Fender 5F11 trem circuit

[Randall]

Can someone help explain how the 5F11 tremolo circuit works? I see it involves half of the first 12AX7 and the bias voltage gets to the 6V6s via the depth control, but I don't fully understand how it oscillates.

http://elektrotanya.com/PREVIEWS/634...5f11.pdf_1.png

[nickb]

I started to write an explanation but Aiken does it better

[Jazz P Bass]

It is a low frequency phase shift oscillator.

The trick is the caps that feed back into the grid.
Over & over again.

Lots of good explanations here:
https://www.google.com/?gws_rd=ssl#q...req+oscillator

[Jazz P Bass]

It is a low frequency phase shift oscillator.

The trick is the caps that feed back into the grid.
Over & over again.

Lots of good explanations here:
https://www.google.com/?gws_rd=ssl#q...req+oscillator