Max UF for 5Y3 Rectifier

[jlatrace]

I need some help clearing up conflicts in my research concerning the UF tolerance for a 5Y3 rectifier tube I am using in a single ended DYI amp design. My reserach finds conflicts in the typical operatiing (or maximum) UF specs that range from 10UF to 20UF (maximum).

Conflicting with this I find the Fender Bronco schematic (40UF) and many posts at variance sites (up to 47UF).

Can you give me some guidance on determining the maximum, or a rule of thumb?

I have prototyped a single ended amp and want to boost the UF at the rectifier stage. I have tried values as high as 47UF with good result, but am concerned that I might eventually have rectifier arching or failure.

[MWJB]

50uf is safe as houses, some use 100uf.

[jlatrace]

Great and thanks. I have learned to rule out as many potential issues pre-build as I can to help me later when troubleshooting.

PS-You have helped me several times over the last year, I really appreciate your current and past help.
Les

[MWJB]

You're welcome.

[Enzo]

And in general it is good to keep in mind that what you are supposed to do and what you can get away with are not usually the same thing.

[jlatrace]

So 50uf you can get away with, regardless of whether one is supposed to or not?

The amp really rocks using the 47uf cap. It's amazing what a small change in the power section makes in certain amps.