[ARC5] OT: Hally Instability.

[J Mcvey]

I'll jump on the halli instability bandwagon as well. You could tune many of them  by Just touching or picking up a corner! 
I had a SX-100 in the shop not too long ago which is supposed to be a high end communication receiver, but it too was mechanically unstable.It had some nice concepts, but poor "execution".
 


     On Saturday, November 14, 2015 10:32 AM, David Stinson <arc5 at ix.netcom.com> wrote:
   

 I'm not doubting anyone who says their Hallys were stable.
I do know in 40+ years of hamming, I've handled dozens
of them and never seen a single one from the "ham" 
market line that didn't show mechanical instablilty 
and "wibble-wobbles" above about 12 MC.
Is it possible this was some sort of aging-related
design flaw that a few were spared?
Has anyone ever done a through investigation
to find the root of it?  Coils mounted on a long
bandswitch that will transmit shocks like a 
tuning fork always seemed a candidate to me.
Most likely there are multiple causes.

73 D.S.

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