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K200b-6 [message #21343] Thu, 04 September 2014 14:01 Go to previous message
Daytopper is currently offline  Daytopper
Messages: 7
Registered: September 2014
Location: Wake Forest
Junior Member
Hi, I'm a newbie to this Forum and look forward to being a part of what seems to be a pretty good one!
I received a K200 bass amp for repair and since its been a very long time since i've worked on Solid State amps, I'm somewhat stuck on this repair. The original complaint is noise and popping which I have not yet observed. During my initial testing I've noticed that the negative side of the output is clipping way before the plus side. I've done all the preliminary troubleshooting and all voltages both the high rails and the =- 8volts are on the money. I've tried to swap the 2 pairs of output transistors and clipped the diodes in the protection circuits and checked multiple resistor values to no avail. Am I looking at driver transistor replacement? Any ideas would be greatly appreciated.
Thanks
Kenny
 
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