Bogen CHB-50 Rebuild

[physics]

The capacitive-coupled bias supply alarms me. I am in agreement with KOC that such bias supplies should be replaced with proper transformer-generated supplies, and a true independent bias-set network applied with cathode current-sense resistors for the output valves.

Could you expand on what alarms you? So far the issues I've found while digging around online/in TUT is that it may not be able to supply enough current in certain situations (like using BMK, or high grid drive) and that some amps have a reputation for blowing the coupling capacitor (Marshall something or other, with a plastic coupling cap). I agree that a transformer-based supply would be best, at the moment I'm trying to work out if it's necessary in my situation either for current supply capability or immediate danger (hence asking about why you're alarmed). Even if it does turn out that I don't need a higher current supply, is there any benefits towards building a higher current supply anyway, whether from a tone or robustness perspective?

Thanks for any info.