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UK

Ulf Kylenfall

Mon, Sep 11, 2017 6:22 PM

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

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

PS

paul swed

Mon, Sep 11, 2017 6:48 PM

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.

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. >

BK

Bob kb8tq

Mon, Sep 11, 2017 8:12 PM

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 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.

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 <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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Restoration of 5065A - continued...