Wiggle Wobble

Out of all the subminiature tube projects this one takes the cake. It's a tube powered vibrato, and it's lush as fuck! In the notes it says that by omitting one of the trace cuts you can get more of a tremolo effect, in retrospect I think this would be better implemented via a switch to connect/disconnect the trace cut therefore giving two effects in one. This circuit is a two part build and will not operate without a secondary 'LED' circuit to drive the LDRs. You can use any LED circuit you'd like however I found that a smoother fluctuation(fade) as opposed to choppy(blink) is more desirable in the actual behavior of the LED(s). Rick Holt who originally designed the circuit used a transistor based LFO, in my personal build I used the phase shift oscillator found in the Magnavibe pedal. I'll post a few layouts for the phase shift oscillator(PSU) that I used in another post.

Back And Forth

A subminiature tube tremolo pedal using the 5672. It adds quite a bit of boost and "grit" to your tone as well but still makes for a great effect. It lays somewhere in-between Tremolo and Vibrato. A very similar sound as the Bigfoot Magnavibe, for a modern reference. Rick Holt/Frequency Central posted the schematic on a forum somewhere deep in the mid to late 2000s and this is a part for part layout of that original schem.