How Does a Bias-Shifting Tube Tremolo Work ? - YouTube
Bias Modulating Tremolo Circuits
solid-state tremolo for tube amps… – notes to self
tube tremolo schematic for SE | diyAudio
Trem-O-Nator... more tremolo
Delta-Trem Tremolo-Panner In-depth - Effectrode
Stand alone tube tremolo
Guitar Tremolo Unit
HOMO ELECTROMAGNETICUS
Ultra Simple Tremolo (schematic and video) ///LeylandPedals : r/diypedals
RobRobinette Guitar Tube Amps - Here's an annotated schematic with the signal path for a more popular Gibson amp, the GA-40 version 3, 6V6 push-pull, 2 channel guitar amp with tremolo. | Facebook
Stand alone tube tremolo
Add Reverb & Tremolo
Stand alone tube tremolo
Vox AC30 - the Jennings vibrato circuit
Build Your Own Throbbing Vibrato, December 1957 Popular Electronics - RF Cafe