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200 B-1 noise until warm? [message #6458]

Wed, 28 December 2005 00:42

BC
Messages: 583
Registered: March 2000
Location: Kentucky

Senior Member

I pulled a K200B-1 that I had not used in a while and found it makes loud BUZZING noise until the amp has been on 6-8 minutes. The treble tone controls on both channels seem to be related to the offenders, as closing them down helps to reduce it. After the amp gets quiet it seems to lack some of the power it should have. You guys know that I am about as technical as a wheel barrow....but, has anyone seen this before? BC Confused

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Re: 200 B-1 noise until warm? [message #6462 is a reply to message #6458]

Wed, 28 December 2005 08:53

stevem
Messages: 4863
Registered: June 2004
Location: NY

Senior Member

Go to radio shack and get a can off freeze spray, and with a hair dryer warm up and cool down sections of the amp and circuit boards. It sounds like a bad connection and you may be able to narrow down its loction like this. It could also be dirty switch connection on the input jacks if the buzz and hiss go away with all the controls on a channel down. Sometimes incerting and removing a cord several times from the jacks will do the job without pulling the amp out of the cab.

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Re: 200 B-1 noise until warm? [message #6463 is a reply to message #6458]

Wed, 28 December 2005 08:54

stevem
Messages: 4863
Registered: June 2004
Location: NY

Senior Member

PS. also tapping around in the amp with a chop stick can pin down lose components.

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Re: 200 B-1 noise until warm? [message #6465 is a reply to message #6463]

Wed, 28 December 2005 13:14

BC
Messages: 583
Registered: March 2000
Location: Kentucky

Senior Member

Thanks Steven! You are always there.....and much appreciated! BC Very Happy

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Re: 200 B-1 noise until warm? [message #6548 is a reply to message #6465]

Wed, 11 January 2006 20:34

BC
Messages: 583
Registered: March 2000
Location: Kentucky

Senior Member

Ran into the same problem on another B-1 head today. Rolling Eyes

Pulled the chassis and turned it on.....saw a spark on one of the terminals of one of the filter caps. TURNED IT OFF AND UNPLUGGED IT....then carefully loosened the screw....sprayed it with cleaner...cleaned the pots while I was there...checked the other screw trminals and put it back together. NO BUZZ! MANY THANKS FOR THE HELP! Cool

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Re: 200 B-1 noise until warm? [message #6549 is a reply to message #6458]

Thu, 12 January 2006 08:00

stevem
Messages: 4863
Registered: June 2004
Location: NY

Senior Member

going over all those filter cap screws is never a bad idea, as is the female spade connector that goes from the speaker output jack to the driver board. some terminal cleaner and protector spray like the detox brand is a good thing also.Cleaning and re expanding the A/C plug can make a difference too.The k100 I just got had so much tarnish and green copper tarnish crap on it I though it had the wrong pilot light bulb in it, it was so dim from the amp not having a good connection.

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