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K200A has hum/low output [message #9820]

Thu, 30 October 2008 21:00

ellum68
Messages: 71
Registered: November 2007
Location: Sioux City, IA

Member

Just got a K200A-2. It worked alright for a few days until this afternoon. I flicked it on and was greeted by a mild hum and greatly reduced output. The low output is on both channels. I was thinking something in the power amp or power supply portion of the amp. The amp never had the "thump" that my B models do when I turned it on. It does have a thump when turning it off. Also, the volume controls on both channels acted different than my B models even before these problems. My B models would be very loud right off the start and continue from there. This amp wouldn't start to get LOUD until just before the very end of the pot's sweep. Of course, I'm new to this A model game as well.

Any suggestions on what to check out? I'm supposed to have a new Fluke 179 DMM show up any day and will be able check on things. My electronics knowledge is so-so. I built a 5F2 Fender princeton, so I know well enough not catch the business end of a power supply cap, but will still pretty much have to be told in detail where to measure or check at. Thanks guys!

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[Message index]

		K200A has hum/low output By: ellum68 on Thu, 30 October 2008 21:00
		Re: K200A has hum/low output By: stevem on Fri, 31 October 2008 08:00
		Re: K200A has hum/low output By: ellum68 on Fri, 31 October 2008 11:33
		Re: K200A has hum/low output By: chicagobill on Fri, 31 October 2008 12:12
		Re: K200A has hum/low output By: ellum68 on Fri, 31 October 2008 19:53
		Re: K200A has hum/low output By: stevem on Fri, 31 October 2008 12:11
		Re: K200A has hum/low output By: ellum68 on Fri, 31 October 2008 22:14
		Re: K200A has hum/low output By: chicagobill on Sat, 01 November 2008 12:23
		Re: K200A has hum/low output By: ellum68 on Sat, 01 November 2008 17:58
		Re: K200A has hum/low output By: ellum68 on Sat, 01 November 2008 18:25
		Re: K200A has hum/low output By: stevem on Mon, 03 November 2008 06:26

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