Doesn't seem like a whole lot to reverse... as I already said, start with the cranked AC and change the values a bit to be a bit more beefy at the front end. It's very simple - just a couple of jfet gain stages with a dual low pass filter on the end (like ROG, BSIAB, etc). Tone control is in the same place - just a pot between a larger cap on the end.HEAD wrote:Yeah of course we've got a detailed shot of the component side. What we need ist a detailed gutshot of the trace side which you could kindly provide so that we can draw the schematic and then might be able to help you. A detailed shot of the trace side alone isn't always that helpfull, you know?
Wampler - Plexi-Drive [traced]
- indyguitarist
- Resistor Ronker
- azrael
- Cap Cooler
Thanks Brian! Your insights and openness are greatly appreciated.
Guys, I'm sure mimicing the bypass capacitor and cathode resistor scheme of a JCM800 or plexi will get you reasonably close. This is what breadboards are for!
Guys, I'm sure mimicing the bypass capacitor and cathode resistor scheme of a JCM800 or plexi will get you reasonably close. This is what breadboards are for!
- culturejam
- Old Solderhand
Information
- quaternotetriplet
- Resistor Ronker
this is nice.. plexitortion would be next?culturejam wrote:This schematic was donated anonymously.
Information
Hi,
Change the 15K Drain resistors to 100K trimmer and it adjusts after hearing.
regards Uwe
Change the 15K Drain resistors to 100K trimmer and it adjusts after hearing.
regards Uwe
C3 47pF is obviusly wrong, 470pF (must be write 471) is right.
Used the Cranked AC Vero layout with little mod , works well.
Used the Cranked AC Vero layout with little mod , works well.
- andregarcia57
- Cap Cooler
it's verified ?culturejam wrote:This schematic was donated anonymously.
Thanks
- hbo
- Breadboard Brother
Information
Threw this vero together yesterday. It has been verified and reportedly sounds just like in the videos.
- Ghandi
- Solder Soldier
the plexi-drive sounds very promising,
although I could see that if you use it with a blackface or with some kind of a jensen speaker it could miss some of the plexi/greenback mid punch.
maybe the bsiab2 aka box of rock tone control could solve this problem, I'll need to try that!
Anybody done that before? Brian have you experimented with different tone stacks?
I think the next one on my build list will be the run off groove thor.
So far I have build the BOR, Rust Driver, Purple Plexi...
cheers
ghandi
although I could see that if you use it with a blackface or with some kind of a jensen speaker it could miss some of the plexi/greenback mid punch.
maybe the bsiab2 aka box of rock tone control could solve this problem, I'll need to try that!
Anybody done that before? Brian have you experimented with different tone stacks?
I think the next one on my build list will be the run off groove thor.
So far I have build the BOR, Rust Driver, Purple Plexi...
cheers
ghandi
- Ghandi
- Solder Soldier
I do that often with marshall inspired overdrives...
I did a box of rock with them and compared it with the regular unit, that was like night and day.
The mustard caps really bring the marshall mids to the front and also retain clarity like no other cap!
cheers
ghandi
I did a box of rock with them and compared it with the regular unit, that was like night and day.
The mustard caps really bring the marshall mids to the front and also retain clarity like no other cap!
cheers
ghandi
- grrrunge
- Diode Debunker
Information
Consider this one "verofied" once more It's certainly going to cover that Hendrix/Clapton territory pretty vell...
A true believer in the magic of Sherwood Forest Pedal Pirates
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New base of operations: http://www.knucklehead.dk
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New base of operations: http://www.knucklehead.dk
hey guys, I'm almost there, I'm getting faint signal on output, I think it's faulty tranny...
anyway is there someone willing to post voltages on trannies?
thx
anyway is there someone willing to post voltages on trannies?
thx
- grrrunge
- Diode Debunker
Information
I'll hook my build up later, when i get off work. Meanwhile you could post pictures of your build, so the rest of us can check it out as well...whosyourdaddy wrote:hey guys, I'm almost there, I'm getting faint signal on output, I think it's faulty tranny...
anyway is there someone willing to post voltages on trannies?
thx
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
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New base of operations: http://www.knucklehead.dk
- grrrunge
- Diode Debunker
Information
I just got a lot of extra work on my hands, so i won't be able to do any fun stuff tonight. Sorry! It might be as late as wednesday or thursday before i get around to do some measuring...grrrunge wrote:I'll hook my build up later, when i get off work. Meanwhile you could post pictures of your build, so the rest of us can check it out as well...whosyourdaddy wrote:hey guys, I'm almost there, I'm getting faint signal on output, I think it's faulty tranny...
anyway is there someone willing to post voltages on trannies?
thx
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
---
New base of operations: http://www.knucklehead.dk
no worries I've solved the problem, I overlooked C6, thought it has one strip space between terminals.
now it sounds great, plexi sound it is.
here are voltages if anyone needs them: (supply 9.02V)
Q1: (DSG) 3.65V 0.36V 0V
Q2: (DSG) 5.37V 0.24V 0V
Q3: (DSG) 3.76V 0.35V 0V
now it sounds great, plexi sound it is.
here are voltages if anyone needs them: (supply 9.02V)
Q1: (DSG) 3.65V 0.36V 0V
Q2: (DSG) 5.37V 0.24V 0V
Q3: (DSG) 3.76V 0.35V 0V
- grrrunge
- Diode Debunker
Information
Good to hear I like mine pretty damn good as well!whosyourdaddy wrote:no worries I've solved the problem, I overlooked C6, thought it has one strip space between terminals.
now it sounds great, plexi sound it is.
here are voltages if anyone needs them: (supply 9.02V)
Q1: (DSG) 3.65V 0.36V 0V
Q2: (DSG) 5.37V 0.24V 0V
Q3: (DSG) 3.76V 0.35V 0V
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
---
New base of operations: http://www.knucklehead.dk