Hi Jeff,
I had a similar issue before and was told that “hitting” it
at the higher frequency might change it back. I applied a “burn in"
procedure for proton at that other frequency and indeed, recovered the original
frequency. I don’t know how reliable this is, but might be worth a try.
Unfortunately, you.d have to get it cold again before doing that.
Markus
On Apr 6, 2026, at 10:35 AM, Jeff Ellena via groups.io wrote:
Hi All,
Our 19 year old Bruker TCI 800S4 H-C/N-D cryoprobe has a tuning problem. The
1H channel can be tuned and matched only between 819 MHz and 821 MHz, BF1 is
800.280. All other channels tune and match normally. I removed to ATM unit
and replaced it with a manual tuning unit and observed the same tuning problem.
I removed the cryoprobe and replaced it with a TXI (room temperature) probe
and 1H tuning and matching were normal. Bruker said the probe is unrepairable
due to lack of parts availability and age.
Does anyone know if there is a NMR probe expert who could repair the probe?
Best,
Jeff
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Received on Mon Apr 06 2026 - 11:15:24 MST