Antique Sound Lab Hurricane Problem

I just picked up a used pair of these and was as happy as a clam, because these sound really fabulous.

Until the amp blew a tube (V3) and that socket is now dead. Has anyone experienced this very upsetting behavior from this amp ? Is this a common problem and does it have an easy fix ? