# Theremini calibration/stability and treble issue
**URL:** https://forum.moogmusic.com/t/theremini-calibration-stability-and-treble-issue/23207
**Category:** Theremin Forum
**Created:** [March 30, 2025, 3:09pm UTC](https://forum.moogmusic.com/t/theremini-calibration-stability-and-treble-issue/23207 "2025-03-30T15:09:21Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@gulsahinfrance](https://forum.moogmusic.com/u/gulsahinfrance)
#### Post date: [March 30, 2025, 3:09pm UTC](https://forum.moogmusic.com/t/theremini-calibration-stability-and-treble-issue/23207/1 "2025-03-30T15:09:21Z")
Hi all,
I have a theremini since last year. I did not play it for couple of months and now I am facing calibration/stability and treble issue. After the calibration, in some minutes I am loosing the pitches so it is not stable. On the other hand, on the lower notes, I am facing treble issue. I do not have any object around it with 1.5m minimum distance. Besides, I was always playing it on the same spot and before this never happened. Does anyone have an idea what could cause this? Many thanks in advance.
Gulsah
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### Author:  [@Robse](https://forum.moogmusic.com/u/Robse)
#### Post date: [May 6, 2026, 8:51am UTC](https://forum.moogmusic.com/t/theremini-calibration-stability-and-treble-issue/23207/2 "2026-05-06T08:51:25Z")
I’m having the same problems! Especially the low pitches are very shaky and unstable, the pitch antenna seems to be unable to perceive them exactly