At long last - the SupraTweed

[Ge_Whiz]

Well, it eventually got finished - ROG's 'Supreaux' and 'Prof. Tweed' emulators together in one box. Huge options for switchable blues / rock rhythm and lead tones. Wasn't impressed by the 'Supreaux' at first - then I found the 'unbroken track error' on the veroboard layout. After that - glorious tones all the way.

And yes, the centre LED switches between red and green to indicate each emulator circuit.





Thanks again to Brian and Gary of the Runoffgrooviness.

[MartyB]

Nice build Ge_Whiz!  I like that idea of combining amp sims into a single box.

[toneman]

B  L  U  E  L  E  D......
Ow...my eyes....
nice recycled box!!

[Peter Snowberg]

That's beautiful and a stroke of genius too!

[petemoore]

I bet....looks great !!!
 Battery holder is interesting looking, did you play hell diggin a hole out to install it in?

[Ge_Whiz]

Thank you, thank you.  

Whaddya mean, 'recycled box'? Are you suggesting that if I'd chosen the box, I'd have built it smaller? No way. This was designed to look and sound BIG!

The battery holder was no big deal. The box is diecast aluminium, which cuts easily with an 'abrafile' sawblade (an abrafile is a blade which fits in a small jigsaw handle and can cut in any direction, for those who haven't discovered them yet). I mark out the rectangle, drill a pilot hole for the blade in one corner, then cut roughly around the rectangle, finishing off with a metal file and finally needle files to get the fit snug. No more fighting screws to get the back off when the battery dies. The two emulators pull 1.8 mA current; the LEDs pull 15mA!

A couple of build notes: once again, I used 2N5457 FETs throughout. They possibly give the Tweed rather too much gain, but it still cleans up nicely. I socketed the Tweed feedback capacitor, but ended up preferring the tone of a 1uF NP. With the Supreaux, as I have commented for the English Channel and Matchbox, I found the 4.7nF tone capacitor to be too small and raised it to 15nF.

The combination is much more versatile than I anticipated. I thought that one would clearly declare itself to be a better 'rhythm' channel and the other a better 'lead' channel, but each can do both tasks; I'm still finding 'sweet spots' all over the dials. Recommended.