Arp 2600 Tuning Issue

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Rumzie
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Arp 2600 Tuning Issue

Post by Rumzie » Tue Jul 19, 2016 5:34 pm

We've got an 2600 at the school that has gradually gone out of tune, by this I mean all three oscillators.

I've tried triggering the CV with the native keyboard and a beatstep pro with identical results. Each oscillatoris slightly out of tune to each other, and they all seem to go about 30 cents per octave jump.

Seems like a scaling issue to me. I've read before that each oscillator has identical scaling components. Not sure how to go about fixing a problem like this so any help is appreciated.
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synthchaser
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Re: Arp 2600 Tuning Issue

Post by synthchaser » Wed Jul 20, 2016 4:05 am

Confirm power supply adjusted correctly then adjust the volts per octave trimmers (R60, R78, R97)?
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synthchaser
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Re: Arp 2600 Tuning Issue

Post by synthchaser » Wed Jul 20, 2016 4:08 am

Here's the location of the trimmers:

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