Moving on from the Valve Caster, and as recommended by Neil McNasty, here's Rick Holt's Vibracaster.
The tube components are very similar, but the Gain, Tone and Volume controls have been removed and components selected for unity gain and a simple LFO added.
There are lots of mods suggested for this on diystompboxes but I've just based this on the original schematic Rick posted for the 12AU7 tube. The mods should largely be easy to implement if anyone wants to, it's a pretty simple circuit and even with a few extra rows or columns added it should still be 1590B friendly.
When someone builds it will they post a vid on youtube so I can add one to this post. Ta! :o)
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