Wampler - Plexi-Drive  [traced]

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Re: WAMPLER PLEXI-DRIVE

Postby indyguitarist » 02 Mar 2011, 20:21

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? ;)


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.
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Re: WAMPLER PLEXI-DRIVE

Postby azrael » 06 Mar 2011, 01:07

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! :D
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Re: Wampler - Plexi-Drive  [traced]

Postby culturejam » 15 May 2011, 02:05

This schematic was donated anonymously. :thumbsup


plexi-drive.PNG
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Re: Wampler - Plexi-Drive

Postby quaternotetriplet » 15 May 2011, 07:30

culturejam wrote:This schematic was donated anonymously. :thumbsup


plexi-drive.PNG

this is nice.. plexitortion would be next?
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Re: Wampler - Plexi-Drive

Postby ecc83 » 17 May 2011, 11:12

whats means C7 105? or C2 222?
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Re: Wampler - Plexi-Drive

Postby mrkaploca » 17 May 2011, 11:25

Those are the value codes printed on capacitors. For example 105 = 1mF , 222 = 2.2 nF
check this out: http://www.electronics2000.co.uk/calc/c ... ulator.php :wink:
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Re: Wampler - Plexi-Drive

Postby lmkv15 » 21 May 2011, 06:43

Hi,
Change the 15K Drain resistors to 100K trimmer and it adjusts after hearing.

regards Uwe
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Re: Wampler - Plexi-Drive

Postby andreaps72 » 22 May 2011, 10:09

C3 47pF is obviusly wrong, 470pF (must be write 471) is right.

Used the Cranked AC Vero layout with little mod , works well.
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Re: Wampler - Plexi-Drive

Postby andregarcia57 » 12 Oct 2011, 04:58

culturejam wrote:This schematic was donated anonymously. :thumbsup


plexi-drive.PNG


it's verified ?

Thanks
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Re: Wampler - Plexi-Drive

Postby hbo » 27 Oct 2011, 09:28

Threw this vero together yesterday. It has been verified and reportedly sounds just like in the videos.

Image

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Re: Wampler - Plexi-Drive

Postby Ghandi » 11 Nov 2011, 19:52

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
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Re: Wampler - Plexi-Drive

Postby Herec » 17 Nov 2011, 15:52

Anybody thoughts on using mustard-type capacitors for the larger values in the circuit?
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Re: Wampler - Plexi-Drive

Postby Ghandi » 17 Nov 2011, 17:31

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
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Re: Wampler - Plexi-Drive

Postby grrrunge » 19 Nov 2011, 16:05

Consider this one "verofied" once more :D It's certainly going to cover that Hendrix/Clapton territory pretty vell...
19112011337.JPG
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Re: Wampler - Plexi-Drive

Postby whosyourdaddy » 21 Nov 2011, 00:27

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
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Re: Wampler - Plexi-Drive

Postby grrrunge » 21 Nov 2011, 06:09

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


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... ;)
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Re: Wampler - Plexi-Drive

Postby whosyourdaddy » 21 Nov 2011, 14:14

well there's nothing special about it, I think it's clean build...
Image Image Image :hmmm:
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Re: Wampler - Plexi-Drive

Postby grrrunge » 21 Nov 2011, 16:32

grrrunge wrote:
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


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... ;)


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... :(
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Re: Wampler - Plexi-Drive

Postby whosyourdaddy » 21 Nov 2011, 23:29

no worries I've solved the problem, I overlooked C6, thought it has one strip space between terminals. :slap:
now it sounds great, plexi sound it is. :applause:

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

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Re: Wampler - Plexi-Drive

Postby grrrunge » 22 Nov 2011, 06:23

whosyourdaddy wrote:no worries I've solved the problem, I overlooked C6, thought it has one strip space between terminals. :slap:
now it sounds great, plexi sound it is. :applause:

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


Good to hear ;) I like mine pretty damn good as well!
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