A15Mk1 Ch.2 volume knobs noise ?

Modulation

Hi!

I have just build A15mk1, all works fine but channel 2 volume knob keeps some "scratching" noise when im turning it. All other knobs are quiet.
Is it normal or do I have some wire wrong connected or bad solder ?

MAD

Re: A15Mk1 Ch.2 volume knobs noise ?

Hi,
please measure the Voltage at the volume pot, there should be no DC Voltage at the pot. If there is DC, please check C18, C19, C20, C21 if they are all in place correctly.
Regards, Martin

Modulation

Re: A15Mk1 Ch.2 volume knobs noise ?

Yep I found DC in channel2 volume pot (from middle pin). It increases when I turn it more. C18, 19, 20 and 21 are in correct place, but C21 is "injured". It has melted from side, so I have to replace it and check it again.

Modulation

Re: A15Mk1 Ch.2 volume knobs noise ?

Now it works fine. Channel2 volume pot is allso quiet now when im turning it.
C21 was broken, total shortcut.
Thanks for information.

MAD

Re: A15Mk1 Ch.2 volume knobs noise ?

Great to hear that, have fun !
Regards, Martin

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