| K200B [message #26029] |
Wed, 05 April 2017 08:18  |
stevem
Messages: 4775
Registered: June 2004
Location: NY
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Senior Member |
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Irish77960 had contacted me by pm about a issue with his amp.
He had installed a brite switch in one of the preamp boards that I provided him and things where fine.
While playing the amp he turned it up louder , played more and then heard a loud pop and lost output, but the strange thing is that the pilot lamp was still responding normal to his playing by dimming which is something I have never seen before!
So far in trouble shooting this issue I had him check the output from the amps RCA jack where he said that there is a screaming loud sound coming out if the jack.
My guess at this point is that one of the preamps is oscillating.
Irish77960 , at this point we neeed to pin down what's going on , and I would say that the thing to do is to unhook the Blue audio output wire from each preamp one at a time to see if atleast one channel is working normal and report back.
[Updated on: Wed, 05 April 2017 08:20] Report message to a moderator |
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| Re: K200B [message #26032 is a reply to message #26029] |
Mon, 10 April 2017 17:06  |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Member |
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Steve,
Sorry it took me a minute to get this done. So, I plugged it in and turned it on before performing any of the tests. Dang. It worked. Plugged in a bass and sound from all channels. The light still dims a little when a note is hit, bit I could not recreate the same scenario I wrote you about. I'm baffled. There is a good amount of hum, more than my other K200b, but all channels, all tone adjustments, and bride switches working. This amp, along with another that Bill has helped me with are possessed.
Keep On Truckin'
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| Re: K200B [message #26035 is a reply to message #26033] |
Wed, 12 April 2017 11:02 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Member |
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Black QTips. Lots of crap. Turned it on and the static was gone, just a very low audible hum. Hit a note, was good. Then blew a fuse. A new one in tonight. Luckily I bought a few before starting on these amps!
Keep On Truckin'
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| Re: K200B [message #26036 is a reply to message #26029] |
Wed, 12 April 2017 12:27 |
stevem
Messages: 4775
Registered: June 2004
Location: NY
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Senior Member |
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Fuses in these amps are soldered in and for a reason, is yours still that way?
If not that's a sign that the amp has issues that likely have not been corrected seing as you blew the fuse, this of course assumes that the fuse that blew on you is the right 3 amp fast blow type.
[Updated on: Wed, 12 April 2017 12:30] Report message to a moderator |
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| Re: K200B [message #26037 is a reply to message #26036] |
Wed, 12 April 2017 15:52 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Member |
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Yes, soldered in. And it is/was the correct one. 3.0 fast blow.
Keep On Truckin'
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| Re: K200B [message #26038 is a reply to message #26037] |
Wed, 12 April 2017 21:00 |
irish77060
Messages: 49
Registered: January 2017
Location: Atlanta, GA
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Member |
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Ok, in 40 years of playing through Kustoms, there's a first time for everything. When I desoldered the fuse, the end fell off the glass tube. Just slipped off. Never seen that before. May keep it just to prove it to someone.
Fuse in, all ports jacks and pots squeaky clean. Silent. No hum or buzz. Nothing but guitar sounds.
The lamp situation is just a little weird. It's steady illumination until the volume hits 90%. Then it dims slightly when a note is hit. My guess is the old caps. Although they are working very well now.
Keep On Truckin'
[Updated on: Wed, 12 April 2017 21:02] Report message to a moderator |
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