I've finally finished my valve vibrato unit; the "Worthington Vibrotron"! Inspired by the articles on
www.thermionic.info, I've always wanted to try out a true vibrato effect.
I happened to have a small 150V tranformer that didn't seem much good for an amp, so I created this instead using a pair of ECC81s and an ECC82 (because they're cheap, like me). Seems to work pretty well, especially on high freq' settings. When set to "Trem" only, you can get almost a stutter effect- the waveform looks pretty cool! One nice feature of this is that the indicator LED flashes in time with the oscillator. Now all I need is some sort of grill for the front and back.
Pics & Schem:
http://s81.photobucket.com/albums/j2...owe/Vibrotron/
Clips: (I think you have to copy and paste these addresses into your browser by hand)
Vibrato:
www.freewebs.com/valvewizard1/Vibe.mp3
Tremolo:
www.freewebs.com/valvewizard1/Trem.mp3