'79 Silverface Deluxe Capacitor Question

[Johnrcurry]

I’m having more problems with my Silverface Deluxe Reverb. I replaced the five filter capacitors and the associated resistors. All seemed well. The amp powered up and played fine with a 5Y3 rectifier tube. I inserted a new 5U4GB rectifier tube and turned on the power. The tube flashed with a white light and I immediately turned it off.

I put the old rectifier tube back in and the amp powered up normally. When I played, however, it sounded raggedy and distorted at low volume. I began looking into things, removed the cover on the filter capacitors and found the inside of covered with a dusting of silver particles. I suspect one or more of the capacitors has failed. I’ve included some pictures below. Does it look like a/some capacitor has failed? Is it possibly related to the rectifier tube fault, or just a coincidence?

Thanks for your help.

[Jazz P Bass]

I think the first picture shows the error.
The first cap on the left appears to be backwards.
The cap next to it has a bad solder joint on the top lead.
Link: http://i270.photobucket.com/albums/j...dmaster007.jpg

Compare the board to the schematic.

[Johnrcurry]

Jazz P, thanks for your reply. I've checked the schematic and it seems to show those first two caps in parralel with the negative ends going to ground. Also, I believe this is the way the original caps were wired. I've attached the schematic and a "before" photo. I can't tell what am I missing?

Thanks

[Jazz P Bass]

O/k, so yank all of the tubes & take some of the major node voltage measurements.
(with a known good rectifier installed)
The 5U4 "may" have took a dump.