[time-nuts] 5065A - Looking for AC XFMR PAECO 9100-2742 specification

paul swed paulswedb at gmail.com
Thu Jul 27 14:02:01 EDT 2017

Perhaps you are reading peak VAC that is 1.414 X the RMS voltage typically
called out in manuals. I would email you directly but don't seem to have
your email. Everything points back to time-nuts.

On Thu, Jul 27, 2017 at 1:24 PM, Ulf Kylenfall via time-nuts <
time-nuts at febo.com> wrote:

>  Trying to repair an old 5065A.
> After a lot of problems with the Rubidium cavity restoration, it was time
> to startthe unit.
> Lucklily, I did not have the Rubidium temperature controller PCB
> mounted,but the Power supply regulator malfunctioned and blew the AC mains
> fuse (0.5A).
> Removing that board I discovered that the "24-32V" raw DC was some 40
> Volts.
> Yes - The unit was correctly configured for 230VAC. Even withsome load,
> the DC was still ~40V
> Unable to find out why, I had to remove the original transformer and
> replace itwith a 22V unit after which the rectified DC was back to some 32
> Volts.
> (In Europe, there are seldom primarys with two windings 115/230 which
> madethe search extra tedious).
> The 5065 was originally wired with internal battery backup as well asa
> mechanical clock. These options was removed since the batterieswere
> deceased and the clock driver flip-flop unobtanium.
> After PSU board repair, all supply voltages are normal, the Rubidiumcavity
> warms up and the crystal oscillator and syntesizer seems to work.
> Have not gotten further, just want to know what the h**k was going onwith
> the transformer...
> Ulf - SM6GXV
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