Or someone tried to "pry" out the HV Anode connector. In a hurry, I did it once to a 23EGP22 set. 13 days of worry while the customer mulled over dad's $61 estimate for repair (filter cap, a rectifier and an HV cup...), I'd have eaten a picture tube. In the end, she bought a set at Sears.
I got to junk the Motorola, and breathed again.
The crack didn't curve - it was straight as an arrow, to the side I had pried from...