See V6, for tremolo in lower left of this schematic. Seems to be somewhat reminiscent of the Vibrolux 6G11 tremolo, though not identical. Check out the grid on V6 pin 2. There's a .01uF cap that connects to another .01uF cap. That second .01 does NOT connect to the .022uF cap coming off the plate (pin 1) does it? I assume it just connects to the 2.2M dropping resistor coming off the B+ right? And I assume the .022 (pin 1) just connects to the 220K resistor that's on the 3rd terminal of Rate pot (and to the the grid on pin 7, etc.). Is that what it looks like to you?