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Re: Fired up my Kustom Amp For First time in 20+ Years [message #26696 is a reply to message #26682]

Wed, 09 May 2018 00:10

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The three volts on the speaker would cause the hum that you are hearing. Your tech should check all 4 output transistors and the four biasing resistors that are connected to them, 820 ohms 1 watt and 8.2 ohms 1/2 watt.

The effects board should have a light bulb and a cds photocell to make the vibrato work. They are enclosed in a heat shrink tube. If either is missing, the vibrato will not work.

While you have the meter out, you should read the voltage across the two main filter caps. You should get plus and minus 40 volts dc or so. The last voltage test would be the preamp power supply voltage which should be around plus 25 volts dc. It is generated on the driver pc board on the rear panel. If you look at the bottom edge of the driver board, there are two or three wires that connect the driver board to the effects and preamp board. I think that the red ones will be the 25 volt lines.

The ink pen numbers on the edge of the chassis are the factory codes when the chassis was built. One fellow here figured out what they all meant and could date the chassis by reading them. He hasn't been around here recently, but if you list the serial number, somebody will be able to give you an estimate as to when it was built.

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[Message index]

		Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Sat, 05 May 2018 21:18
		Re: Fired up my Kustom Amp For First time in 20+ Years By: stevem on Sun, 06 May 2018 06:08
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Mon, 07 May 2018 12:46
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Mon, 07 May 2018 12:49
		Re: Fired up my Kustom Amp For First time in 20+ Years By: chicagobill on Sun, 06 May 2018 14:39
		Re: Fired up my Kustom Amp For First time in 20+ Years By: chicagobill on Mon, 07 May 2018 19:04
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Tue, 08 May 2018 08:32
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Tue, 08 May 2018 22:22
		Re: Fired up my Kustom Amp For First time in 20+ Years By: stevem on Tue, 08 May 2018 05:53
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Tue, 08 May 2018 22:29
		Re: Fired up my Kustom Amp For First time in 20+ Years By: chicagobill on Wed, 09 May 2018 00:10
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Wed, 09 May 2018 08:11
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Wed, 09 May 2018 08:13
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Wed, 30 May 2018 21:01
		Re: Fired up my Kustom Amp For First time in 20+ Years By: stevem on Thu, 31 May 2018 06:19
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Thu, 31 May 2018 15:02
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Thu, 31 May 2018 15:04
		Re: Fired up my Kustom Amp For First time in 20+ Years By: chicagobill on Thu, 31 May 2018 15:45
		Re: Fired up my Kustom Amp For First time in 20+ Years By: B-Dubs on Thu, 31 May 2018 16:16

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