Kustom K100-5B [message #29155] |
Sun, 05 November 2023 18:25 ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
retrorod
Messages: 5 Registered: June 2012 Location: Outer Banks, NC
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Junior Member |
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I have the K100-5B on the bench. My experience has been primarily tube amps.
This amp powers up. It produces a loud swoosh sound. Not a hum as much as a dull roar. It is consistant and not effected by rotating any controls of the four channels.
I get output from all channels although channels 2 and 3 have a little less gain.
Reverb works.I have installed a grounded power cord. Measured +-38
vdc off the large caps and +-8vdc on the four preamp pcb wires. It appears to have original RCA transistors.
The sound is less like a hum than a rushing swoosh noise. My hopes are that one of you more experienced Kustom gurus can steer me to a logical area to test.
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Re: Kustom K100-5B [message #29160 is a reply to message #29155] |
Mon, 06 November 2023 16:53 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
stevem
Messages: 4759 Registered: June 2004 Location: NY
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Senior Member |
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The 36882s on the 900 board are for the negative and positive voltage regulation to the 803 and 105 boards and will not be a source of your issue.
The other two 36892s on the floor of the chassis are the output transistors.
These are not the likely cause of your noise, just as unlikely as having hissing 6L6GC tubes in a Fender.
That blue wire that you unhooked goes to a resistor and then to a mixer transistor like what V4 does in a Fender with reverb.
I think that this transistor is the source of your noise
[Updated on: Mon, 06 November 2023 16:56] Report message to a moderator
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