Sunday, 22 October 2017

Castledine Electronics The Wizard

From the source:

The Wizard is a new distortion pedal, inspired by Tony Iommi's guitar sound on the early Black Sabbath albums. It is well known that he used a modified Rangemaster to drive his amps, so the same principle was used for The Wizard. The first gain stage is essentially a Rangemaster, using a germanium transistor, but tweaked for a full range boost. That drives a distortion circuit which has been designed to give something of the tone and feel of a Laney Supergroup amp. Obviously, there is no substitute for a full stack at volume, but The Wizard has a similar distortion character and responds well to picking dynamics.





14 comments:

  1. Thanks Zach/rocket88. This is the pinnacle of iommi tones from the average amp and I salute toy for the valiant effort

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  2. This is great!
    We don´t need to worry about drain bias resistors here, right?

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    Replies
    1. Nope. The FETs are setup in a mu amp arrangement so no worries about biasing the drain of the FET.

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    2. Thanks for the layout Zach. I built it and everything works but it doesn't seem quite right. Output volume is low just barely reaching unity fully cranked. I used a 130 Hfe MP38A Russian germ for Q1.

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    3. The version i built from the forum also has low output volume. I did notice that seems to be the way it is from watching YT vids though.

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    4. That 470k resistor before Volume3 is asking for a downgrade then, I think...

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    5. Yep, swapping 470K to 100K made a very positive improvement for me. Thanks trapiak!

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  3. I ordered some 2n1308s.
    In the mean time, could I just drop a silicon npn there ...?

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  4. MP38 vs MP21A as replacement for germanium CV7351?

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    Replies
    1. MP38A is a solid device and usually comes in higher gain ranges than MP21A. I'd go with MP38A. Both are definitely better than the original when it comes to temperature changes.
      +m

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  5. Looking at the layout, I think we can skip the board J-12 cut.

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