Joe, Nice find. Don't worry about the lamp, they VERY seldom fail. Of course there are electronics failures that crop up. What color is your physics package? Blue paint= old style Olive green paint = mid production Silver (no paint) = late production Also can I get your units serial number for my list? With it in the operate mode watch the control voltage and slowly adjust the fine quartz back and forth. If it is indeed locking to the Rubidium the meter should follow your adjustment. I would not worry about the physics package case either, just put some tape across to seal it from heat loss. I can give you some alignment hints if you need them. Corby Dawson cdelect@juno.com

<cdelect@...> writes: > > Joe, > > Nice find. > > Don't worry about the lamp, they VERY seldom fail. > > Of course there are electronics failures that crop up. > > What color is your physics package? > > Blue paint= old style > Olive green paint = mid production > Silver (no paint) = late production > > Also can I get your units serial number for my list? > > With it in the operate mode watch the control voltage and slowly adjust > the fine quartz back and forth. > > If it is indeed locking to the Rubidium the meter should follow your > adjustment. > > I would not worry about the physics package case either, just put some > tape across to seal it from heat loss. > > I can give you some alignment hints if you need them. > > Corby Dawson > cdelect@... > > The physics package is silver so you reckon late production. By looking at date codes I reckon it's late 1988 production, does that come into that definition. When did they stop making the unit? Also regarding serial number the tag at the back has been filed so that the number is not legible, however the calibration stickers and a departmental identification tag list it as 916-00184, does that tie in with the rest of the numbers you have? Again from the cal stickers etc this is an ex RAF machine. I switched to control voltage and initially it was off the scale, adjusting the fine control just brought it back to 50, so I tweaked the coarse slightly to take the reading down to 40 and then adjusted the fine as you suggest and the meter follows the direction of adjustment. This also took the output from +25 millihertz to -2 around the 5MHz nominal so it does appear to be locked. The unit does not have any options so just a blank plate on the right and the lock light is red instead of green also the back panel connections are different to any shown in the manuals I've seen, though I have found some of the differences by trawling through the changes section. I'm back to the cal lab next week to pick up a meter that they are calling for me and whilst there I shall see if I can find something of the same vintage that uses the same top and bottom covers and side rails that I can cannibalize to fix this unit. If I can then I'll keep and get it back to pristine condition, if I can't then I'll find someone else who want's to take on the burden. JoeD

I shall see if I can find something of the same

On 2/6/2015 4:16 AM, Joe D'Elia wrote: > I shall see if I can find something of the same > vintage that uses the same top and bottom covers and side rails that I can > cannibalize to fix this unit. Joe, You may find the side panels / handles castings since they are common to a lot of that vintage -hp- gear, however the top cover is more or less completely full of ventilation holes which I have never seen in any other instrument of that series, thus perhaps unique to the 5065A. A lot of drilling if you use one from another unit! If you have the 10811 oven then it is pretty certain that it is one of the last few versions of the 5065A so the 916 prefix doesn't sound right. Mine with the 10811 is 2432A prefix for example. A good find, even if you do have to drill a lot of holes! Dan

Joe a very nice find. The light won't change to lock unless you toggle the little switch inside the cover on the left to reset. Its intended to be that way so that you know you lost lock Regards Paul WB8TSL On Fri, Feb 6, 2015 at 7:16 AM, Joe D'Elia <joe@windrushadv.co.uk> wrote: > <cdelect@...> writes: > > > > Joe, > > > > Nice find. > > > > Don't worry about the lamp, they VERY seldom fail. > > > > Of course there are electronics failures that crop up. > > > > What color is your physics package? > > > > Blue paint= old style > > Olive green paint = mid production > > Silver (no paint) = late production > > > > Also can I get your units serial number for my list? > > > > With it in the operate mode watch the control voltage and slowly adjust > > the fine quartz back and forth. > > > > If it is indeed locking to the Rubidium the meter should follow your > > adjustment. > > > > I would not worry about the physics package case either, just put some > > tape across to seal it from heat loss. > > > > I can give you some alignment hints if you need them. > > > > Corby Dawson > > cdelect@... > > > > > The physics package is silver so you reckon late production. By looking at > date codes I reckon it's late 1988 production, does that come into that > definition. When did they stop making the unit? Also regarding serial > number > the tag at the back has been filed so that the number is not legible, > however the calibration stickers and a departmental identification tag list > it as 916-00184, does that tie in with the rest of the numbers you have? > Again from the cal stickers etc this is an ex RAF machine. > > I switched to control voltage and initially it was off the scale, adjusting > the fine control just brought it back to 50, so I tweaked the coarse > slightly to take the reading down to 40 and then adjusted the fine as you > suggest and the meter follows the direction of adjustment. This also took > the output from +25 millihertz to -2 around the 5MHz nominal so it does > appear to be locked. > > The unit does not have any options so just a blank plate on the right and > the lock light is red instead of green also the back panel connections are > different to any shown in the manuals I've seen, though I have found some > of > the differences by trawling through the changes section. > > I'm back to the cal lab next week to pick up a meter that they are calling > for me and whilst there I shall see if I can find something of the same > vintage that uses the same top and bottom covers and side rails that I can > cannibalize to fix this unit. If I can then I'll keep and get it back to > pristine condition, if I can't then I'll find someone else who want's to > take on the burden. > > JoeD > > > > _______________________________________________ > 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. >