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Re: Fired up my Kustom Amp For First time in 20+ Years [message #26691 is a reply to message #26682]

Tue, 08 May 2018 05:53

stevem is currently offline

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Your amp has reverb, and in that model it hangs off the roof of the amp so you will need to unplug the rca cables feeding it and use a maker to note which side of the pan they get plugged back into.

No harm will come if you plug it back in wrong, but the reverb will not work well.
Also note that on the center of rear wall of the amp are the output transistor and there bias resistor network.

Even if it turns out your hum issue is not from having a bad transistor , these resistors can go way way off in value due to age , and they need to be dead on !
If they are not the amp can loose some 35 watts of its clean output power.
In light of this I would remove the one of the big tall power supply can filters to gain access to the resistors and unsolder one leg of each resistor and compare its reading to the amps schematic that can be found on this site.

And like Bill posted a D.C. Voltage found at the output jack is not good , the problem is that if you have a loud hum then that is a large D.C. Voltage ( like over 20 volts) and that can blow a speaker on you!
Please report back with your findings..

[Updated on: Tue, 08 May 2018 06:03]

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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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