[time-nuts] HP5065A Step Recovery Diode, what part#?

paul swed paulswedb at gmail.com
Mon Aug 27 22:08:47 UTC 2018


Corby would have the best answer. But this has come up before and I am
pretty sure they were HP specials.
Great that you have 2 X 5065s, wow.
I don't want to mislead you, but are the drive and the anttenuator set
correctly?
Regards
Paul
WB8TSL

On Mon, Aug 27, 2018 at 1:39 PM, Chicken Time <chickenclocks at outlook.com>
wrote:

> Greetings,
> Long, long time reader/fan, first time writer.   I have a HP5065A that
> I've been messing with that has a problem which I think I've narrowed down
> to the SRD.  It is functional but seems to have an unusual behaviour,
> including visible amplitude variability and flickering of of the 2nd
> harmonic.
>
> I've replaced everything with guts of a 2nd unit but nada.  The last step
> in my testing was to replace the SRD, but the only ones I could get from
> easy sources were SMT ones. However, I was able to hack one in!  This did
> work and the 2nd harmonic was stable!   BUT of poorer quality Allen Dev
> with an original Axial HP step diode, of which I am not entirely surprised.
>
> The HP SRD has the text H391, 391, and P391 written on it.    Nothing in
> the Manual or Google searches gives me any indication of what it is,
> including combination such as taking the number as a resistor (390).  None
> of HP's original list of SRDs is even close either.
>
> Does anyone here know what IS this SRD?
> Thanks much,
> Dan
>
> -Chickens are more obsessed with time than Humans. Proof: Clock Clock clock
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