Sent my repair pix to the group Magnus. On Sat, Sep 24, 2011 at 7:09 AM, Magnus Danielson < [email protected]> wrote:
> Fellow time-nuts, > > I now have three 5065A in my lab (not all mine) and I can now conclude that > the A15 PSU board C8, C9 and C10 caps has gone bad on all three. The only > difference on the first one is that the process has not gone as far as to > blown the caps, but two of the leads has began the process and turned dark > purple on the upper half. Also, one of the caps have been replaced by a 220 > uF cap at some time. > > I already have some fashinating photos of the two other boards lying around > (on Facebook actually...). > > I've already stocked up on replacement caps so replacing them all will be > my first priority. > > Another difference I've noted is that the last one in (Thursday to be > exact, arrived with two cesiums from a fellow time-nut) proved much more > modern. The A15 assembly does not even have the rectifier diodes on it, but > it has been placed off-board. I think this is to provide better cooling and > I seriously consider to modify the other two up to that standard. The > rectifier diodes don't get sufficient cooling as it sits in its compartment, > all sides but the top being closed and then only perforated holes for > self-convection. > > Mounting the rectifiers onto the large aluminium frame would better cool > them over time. > > Another surprice in the later 5065A is the 5061-106 retrofit, where the 105 > oscillator is being replaced with a 10811 oscillator. Will be fun to compare > against the older variants. > > Lack of time for lab duty and lack of space in lab is main obsticle right > now, but it's fun with some progress at least. > > Once I got these three rubidiums of the actual bench, there is a bunch of > cesiums to investigate. > > Need to come up with a suitable measurement rig for all this now. This > morning I was considering the use of either one of my 5,000055 MHz OCXOs or > the 5,000055 MHz out of the TS-105A rubidium (BNC on the back) to set up a > DDMTD system with a bunch of channels. I start to need it for real now... > > Cheers, > Magnus > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
