[ARC5] OT: Hally Instability.

[David Stinson]

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.