Durham Electronics - Sex Drive  [traced]

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teleman
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Post by teleman »

I tried a Mucho Boosto today and didn't like it too much. It had a fizzy or fuzzy top end that couldn't be dialed out even on warm settings. I was using a modified Vibroverb and a Tele with Lawrence and Fralin pups. It did sound better for rhythm than lead.

Apparently it is the same circuit as the Sex Drive with some changes to give it more gain.

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Post by analogguru »

aloupous wrote:Hmm... Just opened this up ... The board is gooped .. the whole thing...
analogguru translation wrote:.....very much is to be goop inside...
Never buy a gooped pedal:
Goop only proves, that the pedal is not worth the money people charge for it.

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aloupos
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Post by aloupos »

I think it delivers on what it is supposed to do: A really clean boost, with some compression if you want. Still, I've never seen this circuit around and I'd like to know how it works.

The goop is a hard, cream colored goop. When I drill into it carefully with a dremel, a black powder residue can be seen. I've tried putting a little acetone on it, which doesn't really soften it. Any ideas? How should I go about removing it?

I'm ok if I damage say 1 or 2 components that I can replace, but I'd rather not destroy the board ...

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Post by Spewbag »

aloupos wrote:I think it delivers on what it is supposed to do: A really clean boost, with some compression if you want. Still, I've never seen this circuit around and I'd like to know how it works.

The goop is a hard, cream colored goop. When I drill into it carefully with a dremel, a black powder residue can be seen. I've tried putting a little acetone on it, which doesn't really soften it. Any ideas? How should I go about removing it?

I'm ok if I damage say 1 or 2 components that I can replace, but I'd rather not destroy the board ...
A hot solder iron.........and no I'm not kidding.

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bajaman
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Post by bajaman »

A hot solder iron.........and no I'm not kidding.
and an extractor fan - so you don't have to endure the pungent fumes :wink:
bajaman

aloupos
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Post by aloupos »

Interesting ... the soldering iron seems to turn the goop to fine powder, instead of melting it as I expected.

It is coming off, but a very slow process.

The PCB came off the enclosure during the process, so here's a shot of the bottom of the pcb:

Image

aloupos
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Post by aloupos »

Definately not much going on here ... looks like 1 ic ... place your bets on what it is:

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Post by analogguru »

And nobody knows, why he needs a double-sided-pcb for this:

http://analogguru.an.ohost.de/temp/Durh ... cks_c2.jpg

Interesting... can this be a TS-style tone-control ?

analogguru
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MKB
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Post by MKB »

One thing you can try is a heat gun and dental picks (and a 1/4" wood chisel for large chunks). If it is potting epoxy, it turns crumbly and powdery when it is heated enough, and then can be easily picked out of the circuit and even off most of the components. At my work we encapsulate circuitry in potting epoxy (the circuitry is designed for operation in water), and we take them apart to the bare boards for troubleshooting with this technique.

Spewbag
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Post by Spewbag »

MKB wrote:One thing you can try is a heat gun and dental picks (and a 1/4" wood chisel for large chunks). If it is potting epoxy, it turns crumbly and powdery when it is heated enough, and then can be easily picked out of the circuit and even off most of the components. At my work we encapsulate circuitry in potting epoxy (the circuitry is designed for operation in water), and we take them apart to the bare boards for troubleshooting with this technique.

LOL! Same here! We do Torque Telemetry Instrumentation but we pot with urethanes instead of epoxy...much cleaner and easier to use imho. There are times when we have to do fall out analysis and we have to excavate.

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foo zen trader
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Post by foo zen trader »

omg... I'm really excited!!! I'm not kidding... can't wait to see more!!! :applause:
thank you so much, aloupos!!!
JABBA DABBA DOOM

aloupos
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Post by aloupos »

Wow,OK I'll work a little more on this de-gouping and see what I can come up with.

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Post by mrhenry »

Any word on how its coming getting the potting epoxy (if that is what it is) out of there? I have a couple Durham pedals (Boosto and Crazy Horse) and I would like to 'degoop' them but I am a noob and I'm afraid i'll put myself out of some cash if I screw it up. So, I am just looking for a report from those more experienced so I can proceed with degooping it and getting some photos of those circuits/components up here on the forum. I don't know why Alan is so concerned with gooping stuff up; he's a really nice dude and doesn't at all come off like some other boutique builders (you all know who I am talking about) so it just doesn't make any sense for him to do this. Is there advantage at all to this stuff? does it stabilize the components, prevent damage etc.? All I can think of is that It sure makes it a bitch to repair something if any of those components fail or if a wire shorts etc. etc. Its just a bit disappointing.

Anyway, just checking up on a topic that hasn't seen action in a while.

cheers,
mrhenry

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Post by analogguru »

There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

electrhysity
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Post by electrhysity »

It's been a while...anybody got any info on the sex drive circuit?

Ben N
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Post by Ben N »

My totally baseless guess: Orange Squeezer mod.

HAR_RJ
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Post by HAR_RJ »

Any news yet on the Sex Drive?
Thinking it may be YATS but don't know how the compression switch would work.
RJ

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Greg
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Post by Greg »

It would be great to add this one to the "solved" pile... and it doesn't look too complicated.

aloupos.. are you out there ?
Can you tell us how you fared with it ?
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HAR_RJ
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Post by HAR_RJ »

I guess this one is at a dead end.

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coldcraft
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Post by coldcraft »

any word here?
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