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Re: Kustom K100-5B [message #29156 is a reply to message #29155] Mon, 06 November 2023 08:11 Go to previous messageGo to previous message
stevem is currently offline  stevem
Messages: 4746
Registered: June 2004
Location: NY
Senior Member
Hello and welcome.
Unfortunately our schematic and amp list in our technical section is non functional once again , but if you PM me I can get you what you need.

This amp consists of 3 different circuit boards .
It has 4 PC105 boards .

1 PC803 which is the reverb mixer / send and recovery .

1 PC900
Preamp voltage regulation and output driver board.

With what you have posted about I would think that your issue is a noisy transistor, and it could be on the 803 board or the input side of the 900 board.

All the blue wires in the amp carry just the audio.

The blue wires going to the 900 board carry the audio so if you disconnect that from the 900 board you can start the process of elimination.

Note that if you need to back off the 900 board to work on it that a long lead diode goes from the board to a metal clip between the two output transistors and that these leads are very fragile, so don't go moving that diode around any more then you need to.

Until you have made 5 post to this site I will need to approve your post, after that they will just go right up.

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