During the process of building a ReVibe, a discussion has sprung up where a few of us either want to know, or are helping to explain, how the variants of the Fender Harmonic tremolo work. @keithb7 asked about the 6G8-A, and here's @clintj's great explanation: I'm just hoping to learn more, and in that spirit, I'm posting the 6G8-A schematic, with the bare bones markup of what I think Clint said. I'd appreciate it if others would flesh it out a bit further, along the lines of @robrob's fine signal trace / markups of the Deluxe and the 6G15. To demonstrate the limits of my knowledge, I had to look up "cathodyne". And I think I just learned about cathode followers yesterday (you tell me). For instance, and I know this is standard Fender, but how exactly do those three caps create the LFO? Basically - and I hope I'm not the only one - I'm interested to know what each component does, beyond standard coupling caps, and tube current and signal flow.