Re: [time-nuts] Restoration of 5065A - continued...

[Bob kb8tq]

Hi

Well if people are looking for those willing to “adopt” a stray 5065A or two, 
I’ll certainly toss my name onto 
that list !! :) 

Back in the era HP did these designs, things like surface mount were still a 
bit new. They had some
very legitimate questions about packaging and published a few papers outlining 
them. On something 
like a frequency standard, they likely were even more conservative than on 
something like an entry 
level DVM. 

Without looking at the schematic for a while it’s a bit hard to guess what all 
might be done. On other projects
people seem to have looked at multiple boards as targets for rework. Certainly 
things like per card zener 
regulators are a target. There are a *lot* of three terminal regulators out 
there …..

Bob

> On Sep 11, 2017, at 2:22 PM, Ulf Kylenfall via time-nuts  
> wrote:
> 
> 
> When I mentioned redesign, it was the intention to copy the by HP updated 
> designinto a new Cad project (I use Cadence PCB Editor for which I have a 
> license)and then accomodate for more modern versions of the 
> operationalamplifiers since I guess that there are not that many "A7" 
> modulesaround as surplus. Even HP used DIP-versions in the updated design.
> Today, I was offered a partially scrapped 5065A for parts.The XO is gone but 
> the Rubidium tube is there, (most likely brokenTX heater). I have no idea of 
> how old this unit is, but perhaps some modules in itare more modern than the 
> ones in mine.
> I would have loved to get my hands on a modern/late unit and do the 
> Edmund-Opticsfilter installation (Super 5065A) as referenced here. Some 
> yearsago there were one up for sale at a reasonable fixed price. I 
> hesitatedand -  "kazing" - it was gone.
> I have so far replaced the 709's with 741's and removed the 
> frequencycompensation components (I did that already yesterday). 
> 
> BR
> Ulf Kylenfall  SM6GXV
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Re: [time-nuts] Restoration of 5065A - continued...

[paul swed]

So curious did that get the unit running??
Regards
Paul
WB8TSL

On Mon, Sep 11, 2017 at 2:22 PM, Ulf Kylenfall via time-nuts <
time-nuts@febo.com> wrote:

>
> When I mentioned redesign, it was the intention to copy the by HP updated
> designinto a new Cad project (I use Cadence PCB Editor for which I have a
> license)and then accomodate for more modern versions of the
> operationalamplifiers since I guess that there are not that many "A7"
> modulesaround as surplus. Even HP used DIP-versions in the updated design.
> Today, I was offered a partially scrapped 5065A for parts.The XO is gone
> but the Rubidium tube is there, (most likely brokenTX heater). I have no
> idea of how old this unit is, but perhaps some modules in itare more modern
> than the ones in mine.
> I would have loved to get my hands on a modern/late unit and do the
> Edmund-Opticsfilter installation (Super 5065A) as referenced here. Some
> yearsago there were one up for sale at a reasonable fixed price. I
> hesitatedand -  "kazing" - it was gone.
> I have so far replaced the 709's with 741's and removed the
> frequencycompensation components (I did that already yesterday).
>
> BR
> Ulf Kylenfall  SM6GXV
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
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[time-nuts] Restoration of 5065A - continued...

[Ulf Kylenfall via time-nuts]

 
When I mentioned redesign, it was the intention to copy the by HP updated 
designinto a new Cad project (I use Cadence PCB Editor for which I have a 
license)and then accomodate for more modern versions of the 
operationalamplifiers since I guess that there are not that many "A7" 
modulesaround as surplus. Even HP used DIP-versions in the updated design.
Today, I was offered a partially scrapped 5065A for parts.The XO is gone but 
the Rubidium tube is there, (most likely brokenTX heater). I have no idea of 
how old this unit is, but perhaps some modules in itare more modern than the 
ones in mine.
I would have loved to get my hands on a modern/late unit and do the 
Edmund-Opticsfilter installation (Super 5065A) as referenced here. Some 
yearsago there were one up for sale at a reasonable fixed price. I hesitatedand 
-  "kazing" - it was gone.
I have so far replaced the 709's with 741's and removed the 
frequencycompensation components (I did that already yesterday). 

BR
Ulf Kylenfall  SM6GXV
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