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Thread: repairing 1970s DIY on-board distortion unit

  1. #36
    Senior Member vintagekiki's Avatar
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    If it's not too much of an effort upload a photo of a guitar body with magnets and commands, that I try to find some information about it.
    Since this is an active guitar, a stereo jack is required to turn the battery off when the guitar is not in use.
    In the meantime, browse through this book.

    https://pdfslide.net/documents/guitar-electronics-for-musicians-donald-brosnac-568a016c5fdcc.html

    In the book you will find how to connect the battery to the jack.

    Question
    What the guitar has from the controls and built-in effects

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    Last edited by vintagekiki; 08-17-2019 at 01:32 PM.

  2. #37

  3. #38
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    Thanks so much, Vintagekiki. Yes, I can see that one of the sockets on the guitar (the input) is stereo. The guitar was made as an ordinary, quite cheap, Les Paul copy. The effect was added by a previous owner. As friends on here have said, it's actually a real factory PCB, but it was not originally on the guitar. So, the guitar is just a regular LP - pickup selector, 2x vol and tone - but then it also has the Balance/Expander and 1-tone-2 of an FY-6/Superfuzz. There is also a small on-off switch with "Shin-ei" in tiny writing on top.

    My parts have arrived today, so I'm going to have a go now ...

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  4. #39
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    IT WORKS!!!

    !!!

    I can't thank you all enough.

    For the record ... I removed the brown wire that I'd mistakenly attached to the battery clip. I attached it to the switch, on the next lug from the blue wire, per the list that Bill gave. I then put a new piece of black wire on the battery clip, and attached it to the stereo jack (https://www.cigarboxguitar.com/knowl...ars-amps-more/). After I'd eventually found a battery that wasn't flat (!), I inserted it, put the rear cover back on the guitar, plugged into a small practice amp, and got the clean sound first. I turned all vols/gains to 0, then pressed the on switch. As I turned up the amp vol a little, and put the neck pickup to 3, I wasn't expecting anything, but immediately there was a slight fuzz. Got it all up to a sensible volume, and kerpang! It actually produced a sound, and that sound was manipulable by the knobs and switch. It's true that it's deafening, but what does that matter?

    So, my other question was, would it sound any better 40 years later, now that I can play? You bet! It's beautiful! The fuzz itself is the best one I've got, and when the octave kicks in, it's fantastic. This little old guitar has a new lease of life. I think I would tell my 14 year old self, just try not putting everything on 10. That's why it squeals.

    This has been great fun, and there's no way I could've done it on my own. I'm now contemplating buying a kit and trying to build something else. Treble boosters seem not to have too many parts, so I might try one of those.

    Thanks again everyone!

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  5. #40
    Senior Member vintagekiki's Avatar
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    Quote Originally Posted by TheresanLinSolder View Post
    I'm now contemplating buying a kit and trying to build something else. Treble boosters seem not to have too many parts, so I might try one of those.
    If you want to build, listen to sound clips from Ultrasonic XII.

    http://www.vintageguitarandbass.com/vox/Ultrasonic_soundclips.php

    Construction is extremely simple.

    https://www.acidfuzz.com/pages/vox-guitar-fx

    https://music-electronics-forum.com/attachment.php?attachmentid=34132&d=1432849556

    https://music-electronics-forum.com/showthread.php?t=39569&p=385933&viewfull=1#post385933

    Be sure to let us know, how your first project is progressing.

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  6. #41
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    Cool! Will check it out.

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