Cornish P-2 guts

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Cornish P-2 guts

Postby silverface » 16 Mar 2009, 16:36

Found these pictures a while ago. They don't show much, but it's nice to look at :)
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Re: Cornish P-2 guts

Postby sergedeep » 16 Mar 2009, 18:03

what an inefficient use of space... whatever circuit is in there, I'm sure we could make a layout to fit it in a 1590B type enclosure
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Re: Cornish P-2 guts

Postby ech0es » 16 Mar 2009, 18:10

the cornish size is very useful, specialy the depth, if you put a boss pedal (for example) under the cornish, you can switch the both at the same time with your foot.
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Re: Cornish P-2 guts

Postby Jarno » 16 Mar 2009, 18:21

Amen to that (inefficient use of space) , but shoehorning stuff in petite boxes is the least fun aspect to making your own effects (IMHO, anyways). Just finished a Eternity (actually it's more a Landgraff/ CJOD clone), for the birthday of a friend of mine (with the hope of getting my TS10 back :-) ) Took quite some "leaning into" to get everything in a B sized enclosure.

The fridge sized power conditioners on his site keep on amazing me, why would you do something like that? If the power goes down, the PA goes as well, why bother having your own stuff up and running? It needs to have just enough time to shutdown gracefully, so it will restart properly.

To keep it on-topic, why would he use shielded coax inside a metal enclosure? And, even though it looks bombproof, I would worry about the vibration behaviour of the relatively heavy cable harness, tieing it to the enclosure would be better I think.

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Re: Cornish P-2 guts

Postby JiM » 16 Mar 2009, 23:10

Jarno wrote:The fridge sized power conditioners on his site keep on amazing me, why would you do something like that? If the power goes down, the PA goes as well, why bother having your own stuff up and running? It needs to have just enough time to shutdown gracefully, so it will restart properly.

Maybe the PA also runs on it ?
Or more likely it serves to adapt to any power outlet voltage/frequency during Wolrd Stadium Tours, without worrying for your expensive gear ...
Jarno wrote:To keep it on-topic, why would he use shielded coax inside a metal enclosure? And, even though it looks bombproof, I would worry about the vibration behaviour of the relatively heavy cable harness, tieing it to the enclosure would be better I think.

Even inside enclosure, shielded cable can be useful for signals to be highly amplified, and that could pick noise from another part of the circuit (the worst case being charge pump or digital clock).

I sure looks tough, with nice heatshrink on most wires ends, and more than enough for stage (ab)use, but that's not my definition of "bombproof".
Look at these standing resistors, platic stand-offs, and hanging battery case ...
[smilie=a_doh.gif] nevermind, i should not compare to stuff actually made to survive seismic activity.
http://www.sercel.com/Products/Seismic_ ... ronics.php
ftp://ftp.sercel.com/pdf/brochures/LAUL-LAUX.pdf
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Re: Cornish P-2 guts

Postby Jarno » 17 Mar 2009, 11:24

I regularly have things vibration tested for my work, and it's always fun if they have high speed camera footage taken during testing. The things you think are bolted down which are actually doing their little tango! Not sure about standing resistors, but especially the bigger electrolytics are very vulnerable, and the cable harness as well, unless you clamp it to the enclosure.
I hadn't heard of the Sercel company but that's interesting stuff!

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Re: Cornish P-2 guts

Postby controller700 » 17 Mar 2009, 12:06

Aahh - he´s painting the PCBs red like Dennis Cornell does. I don´t have a problem with the size, but to me these Cornish Pedals are the most awful looking pedals on the market! Full with screws and cheesy looking stickers...for an unreal price compared to other manufacurers.

I don´t think that his Line-Drivers, Treble-Boosters and Overdrives are worth the extra cash.
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Re: Cornish P-2 guts

Postby puppiesonacid » 23 Mar 2009, 05:02

:roll: yeah, great... pete cornish ...
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Re: Cornish P-2 guts

Postby playon » 23 Mar 2009, 07:15

Those battery drawers take up a lot of space but they a nice feature. I agree his pedals are ugly, that utilitarian Navy gray look doesn't do it for me.
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Re: Cornish P-2 guts

Postby bestegw » 23 Mar 2009, 08:58

OK, my first thought was: Wat does this do? So I went to http://www.petecornish.co.uk, which says:

"The PETE CORNISH P-2™ delivers extremely fat, smooth, and harmonically rich distortion tones, ranging from a relatively mellow crunch to searing high-gain sustain. The pedal is also extraordinarily responsive to playing dynamics, cleans up nicely with even slight guitar volume adjustments, and it provides nearly uncanny single-note definition within chords. Finally, it can crank out insane amounts of gain. Astonishing! Extremely fat tone, quiet, great dynamics, infinite sustain, exceptional chord definition".


