This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Thursday, June 25, 2015

Catalinbread Galileo Mk. II

The Catalinbread Galileo emulates an Vox AC30 and a Rangemaster treble boost in one to give the user tones like Brian May of Queen. The Galileo Mk. II differs from the Mk. I with fewer controls and in a much more pedalboard-friendly enclosure. It's a bit stripped down from the original, but sounds fantastic, and some say it's easier to dial in tones on the Mk. II over the Mk. I. Comparing the schematic with the Catalinbread Sabbra Cadabra, the Galileo has a very similar structure. The input stage is similar (though not identical), the stacked JFET gain stages are nearly identical, as is the gain recovery stage after the tone control. Though, this makes sense since both are emulating British tube amps and Rangemaster variations. To board mount the pots, use right angle PCB mount types from the solder-side.


12 comments:

  1. Hello, I can replace the MPF4393 by J201?

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    1. For alternate transistor could be replace with 2N5457, mine with 2N5457 and sounds good too.

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  2. Hi. Thanks for doing this layout. Where can I get the schematic though? Thx.

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    1. It's over on FSB: http://freestompboxes.org/viewtopic.php?f=7&t=26282&hilit=galileo

      If you can't find a schem for one of my layouts on google, look over there.

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  3. Hi dtgehring, built this today and although it sound great, the tone is almost useless passing 10 o'clock. Too much treble. Is that normal? There's a way to correct this? I'm using 2N4393. Thanks.

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    1. I haven't built one myself, but maybe try using a lower value pot for the tone control. 500k is where I'd start.

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  4. Thanks so much for this lay out. Just finished this build with 2N5457's and it sounds awesome! Nice throaty sound. The gain pot works backwards though so I think I will desolder that mounted pot wire it.

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  5. whoops, my mistake, just noticed I made a mistake in the pot numbering

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  6. I build Catalinbread Galileo II with 2N5457.. Works good.

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  7. No 470k resistor on gate Q2 (100k, 68k)

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