When switching my DSL-40 from 40watts to 20watts ,the 20watt mode has a loud defining squeal .I don't know what is causing it.
Hello Allen,
We recommend that you take your DSL40 back the to the dealer it was purchased through so an engineer can investigate what is causing the loud squeal, and carry out the neccassary repairs.
Kind Regards
Marshall Support
Hello, I was hoping it might be fixable
See
Hi Allen,
The amp will need to be looked at by the engineer so he can confirm what the issue is and repair the amp, without seeing the amp we can not diagnose what the issue is.
Marshall Support