Thursday, 23 November 2023

Acorn Amplifiers MIGFET 50p Preamp

 A big thanks to Chris Stelloh for the schematic!


 
 
 

 



7 comments:

  1. Sovtek pre? kool beanz. Maybe I'll spend the American holiday building something Soviet.

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  2. I think that you can tag this one. The layout is 20x20 with 26 cuts. It's super hairy and hellishly loud but sounds cool. I don't know how to bias this one. The trimmers don't give you a lot of play with the voltage but they all behave the same way. The Bass control is not as dramatic as the Treble and Mids but everything seems to work as it should. Thanks Anders and Chris.

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    Replies
    1. Awesome news, Tom!!! And hellishly loud sounds like I need to build one, too!!!

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    2. Biasing is a bit unconventional. And It seems dirtier than the demo that I found. Be sure to report your results and opinions if you do build.

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    3. https://forum.pedalpcb.com/threads/figment-voltages.19431/

      Info about biasing. I set mine around 12v to get some extra dirt

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    4. Oh wow, my search turned up nothing. Thanks J. Good lookin' out.

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  3. Built this and sounds awesome. More gain than expected. Incredibly loud. I used an A50k for the Master to tame it a bit. May need an A100k pot.

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