Bonjour cher Monsieur bienvenu a liste Tekscopes.
When working on CRTs, BEWARE of implosion hazard, wear gloves, face shield, eye protection as they my implode at any time.
These CRT are available but shipping is an issue as easy to damage unless packed in original TEK CRT box.
Try Qservice in Greece, who may have it.
Also ask Menachem at Condor Audio in Israel.
Finally we think its easier to just find another scope eg at a Ham Radio marche au puces, as replacement of CRT may need complete recalibration.
Bon chance, amicalement,
Jon