VintageKustom.com: Repairing Kustom Amps » K200B-2 tremolo is weak and pops when switched

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Re: K200B-2 tremolo is weak and pops when switched [message #26847 is a reply to message #26811]

Mon, 06 August 2018 19:33

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The vibrato switch buss is connected to the junction of R370 and R371. These two resistors are part of a voltage divider network that also includes resistor R369. One end of the resistor string is connected to the +8 volt supply and the other end is connected to the -8 volt supply.

There is normally a voltage on the switch buss until it is grounded by the front panel switch or by the footswitch.

The audio noise is caused by the switching of the transistors Q315 and Q316. One or both are probably switching into the circuit a partially charged coupling cap. Some make more noise than others. I always wondered if using an fet in place of the bipolars there would make them switch quieter.

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[Message index]

		K200B-2 tremolo is weak and pops when switched By: Saransk on Fri, 20 July 2018 13:44
		Re: K200B-2 tremolo is weak and pops when switched By: stevem on Wed, 25 July 2018 07:43
		Re: K200B-2 tremolo is weak and pops when switched By: Saransk on Sun, 05 August 2018 21:14
		Re: K200B-2 tremolo is weak and pops when switched By: stevem on Mon, 06 August 2018 05:53
		Re: K200B-2 tremolo is weak and pops when switched By: Saransk on Mon, 06 August 2018 13:21
		Re: K200B-2 tremolo is weak and pops when switched By: chicagobill on Mon, 06 August 2018 13:48
		Re: K200B-2 tremolo is weak and pops when switched By: chicagobill on Mon, 06 August 2018 15:04
		Re: K200B-2 tremolo is weak and pops when switched By: Saransk on Mon, 06 August 2018 16:36
		Re: K200B-2 tremolo is weak and pops when switched By: chicagobill on Mon, 06 August 2018 19:33
		Re: K200B-2 tremolo is weak and pops when switched By: Saransk on Thu, 23 August 2018 13:38

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