VintageKustom.com: Repairing Kustom Amps

Re: k200b-3 questions [message #27187 is a reply to message #11684]

Sun, 03 February 2019 11:35

terminal
Messages: 20
Registered: June 2009
Location: GEORGIA

Junior Member

I have a K200B-3 and the selective boost switch pops when selecting different positions as well. In the right most position it actually pops repeatedly. It seems to work correctly in all positions (except that last one, the popping is too startling to leave in that position). popping makes we think of a cap, maybe C418 or C419? (only caps in play...) Is popping normal for selective boost ? (can't imagine it would be...)

My PC403 is 100% functional except for the popping on the selective part.

jccoombs, did you sort your K200B-3 out?

I also noticed a couple mistakes in the factory service manual (FSM) for PC403 (on this website). on the layout diagram Q409 and Q410 are flip flopped and on the schematic the top part of the boost frequency selector switch shows a line between C418 and R453. This shorts out whatever resistor is selected by the switch. I studied the traces on the board and this is in fact as error (otherwise, no need for the switch!).

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