[Phil Allison]

"robert casey"

Looks like the circuit is expecting the diode to start conducting when the
voltage gets higher than the 3KV,


** If the R3000 diode (string) ever conducts in the reverse direction -
that is the end of the diode.

It is NOT a damn zener - you clot - the voltage limiting effect works by
transformer action.


BTW:

There are in fact several ways in that Fender amp the R3000s CAN cop more
than 3 kV in reverse, both at the same time.

Then it is kaput for one of them.

See if you can figure even one of them out.



......... Phil