Hi Marshall,
I recently bougth the DSL20CR marshall amp and it makes this noise on ultra gain channel.
https://youtu.be/VbtZsJTpAMs
What can cause this noise, could it be defective? I've tried it in different places in case it could be a power supply interference but the noise is still present.
Thanks in advance.
Regards
Without seeing the amplifier it is hard to diagnose, as it has recently been purchased we would recommend that you take it back to the dealer so it can be checked over for you.
Kind Regards
Marshall Support - Lee Tomlin 12 May 2020 at 08:53 AM