KUSTOM DE 200 LINE OUT PROBLEM

[SSCBA]

Hello, I am from Argentina and have bought a Kustom Deep End 200 bass head some months ago.
The problem started when I Wanted to record, using the line out from the amp. Both, the 1/4 inch line out, and the xlr output, make a high pitched noise that makes recording impossible. First, I thought it could be the AC supply, I tried with other amps and there was not problem. The high pitched sound is heard either if I use both LINE OUTS (xlr and 1/4), and the effects send/return jacks. This happens always the amp is plugged in to AC, and it doesn't matter if it's turned on or off.

Any ideas?

Thanks

 

[SSCBA]

Today I tried again with the following results:

The line out of the amp was connected to a mixer (with power amp and speakers). Everything was ok. No noise. Then, I connected the OUTPUT from the PC to the mixer and the noise started. The amp wasn't connected to the PC input though. But when I disconnected the the amp from the mixer, the noise shut up. The same happened when disconnected the PC output from the mixer.

I had the same problem with 2 different computers, a PC and a laptop. I'm thinking there is an interference between the amp and the computer. Could this be right? Have any of you had the same problem?




PC OUTPUT -----> MIXER AND SPEAKERS <------ AMP LINE OUT (NOISE)

PC INPUT <------- MIXER <----- AMP LINE OUT (NOISE WHEN RECORDING)

AMP LINE OUT ----- > MIXER AND SPEAKERS (NO NOISE)
PC OUTPUT --------> MIXER AND SPEAKERS (NO NOISE)

 

[billfitzmaurice]

I'm thinking there is an interference between the amp and the computer.

You probably have a ground loop. Cause and fixes shown here:

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