# Etherwave pitch calibration drift

**URL:** https://forum.moogmusic.com/t/etherwave-pitch-calibration-drift/18436
**Category:** Theremin Forum
**Created:** [October 19, 2016, 8:40pm UTC](https://forum.moogmusic.com/t/etherwave-pitch-calibration-drift/18436 "2016-10-19T20:40:50Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![jimbourekas](https://forum.moogmusic.com/letter_avatar_proxy/v4/letter/j/67e7ee/32.png) [@jimbourekas](https://forum.moogmusic.com/u/jimbourekas)
#### Post date: [October 19, 2016, 8:40pm UTC](https://forum.moogmusic.com/t/etherwave-pitch-calibration-drift/18436/1 "2016-10-19T20:40:50Z")

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Hello,

Every time I tune my theremin and play, after a while (about 10 minutes) the tuning has drifted, expanding the field. To fix, I have to slightly rotate (maybe just move half a mm) the pitch knob to compress the space again.

Any ideas?

Regards,

Jim

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### Author: ![jocala](https://forum.moogmusic.com/letter_avatar_proxy/v4/letter/j/e274bd/32.png) [@jocala](https://forum.moogmusic.com/u/jocala)
#### Post date: [October 20, 2016, 8:36pm UTC](https://forum.moogmusic.com/t/etherwave-pitch-calibration-drift/18436/2 "2016-10-20T20:36:42Z")

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Has the theremin warmed up? I give mine 20-30 minutes after I turn it on.

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### Author: ![jimbourekas](https://forum.moogmusic.com/letter_avatar_proxy/v4/letter/j/67e7ee/32.png) [@jimbourekas](https://forum.moogmusic.com/u/jimbourekas)
#### Post date: [June 9, 2017, 1:38pm UTC](https://forum.moogmusic.com/t/etherwave-pitch-calibration-drift/18436/3 "2017-06-09T13:38:54Z")

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Sorry for getting back so late, I haven’t been visiting the forum for months!

I will try letting it “sit” for half an hour before testing again. I will report back.

Thank you

Jim