AC30 - Filter Cap Effect?

[dbun]

I've got a Hayseed 30 (essentially a 60's AC30). I had it serviced recently and my tech wanted to increase the filter cap values.

What tonal effect does the filter caps have? I don't really want to go swapping things out on a whim, as I really like the amp as it is.

I am fortunate that the church I play at has an isolation room with isolation boxes backstage for guitar amps, so I can play the amp cranked right up. He said that if I play with the amp cranked (as I do) then bigger filter caps will work better.

What should I do?

 

[drbob1]

He's probably referring to the problem Vox amps have with ghost notes when cranked ( a dissonant sound in the background). Increasing the choke and filter caps might help, but there's no free lunch-double check with Hayseed to see if the PT can tolerate the bigger cap load.

 

[dbun]

Thanks for the reply.

I'll double check, but the trannies on the Hayseeds are HUGE, so I doubt there would be any issues.

Even the tech was surprised at how big the trannies were....and was also impressed with the build quality of the amp

 

[pdf64]

For instrument amps, it's generally tube rectifiers that impose a constraint on the reservoir cap value.
If you can't hear ghost / wolf notes when the amp is cranked in an isolation booth, then I can't perceive benefit in a mod to fix a non-existent problem.
Pete