Tuning an RMI 368

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boslerk
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Tuning an RMI 368

Post by boslerk » Thu Jul 04, 2013 4:04 pm

Hi! I am new to the world of vintage instruments and would like to learn how to tune my RMI 368, which has several notes out of tune.

I have looked at a very patched together service manual found through a Google search (http://www.cem3374.com/docs/Manuals/Mis ... 68X_SM.pdf), but it was not very helpful. Can anyone shed some light on the process?

Thanks!

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Re: Tuning an RMI 368

Post by rhino » Fri Jul 05, 2013 3:31 pm

Welcome to the board!

Tuning by ear is an art form...takes some practice. Why not just tune the RMI using another synth/keyboard. Just match one note at a time. As said in the manual, if the tuning trimmers will not get the note up/down to pitch, you have electronic problems that will have to be addressed.
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Re: Tuning an RMI 368

Post by madtheory » Fri Jul 05, 2013 5:06 pm

As service manuals go, that one is pretty good! If you know how to tune a guitar and have studied the basics of electronics, it's doable. Worth bearing in mind that there is one oscillator for each note in every octave- it's an octave divider system. Otherwise, take it to a tech. Cool keyboard by the way. :)

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Re: Tuning an RMI 368

Post by boslerk » Fri Jul 05, 2013 7:38 pm

Thanks for the quick replies! Which screws are the tuning oscillators?

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Re: Tuning an RMI 368

Post by sketcherone » Sun Jul 07, 2019 9:35 pm

Resurrecting this old thread. Did you find a way to tune your RMI?

I just inherited one of these keyboards, and the tuning is overall slightly flat. Is there a way to adjust the overall tuning?

I'm also getting a touch of ringing noise in the signal, and wonder if anything can be done to minimize it.

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Re: Tuning an RMI 368

Post by sketcherone » Mon Jul 08, 2019 1:13 pm

I quickly figured out the tuning: it seems that the only way is to tune them individually. It was quick work, when patched into my DAW (ableton) with a tuner plugin engaged. From here one can adjust their beating frequencies to taste.

For the google searchers:
Manual / Service Manual:
https://music-electronics-forum.com/att ... 1392286071

The tuning potentiometers (those wheels standing up):
https://www.dropbox.com/s/30vewd0qhiid3ia/IMG_1497.jpg

Still curious how to minimize the hum on this thing, though!

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Re: Tuning an RMI 368

Post by V301H » Wed Jul 10, 2019 5:10 am

Hum can usually be eliminated by replacing the electrolytic capacitors in the power supply.
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