I suspect this is not a plated crystal but a plain crystal held between plane electrodes on both sides.? ?It seems to me that migrated solder would cause a permanent shift in frequency rather than one that changed with position.? Opening the holder would tell you.? I think the op said he had opened it. I think the crystal is loose in the holder.? It can't be too tight but also should not move around.? One reason the phasing setting changes could be a change in the holder capacitance due to loosness.
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-------- Original message --------
From: don Root <drootofallevil@...>
Date: 11/7/22 11:29 AM (GMT-08:00)
Subject: Re: [HallicraftersRadios] SX-110 Crystal Instability
steve
I just ran across this,but but there is not enough info to know if it could be related to your investigation.?
?
"This is a BSE SEM image of a quartz crystal that reportedly shifted in frequency. The problem was apparently caused by tin-lead solder on the spring mounts that wicked out onto the silver contact metallization on the crystals, which would be expected to change the mechanical response and therefore the frequency of the crystal."
from ...
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don VA3DRL
