Friday, 10 December 2021

Chase Tone Secret Preamp

 Per request.

Schematic is avaiable HERE.




17 comments:

  1. Built mine and the volume control attenuates when turned up & down. Looking at the schematic, I think swapping the Output & Volume 3 will fix it.

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  2. Can confirm, swapping the Output & Volume 3 rows makes it work great!

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    1. Thanks for verifying and correcting the connections. Tagged!

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    2. @CrackinTheShat are you getting 22V after the zener on this? I'm only seeing 9V. @fuzzhead Notice anything that might cause this? Thanks!

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    3. Hmm, the layout looks good to me.:-/

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  3. ow, I think on the trimmer legs 1 and 2 needs to be connected and not 2 and 3...

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    1. Yes, thats right. But the trimpot will fullfil the same function,it is just reversed. I'll move the link as soon as I can.

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  4. Is the above layout up to date? I intend to build as soon as I receive the parts, but be in doubt because the schematic indicates the jump between terminals 1 and 2. Could you clarify this humble amateur?

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  6. The toggle spdt on off on doesn't change the tone for me stays the same no matter what setting

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  7. Hi Fuzzhead!I hope you are well!I cannot find a 22v zener...Can i use something else?

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  8. HI guys build this but cannot seem to have any change when engaging the effect. I get 21 volts on row K, 18 volts at the trimpot/zener. What is wrong?

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  9. Hi guys
    Forgive me but I'm new to these experiments.
    I'd like to try my hand at building this preamp but I'm not a great electronics expert so I ask you, if possible, the complete layout of connections to the various pots, jacks and switches?
    Thank you so much

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    1. Here is a diagram for how to handle your off-board wiring!
      http://tagboardeffects.blogspot.com/2012/02/offboard-wiring.html?m=1

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  10. Hi! can i use a 20v or 24v zener diode here? I don't have 22v...

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    1. The Zener is part of the power circuit, and is there to knock the current down from 26V. If you don't have any caps that are rated over 25V, I'd use the 20V Zener to make sure you don't get too close to blowing anything. If your caps are rated 35V or more, then either the 20V or 24V Zener should be fine.

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