Datum / Symmetricom ExacTime 6500 upgrade from TCXO to OCXO

[jfphp]

Hello,
I have got a Datum / Symmetricom ExacTime 6500 fitted with a TCXO and I would like to upgrade it with an OCXO. Board has the place  with holes to solder it, there are instructions for jumpers but what is the part number of the OCXO ? There are a lot of Datum/ Symetricom OCXO on EBay but what is the right part ? I haven't found in the various manuals on the net. Thank you.

[EOC_Jason]

It's been many years since I had an Exactime (and I really don't remember what the inside looked like or the menus), but if their design is in any way similar to the Tymserve then the normal OCXO used is a MTI 240-0530-D. There has been a few posts & links to a couple people doing TCXO to OCXO conversions with tymerves on the time-nuts list, you might want to sift through the mailing list archives as that would probably yield the best info. I'm attaching some pics from a couple different tymserves (one OCXO, one TCXO).