All of a sudden getting a hum in my system?

Thanks for the responses.Everything seems to be grounded properly. I have not moved anything or plugged something into another circuit. My home theater system is in another room and I do not have cable. I am taking the Chinook to a friends today to see if it hums when connected to another system.I will talk to a Manley Labs tech before experimenting with cheater plugs or RCA shorting plugs.

Just connected the Chinook to a friends system and the hum is still there getting louder as you turn up the volume.I guess the only thing to do now is to call Manley Labs and see what they suggest.

I have not tried changing tubes.I will talk to a Manley Labs tech about changing tubes. I am new to tube equipment so I don't have any extras lying around.

Sorry for the late response but I have not visited Audiogon in awhile.
I sent the Chinook to Manley and they said the problem was with a capacitor.So with insurance that cost me over $90.00 which is not covered by the warranty to have a capacitor replaced.
I got the Chinook back and it was working alright for awhile.But several times recently while playing a record I am getting some loud pops followed by a loud hum from my speakers.Also several times recently I have noticed speaker oscillation as soon as the needle hits the record,this is before the music starts.
Is my Chinook a lemon?

Manley sent me a new Chinook a year ago.After about a month I started getting an occasional pop and hum. It has occurred three times in the last three weeks so I e-mailed the Manley service department today.My first experience with tubes has been a frustrating one,but I do love the sound.My advice would be to e-mail ManleyLabs.com. Good Luck!