Harmonic Vibrato and Spring Reverb Project. Circuit and Sounds

Harmonic Vibrato and Reverb Unit.
NOTE: Long video. Sound tests at the end.
Based on Fender designs from the early 1960s.
Circuit description.
Fender Harmonic Vibrato explained
Fender Spring reverb explained
2 spring vs 3 spring reverb tanks.
Modifications.
Full sound tests

[@MreViewer]

Nice work Nick. How did you arrive at the reverb bulb/resistor values, trial and error or was it based on an existing circuit?