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If you are really concerned about this, then using a higher voltage cap than necessary is counter productive as a higher voltage rated cap will have higher equivalent series resistance (ESR) which is the main parameter that determines the quality of caps with respect to reducing ripple; a higher ESR means less ripple is shunted to ground through the cap.
Regardless, I'd be surprised if you hear than much difference, assuming that the old cap is working correctly.
What position in the circuit is this cap? It’s likely that increasing the value will make far more of a difference than a different brand, if the cap is the problem at all.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Rift Amplification
Brackley, Northamptonshire
www.riftamps.co.uk
Can you tell whether the hum is at 50Hz (possibly heater supply) or 100Hz (suggests HT)?
I'm not familiar with that amp but having looked at pics, at a guess it will be something like a 5C2 Princeton circuit, in which case both the first two filter caps would be 8 or 10uF. I would definitely try increasing the value of either the first or both to 16uF or 22uF.
If you don't want to modify the amp until you're sure, you could temporarily attach an extra 10uF cap in parallel with one of them using croc clip leads, or just temporarily wrap the leads of the new cap around the existing one - be very careful to discharge them fully before connecting or disconnecting, the simplest way to do that is pull the rectifier valve and turn the amp back on for a minute or so.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Ooh, an old Valco design!
This would have been a student model amp for home use, so there would be no expectation that it would have low background noise when cranked.
If you're doing that, ideally you should move both it and the HT centre tap (red/yellow) to a grounded tag on one of the transformer bolts, and the mains earth to a separate tag that isn't used for anything else. That won't affect the noise but is more compliant with electrical safety regs.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein