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CARVER PM-1200 Amplifier excessive buzz

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vyee

Newbie

Posts: 3

Joined: Tue May 19, 2009 7:48 am

Post Tue May 19, 2009 10:40 am

CARVER PM-1200 Amplifier excessive buzz

My PM-1200 amplifier has a significant buzzing noise that is very distracting. After taking off the cover, I have concluded the hum is coming from the transformer. Any suggestions for at-home repair? Or should I merely leave it to the pros to serivice it?
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thuffman03

User avatar

!! CarverFest Evictee !!

Posts: 2706

Joined: Fri Sep 19, 2008 10:07 am

Location: Pittsburgh, PA

Post Tue May 19, 2009 12:09 pm

Re: CARVER PM-1200 Amplifier excessive buzz

Unless you are good with electronic repair I would send it off to Bob and Rita to have repaired.
Some cool Carver stuff!
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gary_wong5

Newbie 50+

Posts: 70

Joined: Fri May 16, 2008 8:17 pm

Post Wed May 20, 2009 7:26 am

Re: CARVER PM-1200 Amplifier excessive buzz

My TFM-45's left side was always buzzing and very annoying. However, the buzzing noise disappear after I tried connecting a single wire from CD player<---->preamplifier. What a wonderful day. \:D/
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donberry

Newbie

Posts: 45

Joined: Wed Jan 28, 2009 2:32 pm

Post Sat May 23, 2009 10:06 pm

Re: CARVER PM-1200 Amplifier excessive buzz

I could be way off base here so take this with a grain of salt, do not even know if this is your problem, but may be worth a shot.
Could it be a ground loop hum ? I had a really bad hum on a Crown DC-300A II amp I have and checking around about it, came across an article somewhere that recommended using a multi-strip, where it was just plugged straight into the wall.
Again, do not know if that is your problem, but it did work for me, went to a mult strip and the problem went away(when I say a multi strip, I am just talking about those power strips with multiple plugs on them, so you can plug 500 things into one outlet)
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BillD

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(pair of) SILVER-7 TUBE AMPs

Posts: 7295

Joined: Wed Jun 06, 2007 8:29 pm

Location: The west's most mid-western town, Scottsdale, Arizona

Post Wed Jan 06, 2010 8:23 pm

Re: CARVER PM-1200 Amplifier excessive buzz

Sometimes buzzing is because you are drawing too much current. Check you bias adjustment and rail voltages.
It should sound like it isn't there!
There is a difference between hearing and listening...
Making life enjoyable through expensive electronics.
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Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer
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birdyman

Newbie

Posts: 21

Joined: Sun Apr 26, 2009 7:52 pm

Post Wed Jan 13, 2010 10:24 am

Re: CARVER PM-1200 Amplifier excessive buzz

Can you disconnect everything and see if you still hear hum? If you do your amp has problem. If disconnecting solves problem, you have ground loop. Ground loop can be from : not limited to, cable box, cable or dish TV, long line to projectors, long line to subwoofers...etc. You just need to reconnect one at a time to see culprit. Let us know what you find. I hope this help.

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