crazydoc
Master Baiter
It's still a little hard to read the schematic, but it looks like C7 is 4700P, which would be 0.0047uF, and C5 is definitely marked 0.47uF on the schematic. C7 passes the high frequencies, and when you switch in C6(?) this would pass the lower frequencies, and I'd expect this to be a larger value. What value is C6(?), the one in series with the switch S4?
Since the supply voltage is rated at 33V, I'd expect that 50V caps would be adequate.
Since the supply voltage is rated at 33V, I'd expect that 50V caps would be adequate.