WEM, Watkins, Rush - Pepbox, Rush Pep Box  [schematic]

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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box  [schematic]

Postby Electric Warrior » 05 Dec 2011, 13:55

And here's the silicon version:

Image

Note that the level pot's value is not confirmed. Later incarnations of the Pepbox (or Rush Pep Box) have a 50k log level pot, but no 56k resistor in parallel.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby mictester » 06 Dec 2011, 00:54

Electric Warrior wrote:Whoops, here it is with really correct transistor symbols (PNP):


germaniumpepbox.png



Image
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby Electric Warrior » 06 Dec 2011, 00:58

Big OOOPS! Some friendly builder just pointed out to me that I had the wiring of the Effect pot wrong in both schematics and I forgot to remove the 820k from the silicon schematic :blackeye
Hope I have everything right now.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby Electric Warrior » 06 Dec 2011, 01:00

mictester wrote:
Electric Warrior wrote:Whoops, here it is with really correct transistor symbols (PNP):


You're too fast. It was wrong again for a couple of minutes :blackeye
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby sinner » 25 Feb 2012, 07:48

Here's old school Ge vero layout

The one on my website was wrong

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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby drewl » 08 Mar 2012, 17:25

So which version do you guys think sounds the best?

I was thinking about building that Ge version above.

Thanks.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby bhill » 08 Mar 2012, 21:31

Just looking at both your schematics above on this page, my first thought was that the paralleled 56k and the 500k output pot could be replaced with a 50k log pot. You seeing that in a later version just confirms that.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby Electric Warrior » 08 Mar 2012, 22:01

They copied that from the FZ-1.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby sinner » 19 Jun 2012, 21:20

Request from my favorite beta tester :thumbsup

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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby beedotman » 20 Jun 2012, 08:59

Nice and clean!
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby agoldoor » 16 Jul 2012, 03:37

sinner wrote:Request from my favorite beta tester :thumbsup


Just a heads up, here are my impressions from building this layout that I was emailing to sinner, and thought I'd CC it here.. Consider it verified except for my comments about the DC jack below:

So I've played a lot with the silicon pep box layout, and I wanted to give you what I found out.

First off, it's DEFINITELY a 100K trimpot there. I tried a 25k, a 10k and a 50k before finding the 100k. The 100k has a LOT of different sweet spots in it's sweep, it almost is cool enough that it might dictate being used as a SECOND tone knob. But I didn't do that, I just went with a 100k trimpot set to my liking.

Also, I noticed that on your layout, I don't know if it's just a different way of wiring or whatnot, but it looks to me like you laid out the DC jack and it's grounds like one would in a PNP circuit rather than NPN. So I didn't follow the layout in that part, also I didn't use an LED, so I left that out.

But otherwise, it worked great. Thanks again for your work! You're the man!

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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby alexradium » 09 Apr 2014, 19:55

phibes wrote:To keep discussion rollin, here's how I see the studio 2. I'm not sure on the value of the cap running between collectors but it has to be higher than 5pf. My guess is 47pf-100pf. The 5 might of designated 50.
about JMI studio 2,schematic is ok in general,the one i have for repair has a 3300p in parallel with the 1M res,a 33p cap on Q2,10k trimmer in place of the fixed resistor,250kA level pot,1kB effect pot,47uF on +9V.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby capricorn_1 » 11 Apr 2014, 09:34

The silicon version I do (big red slab version) has no 56k resistor, 50k level pot, 500k trimpot.
I actually have the PCBs on Ebay if you do a search! The PCB has the option of adding an output capacitor 'tone' control which is quite useful.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby alexradium » 11 Apr 2014, 11:34

The original Pep box is quite different from the JMI,which in fact is a fuzz face,i don't know why they advertise its an exact replica,maybe there is a lot of people ready to spend 300 pounds and don't care what's inside....
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby capricorn_1 » 11 Apr 2014, 13:17

also forgot to say the one I traced had 12.5uf electrolytics, I use 12uf in my clone, I guess 10uf could be used as well.
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby Masuto » 14 Nov 2014, 07:14

Im going to plunge myself in this.. Its great to see how you managed to tackle it from legend and bay shots to a viable bunch of layouts! I am intrigued by this mytical charachter, Pepe Rush (Pepe is a spanish name btw, not italian), who apparently was an italian electronics engineer based in the London West End and who designed also amps.. Any more about him?
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby petey twofinger » 16 Nov 2014, 15:55

he was an amazing plumber .
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby Masuto » 19 Nov 2014, 22:22

petey twofinger wrote:he was an amazing plumber .

Yes, and he could do double jumps.

Wow razor sharp humor here! ;)
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Re: WEM, Watkins, Rush - Pepbox, Rush Pep Box

Postby Rocket Roll » 31 May 2018, 15:09

I've tried to build the PNP Germanium version using a PCB from here: http://effectslayouts.blogspot.com/2015 ... p-box.html

However, even with multiple transistor changes (70-90 hFE works best), the unit sounds nice (for a raspy, bass-heavy fuzz), but pops obnoxiously when (dis)engaged and loses a lot of volume in front of VOX AC30's Top Boost channel. Also, you can hear in British Pedal Company's video that the volume pot riding functions normally on their reissue. With this layout, if you try to turn the volume down, the sound cuts in and out, which shows (at least) that British Pedal Company's (correct?) reissue and this layout are two different beasts.
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