary tone knob (input cap blend) > FET Deluxe 60"
Just glancing over the values on that PCB, it looks like that could very well be the case.
jesuscrisp
Well-known member
coltonius
Well-known member
I have a hand drawn schematic somewhere. I’ll see if I can find it!
Feral Feline
Well-known member
I've got two hand-drawn schematics, but I'm not sure which one to use...
Could probably use both schematics, they go hand-in-hand...
Could probably use both schematics, they go hand-in-hand...
coltonius
Well-known member
I seem to have lost it. Ugh. The following information is from memory, according to a later SNS version:
The Tone control blends between two input capacitors:
The Gain control was the COT50's Bias
(It looks like the version pictured above uses BAT46 clipping diodes in the COT part of the circuit.)
The Delux 60 MOSFET was the same as the schematic on The Revolution Deux, including the Master Volume.
The Tone control blends between two input capacitors:
- Lug 1 > smaller cap
- INPUT > Lug 2
- Lug 3 > larger cap
The Gain control was the COT50's Bias
(It looks like the version pictured above uses BAT46 clipping diodes in the COT part of the circuit.)
The Delux 60 MOSFET was the same as the schematic on The Revolution Deux, including the Master Volume.
Feral Feline
Well-known member
Thanks for that info.
The TONE has me curious, though. That would provide a weird balance, wired as a voltage divider, wouldn't it?
At mid-rotation you'd have the small-cap and large-cap summing for the full value of the two added together, but at full rotation to the large-cap you'd have only the large-cap's value without the small-cap added on top.
I would guess that the small-cap would be always in circuit, and the pot wired as rheostat re-directing signal flow to the large-cap, as per this example from Joe Gore:
Alternatively wired thusly, a 4n7 in the path with a 100n coming off the variable resistor:
Not sure how lug 2 changes things up between the above two schematics, if at all...
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coltonius
Well-known member
Hey, I’m just telling you what I traced, not what sounds best! I remember it distinctly because the this Plexi iteration used the same method as several older Devi Ever designs.
