I can't quite remember who gave me this idea...  but I'm pretty sure he was a 
member of this mailing list.
I have an HP5071A high performance version with a dead tube.  But rest of the 
unit, as far as I know, works just fine.  I know it has a PPS INPUT on it.  I 
also know it has a very good OCXO in that, too.  Would it be possible to steer 
this OCXO using GPS when Cs tube is completely dead and unlocked?  I do not 
want to take this apart, just in case nice usable tube lands in my hand in 
future.
The reason I ask...  I can just do it and see, but I have no way to verify the 
performance.  I have an old Cs with no characterization, and rest are Rbs and 
T-bolts.  Seems like what I propose would result in OCXO pulled by two 
different servos.  (and even if the results were awful, I wouldn't know it)

Happy holidays!

--------------------------------------- 
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
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