I lost the rectifier on my GetSetGo. I never had that happen before. Maybe a week ago, I thought I saw a flash of light from the 6AX5GT. I quickly turned the amp off, and started checking the output tubes. I had been swapping in different Sovtek 6B4G which I recently picked up from eBay, and suspected one was somehow bad. Couldn't spot anything wrong on the tube tester, so I powered the amp back up and everything was fine.
No problems for a week or so, then last night the rectifier started arcing again. I watched it *SNAP* a few times before I quickly hit the power switch. Scratching my head, not knowing exactly what to do, I replaced the RCA 6AX5GT with a GE. I thought maybe I should check a power supply cap to make sure it wasn't shorted or something, but was too lazy to actually do it. Everything seems fine again with the new rectifier in place. I've marked the old one as BAD.
While thinking about things, I observed the RCA seems to have only a single cathode in the center of the tube, with the two plates on either side. The GE appears to have two complete cathode/heater structures, and the plates are some kind of cladded copper material. Any comments?