[R-390] HP 8640B Question

[rbethman]

Barry,

There has been a LOT of discussion about these nylon/delrin (?) gear on 
the Test Equipment (qth) list.

Apparently someone is "trying" to get a "good" one so that BETTER ones 
can be made.

You may want to join and search the archives, or just search that lists 
archives.

One site, <http://jvgavila.com/hp8640b.htm>, shows the split gear clearly.

This causes the gear assembly to jump a tooth or two,, no doubt causing 
it to NOT be where it is supposed to be!

Apparently, this is true of similar numbered instruments.

Bob - N0DGN

Barry wrote:
> I think some folks on this list have HP 8640Bs so I thought I might indulge 
> those fellas a second.
>
> I think I understand that there's a rather delicate gear that frequently 
> breaks in these units.  When that occurs, what are the symptoms?  Is this, 
> by any chance, directly related to the frequency change knob?  In other 
> words, if this gear breaks completely, would the frequency change knob work 
> at all?
>
> Also, I seem to recall that someone made some replacement gears.  Was it 
> someone on this list?
>
> Thanks in advance for any info on this,
> Barry - N4BUQ 
>