[time-nuts] HP5065A revival project, progress report

paul swed paulswedb at gmail.com
Mon Oct 3 18:18:32 EDT 2011

Magnus that good news. Especially even having 3 X 5065s. I really need to
look at the a15 to see what caps you are talking about. Then check my single
5065 and make sure I am not headed in your direction.

On Mon, Oct 3, 2011 at 5:54 PM, Magnus Danielson <magnus at rubidium.dyndns.org
> wrote:

> Fellow time-nuts,
> I wanted to bring you an update on the HP5065A revival project.
> I have three units, unit A, B and C.
> For unit A I have been able to achieve lock, unit B had a PSU failure and
> so did unit C. The PSU of unit A is about to fail, but I will fix it up.
> I have now done some work on the A15 board of unit B, repaired traces and
> replaced 4 caps. It still provides a heavy load which makes the +20V supply
> "duck" to 8,70V, as it goes into current limiting. Interestingly enough this
> is limited to the PSU board itself. To test this theory I borrowed the A15
> board from the unit A into unit B, and using my experience of trimming up
> unit A I was able to get unit B to lock up and even lit the Continous
> Operation lamp.
> So, now I have both unit A and unit B locking up for me, but I will have to
> work more on the A15 assembly for unit B in order to get them operational at
> the same time. However, it will be much more rewarding to work on that board
> now that I know that it is about the only thing I need to fix, and I've
> already come a bit down the road on that one.
> Unit C also has the A15 board failure, but it failed even more spectacular,
> so I will need to replace the zener diodes as the acid took one of the zener
> diode legs with it... :P
> First degree cleanup has been started.
> I will also need to replace caps on A15 on unit A, as they are about to
> fail. However, running shorter batches should be fine for the moment,
> especially as I cab down and get additional convection.
> Anyway, it is quite rewarding right now. I just couldn't avoid sharing some
> of the progress. Hope it doesn't add too much to the noise here.
> Cheers,
> Magnus
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