Home » VintageKustom.com » Repairing Kustom Amps » Kustom Bass III Channel 1 Hiss (extreme amount of hiss on channel 1 board (PC5127))
Re: Kustom Bass III Channel 1 Hiss [message #28696 is a reply to message #28683] Sat, 23 July 2022 06:16 Go to previous messageGo to previous message
stevem is currently offline  stevem
Messages: 4733
Registered: June 2004
Location: NY
Senior Member
That does not mean you can't have a bad new component!
I have had this many many times over the years, and to get to the bottom line on this all there are only two things that will add hiss into a audio stream .

1) a bad semiconductor.

2) a noisy resistor.

Maybe although you have changed out tons of resistors, maybe you put on a wrong value by a factor of 10 and now you have too much gain?

One thing is certain if you signal trace thru the circuit you will for sure find the source of the hiss, you could even do it the cave Man way by process of elimination of cutting circuit traces open!
 
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