Help me fix my blackface Princeton reverb

[Scratie_82]

Hey man brand new here I just bought a very nice 66-67 bfpr it sounds great but a very loud hum been told its a capasitor just need to know wat u guys think
And maybe how to check I don't want to change wat I don't have to for resale purpose I'm quite aware of the recap or not to recap wars but I could Shure use some help bad thanks much
Scott

[andyfromdenver]

Originally Posted by Scratie_82

Hey man brand new here I just bought a very nice 66-67 bfpr it sounds great but a very loud hum been told its a capasitor just need to know wat u guys think
And maybe how to check I don't want to change wat I don't have to for resale purpose I'm quite aware of the recap or not to recap wars but I could Shure use some help bad thanks much
Scott

Stab in the dark but: is the loud hum present with no guitar plugged in? If yes, probably need to retention input jacks. Check by plugging guitars in both inputs and turning guitar volume off, if it got quieter that would confirm.
My friend did a cool grounding mod on mine to make it graveyard quiet, it's simple but hard to explain over internet.
Any interested buyer who knows something and deserves the amp will appreciate a cap job and grounded cord. It may be up to you to educate in your listing :)
Good luck!
First thing I would do is make sure tubes were properly seated and correct to schematic and that the fuse is correct. Person before you may have done who knows what. Are the tubes original? That'd be nice :)

[Robster]

It needs a filter cap replacement. Its the silver cylinder that kinda looks like a tube hanging down. Any repairman can fix it easily.

[Scratie_82]

Thanks guys so much yea it does hum with no guitar plugged in I'll check my inputs now one thing I noticed and don't know if it means anything is when I pulled the head out and checked the can for power without draining it it only had like 1.156 vlts and on the positive side of blue moldedl caps on the inside they also had 1.156 all but one of them wonder if it could be that one. And if I were to try to order the can cap what would I look or ask for and where should I look. thanks guys

[telex76]

Filter cap can in need of replacing can cause some nasty sounds, but a hum could be anything.
The cap can is old and should be replaced, but may not fix your hum.
Tubes and more (Antique Electronic Supply) has your can.
http://www.tubesandmore.com/products/C-EC20X4-475

[Scratie_82]

Yea thanks guys took it to shop today wound up being the bias cap thanks so much