David,
I have a 7934 which is in good health apart from some damage to the storage meshes at the front of the CRT, works fine in non-storage mode. I have been hoping for some time to find a good CRT from a 7834 or 7934 as a replacement. I would be delighted to come and collect. You can contact me at r.g.evans@... to minimise clutter on the list.
Many thanks,
Roger Evans