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HT Soloist 60 making a loud popping

Posted: Tue May 14, 2019 3:14 pm
by maedabr
Hi all,

I have a blackstar ht soloist 60 for more than 3 years and few weeks ago the amp turned off by itself. I opened it and saw that one diode and capacitor from rectifier bridge had burned it out (D22 and C144 - schematic attached here). These bridge capacitors are 10n 500v, but I didn't found these capacitor with the same voltage so I replaced them by 10n 2kv instead.

Now the amp is making a "hum" noise (i'm not sure if it's 60hz or 120hz) and loud popping. I recorded that sound at ... em/s-4Yc3u
This defect get start happening after some minutes, maybe something between 5 and 20 min.

Do you know what could be the problem now? The power tubes? Should I consider replace all filter capacitors? I already replace one of them (C138) but they are expensive here in my region and I'm not sure that they are damaged.