So, basically it's a Big Muff Pi.
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Re: Cornish P-2 guts

Postby silverface » 23 Mar 2009, 09:10

His P-1 is supposed to be a copy of David Gilmour's 1974 EHX big muff, and the P-2 is a sort of hotrodded version of that.
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Re: Cornish P-2 guts

Postby David Barton » 07 Apr 2009, 17:15

I fancy the stocky looking gray boxes. They make me feel like there's something important in there, even if it turns out to be average by you all's standards. I really just want someone to trace the circuit so I can PLAY it! My curiosity is killing me and I don't have the skills to trace a straight line. OK not true, I built an SHO last night, but still.

If you guys have an example of a high-quality build, I'd love to see some pictures. Same goes for the "bomb-proof" designs. If this guy is crap, I want to see your A-list builds.

~db
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Re: Cornish P-2 guts

Postby Fuzzer » 07 Apr 2009, 23:19

David Barton wrote:If you guys have an example of a high-quality build, I'd love to see some pictures


There are enough examples here, search a little.
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.
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Re: Cornish P-2 guts

Postby controller700 » 08 Apr 2009, 07:12

What da f**k?!
My pulse goes up when I read shit like:
"You can´t see inside the cases - a white strip seals each unit, and if you break it then the warranty is viod - but we´re told that the components are top notch." :slap:

Damn, what´s going on at cornish?!
He copies a Big Muff and puts a sealing on his boxes, so that no one can copy his copy? That´s sick!!
Reminds me of Roger Mayer´s story about Jimi´s Octavio...
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Re: Cornish P-2 guts

Postby controller700 » 08 Apr 2009, 13:29

biffa wrote:Well,I 'm up on reverse-engineering,but you can't blame a guy for at least trying to protect his product
And no,it's not a big muff
Big muffs don't do subtle,the p2 does
Or do we expect the whole world to just stop making money,and turn everything over to us?
People just wouldn't buy his stuff if it didn't do the job
Gilmour uses a big muff,but he obviously needs a p2 at some time
His gear isn't meant for the bedroom
It's expensive,well built,and has a good following



Amen.
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Re: Cornish P-2 guts

Postby Lovekraft » 08 Apr 2009, 18:47

For what it's worth, I had a Cornish SS-2 and SS-3 about a year ago. They both sounded A LOT like an MXR Distortion +. Neither did much for my LP/Marshall rig, kinda "small" sounding. I had every player that came over check them out, no-one was too impressed. I will say it was DEAD QUIET and very clear/pure sounding. I got the feeling that either would probably work well on stage for some types of music and could be amplified thru a 10,000 watt PA with no issues. Sold'em both for $700-$800 each, don't regret it a bit. Really wanted to poke inside but didn't want the break the "sacred" seal, ha ha.

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Re: Cornish P-2 guts

Postby Ripthorn » 09 Apr 2009, 01:14

I can understand the voiding the warranty if the seal is broken. If you are the manufacturer, you can do it to protect your circuit or just to make sure someone doesn't do something stupid (some guy with more enthusiasm than sense or know how). I have seen lots of electronics like that. I just think it is crazy to charge hundreds upon hundreds for a pedal, that's why I'm into DIY.
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Re: Cornish P-2 guts

Postby rcubed » 09 Apr 2009, 05:06

Is it paint or a colored conformal coating? We use conformal coating on our circuit boards at work as a way to trap potential soldier balls from shorting something out.
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Re: Cornish P-2 guts

Postby yeeshkul » 09 Apr 2009, 06:35

Call me a weirdo but i really like it the old-fashioned way it looks with all that asymmetrically placed screws and funny stickers. Pedals can be easily made ugly, this one is not - there is some sort of harmony when you see all that ugly things together... how is it called ... functionalism? I love it.

Guys what can be the small circuit board at the input and what is the ceramic cap and a couple of resistors fixed right on the output socket? Also do you think he uses a led-free solder? :D
Last edited by yeeshkul on 09 Apr 2009, 06:43, edited 1 time in total.
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Re: Cornish P-2 guts

Postby marwatt » 09 Apr 2009, 11:39

yeeshkul wrote:Guys what can be the small circuit board at the input and what is the ceramic cap and a couple of resistors fixed right on the output socket?

it's not a pre ... is "the buffer"... and me too I would to know what the pourpose of the cap at the output ground.... maybe a MOV? metal oxyde varistor?
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