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All of a sudden getting a hum in my system?

I am getting a hum that gets louder as you turn up the volume. I disconnected my VPI Classic One turntable and I am still getting the hum.I disconnected my three month old Manley Chinook and hooked up my old Belles 20A phono pre-amp and there is no hum. So the Manley Chinook seems to be the culprit. I called Manley Labs yesterday but they are closed until January 2.Any suggestions for resolving this problem would be greatly appreciated.
montgomery
rottenclam
59 posts
 
Hey Montgomery - your troubleshooting steps are very sound (plugging the Chinook into your buddy's system). I hope you resolve the problem soon. Please update us when you nail down what the exact problem turns out to be.
jorjen's avatar
jorjen
2 posts
 
Montgomery - any resolution to this issue? Response from Manley? Having the same problem and appears that my Chinook is the culprit.
markmaulhardt
1 posts
 
Hi Montgomery, Have you resolved your hum issue with the Chinook? I'm having the same issue with mine.
montgomery OP
29 posts
 

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?
newbee
4,767 posts
 
Loud pop's and hums usually are related to tubes and/or caps. With you unit's history it is probably caps. FWIW, it is recommended for any tube component user to have a spare set of tubes on hand so he can rule out tubes issues when problems occur. BTW with most tube problems you only hear the problem in one channel unless the bad tube is shared by both channels. It's under warranty so Manley should handle for you (again).

Re speaker oscillation - I assume that what you mean is that the woofer cone is moving in and out substantially but there is no apparent increase in bass. If that is so the typical problem is a mismatch of cartridge and tone arm (mass v compliance) which would be best resolved by getting the appropriate stuff in the first place, although it is possible to get a subsonic filter that would help reduce it. It is also possible to get a device to damp tone arm movement that might help. I had this problem many years ago and I traced it to the fact that my arm had damping capacity built in, all I had to do was add some fluid to the oil well.

Hope that helps a bit.
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