I pulled my MG-1 out of the basement and tried it after about 10 years, and I’m getting very annoying clicks when the output switches on and off (i.e. a key is pressed or the contour switches on). I’m looking for advice if this is normal, or if there is a problem.
One way to repeat the problem is to set all sliders to the bottom, set Auto Contour Trigger to IN, Modulation Rate to fast, Contour Tone Sources to Keyed. I get a loud clicking or buzzing sound (depending on the Modulation Rate). With Auto Contour Trigger set to OUT, this happens every time I press a key.
I would be grateful if someone could tell me if this is the normal behavior, or if something is wrong.
I opened up the MG1 and adjusted the VCA balance adjustment according to the service manual, since that seems to be the most likely source of DC pulses (which is what this sounds like) when the contour switches on and off, but that didn’t make a difference. Now I’m thinking maybe the contour generator is generating “too sharp” contours. However, I’d hate to spend a lot of time tracking this down only to discover that I forgot to set some switch and there’s no real problem. (As I said, it’s been 10 years, so I may be forgetting something obvious.)
Thank you,
Ken
