Do you think that reverb pedals change a guitar's tone and not just add reverb?
spring reverb analogue predelay "design" | GroupDIY Audio Forum
How to build your own spring reverb unit | Guitar.com | All Things Guitar
DIY Reverb Pedal Circuit: Spring-Hall Reverb with PT2399 IC – Deeptronic
Add Reverb & Tremolo
GuitarPCB Add-Verb Reverb Pedal Kit by Pedal Parts and Kits
Build Your Own Spring Reverb | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.
How to build your own spring reverb unit | Guitar.com | All Things Guitar