[time-nuts] HP5065A C-field current is temperature sensitive

timeok at timeok.it timeok at timeok.it
Tue Sep 1 00:55:04 EDT 2015


Hi Chuck,

can you give me more info about th PHK's changes to the oven?

Luciano




On Mon 31/08/15 14:47 , Chuck Harris <cfharris at erols.com> wrote:

> Hi Bob,
> 
> I haven't seen anyone bashing the designer, or the design of the 5065.
> What I have seen a couple of enthusiasts that love the unit enough that
> they are willing to spend countless hours bringing a couple of parts of
> the design up to a more recent state of the art. Corby's modifications
> to the optics added stability that no one anywhere has achieved in a Rb
> standard. PHK's changes to the oven may achieve a similar improvement.
> 
> Between the two of them, the 5065 is looking pretty nice!
> 
> In my experience, there are quite a few pieces of equipment where people
> are willing to take the relatively minor effort to repair them to match
> their original specifications, but very few where people are impressed
> enough with the foundation parts that they are willing to spend the
> great amounts of time it takes to fully understand and modernize the
> design.
> 
> I think that speaks well for the designers of the 5065.
> 
> -Chuck Harris
> 
> Bob Camp wrote:
> > Hi
> >
> > As we go joyously bashing the poor guys that designed this beast, it’s
> worth noting
> > just how old the design is. 741 op amps were indeed “modern” when
> they did much
> > of this and quite possibly to modern to be trusted. Most of the design
> would have been
> > right at home in the late 1960’s at a conservative design house. As
> time has shown, in
> > a lot of cases that mistrust of the early linear stuff was well founded
> ….The 741 only
> > was designed in 1968….The 5065 design dates to roughly that time.
> >
> > Bob
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