I am getting a constant hum from the speakers on my missile command. It's not the end of the world but it is annoying. Almost sounds like a fluorescent light fixture hum. It's just CONSTANT and a little maddening. It hums during attract and during gameplay.
Things I have done:
- Rebuilt AR
- Checked voltages, they good
- Replaced Big Blue
- Cleaned connectors - edge connector looks very good and is snug. Just a visual inspection but to me it seems aight.
- Replaced ground plug on cord
- Unplugged light fixture, still get hum
- Unplugged monitor, still get hum
- Cleaned volume pot.
Do you think it's possible the big blue I got from Bob Roberts is not good? Or, anything else I should be looking at?
Also, I had another PCB and it was also humming. So, it seems to be in the cabinet and is not PCB related.
Things I have done:
- Rebuilt AR
- Checked voltages, they good
- Replaced Big Blue
- Cleaned connectors - edge connector looks very good and is snug. Just a visual inspection but to me it seems aight.
- Replaced ground plug on cord
- Unplugged light fixture, still get hum
- Unplugged monitor, still get hum
- Cleaned volume pot.
Do you think it's possible the big blue I got from Bob Roberts is not good? Or, anything else I should be looking at?
Also, I had another PCB and it was also humming. So, it seems to be in the cabinet and is not PCB related.

