Rick Casey wrote:

I am not an electronics guy, but need to ask for some
opinions from people who are...and hopefully help me find
the right solution to fix my amp.

I have a Roland Cube, which I basically use as an amplifier
to play music through, or my guitar.


** The first Roland cube was the "Cube 40" released in 1978, then followed Cubes 20 and 60 and then too many new models to count. Roland claim to have sold over 1,000,000 Cubes of all the various sorts.

Which one have you got?



Pulling the plug immediately, when I later tried to play music through the amp again at proper volume, nothing comes out but a steady hum.

** Was that the power plug ?


So my question is: what damage did I likely do?
Can it be fixed? Is there any other testing I can
do to determine what was damaged?


** Answer the first question and maybe we can make an educated guess.

One possibility is the input jack ( or the PCB it is mounted on) has broken.

All depends on which model Cube you have.


.... Phil