[time-nuts] HP 10811 stabilizing time

[Neville Michie]

I have found two HP10811s where the EFC did not work.
When I opened them if found a teflon insulated silver plated tubular rivet
with the resistor, varicap diode and the lead from the crystal threaded
through the hole, but they had not been soldered.
A touch of resin cored solder to the point and the EFC came good.
Was this an assembly fault or did they think that the wires did not 
need solder?
Many years after the oxide film that developed proved that 
they did need solder.
So some of the “bad” HP10811s may just need attention.
cheers, 
Neville Michie

> On 22 Jul 2019, at 11:53, Perry Sandeen via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Yo Bubba Dudes!,
> I bought a HP 10811 from ebay for $36 and shipping.
> I installed it in my HP 5335a counter.  After running continuously for about 90 days it was down to about 4 to 6  parts in -10.  I couldn't adjust it for better accuracy as HP in their infinite and inscrutable wisdom provided a edge connector for the 10811 but didn't make provision for EFC one had only the course adjustment.  Sheesh!
> Now maybe I was very lucky in my ebay purchase.  On ebay prices seem to go from $125 to around $60.  One of the lower priced sellers advertise that their 10811's are *tested* but no details.
> Regards,
> Perrier
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