I have a Marshall DSL 50 (that works fine) with an unusual issue - the red channel LED stays partially illuminated when the green channel is selected. It dims appreciably but doesn't totally turn off.
This is true whether the channels are selected via the footswith or the front-panel button. I've traced voltages as far as possible without pulling the front-panel PCB, and everything looks OK except that there is always a little voltage on the base of the MPSA13 associated with that LED - about 18V when it's on, about 0.2V when 'mostly' off.
Do I need to replace the transistor? I had a DSL 100 last week that I'm 99% sure did NOT do this.
This is true whether the channels are selected via the footswith or the front-panel button. I've traced voltages as far as possible without pulling the front-panel PCB, and everything looks OK except that there is always a little voltage on the base of the MPSA13 associated with that LED - about 18V when it's on, about 0.2V when 'mostly' off.
Do I need to replace the transistor? I had a DSL 100 last week that I'm 99% sure did NOT do this.
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