Wednesday, 7 February 2024

Electronic Audio Experiments Musicman HD Preamp

 Schematic is avaiable HERE.

*Edit 240216*   wyongroadelelectroncs verified this layout. He also noticed that the Bass and Mid pot connections was is incorrect in the linked schematic. The Layout is updated and tagged.




14 comments:

  1. Hi!! Thanks!! Any chance for the Cornestone Gladio SC?? The schematic is up on Pedalpcb.Cheers!!

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  2. This one looks interesting! Anything on EQD's Blumes Bass Driver yet?

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  3. Replies
    1. I think it's emulating solid state pre equipped Music Man guitar amps. I saw Joe Strummer playing one in a clip the other day. I may be mistaken but I think The Band are playing them in The Last Waltz. Correct me someone if I'm wrong.

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    2. I really like the Blackstone as a bass drive personally.

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    3. The Blumes is for bass (and totally unrelated to this circuit). It's basically a modern Tubescreamer for bass.

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    4. Pedalpcb has boards for the Blumes; the build doc isn't uploaded yet, though, and I've not seen the schematic elsewhere online. My guess is that the only real difference between the Blumes & Plumes is that the input cap has been raised from 33n to something like 100n or 220n, and maybe the feedback caps upped from 56p to 470p.

      In the meantime, though, if you want a bass-friendly Tubescreamer, look at the Black Arts Witchburner. That thing is pretty gnarly. Run it at 18V to get the same headroom as the Blumes.

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  4. Kinda verified!

    Both the Mids and Bass controls were working in reverse. I checked the schematic and your layout matches it, so perhaps a typo in the original schematic?

    I switched the necessary connections and now it works as you'd expect. I used a TC1044SCPA for the charge pump and 2 x MC1458s (as recommended in the original write-up by EAE) for the op-amps.

    Works great as a clean pedal platform, but really shines in medium-to-high gain situations with it's buzzy, gnarly, harsh distortion sound.

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  5. Very interesting drive. I don't think I've heard anything exactly like it. It reminds me a little of the Demo Tape Fuzz. Lo-Fi and nasty. I love that ragged preamp thing. Thanks for the layout.

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  6. Hey mate! Any chance you'd create an updated layout for this based on John's revision?

    https://static1.squarespace.com/static/56a5a0e242f55268768a0c2b/t/669ff47cff07d0521a562c1a/1721758845055/HD130_DIY.pdf

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    Replies
    1. Working on it. A layout should be up soon...:-)

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