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Home » VintageKustom.com » Repairing Kustom Amps » Kustom Bass III Channel 1 Hiss (extreme amount of hiss on channel 1 board (PC5127))
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Re: Kustom Bass III Channel 1 Hiss [message #28723 is a reply to message #28700] Fri, 29 July 2022 14:43 Go to previous messageGo to previous message
thespeakerport is currently offline  thespeakerport
Messages: 11
Registered: July 2022
Junior Member
Sorry for the delay in responding...been distracted with other repairs and finally circling back on this. To answer your questions:

When the adapter board was installed, were all of the old compensation parts removed from the circuit? - Initially no, but i did remove the ceramic caps around it and it did not seem to help. Not sure if other part removals are necessary, but that was all I had tried.

When the resistors were replaced, what kind of resistors were used as replacements? Carbon for Carbon...but for the 1% versions, i used metal film equivalents. They were not 1% replacements, but i tested the replacement and put in ones that were essentially as close to specified values as I could find.
I noticed on the schematic that there are a lot of 1% resistors specified. This is a common Kustom engineering trick that puts metal film resistors in the circuit to reduce noise and hiss.

Do the volume and clarity controls change the character of the his when they are rotated? - Yes they do.

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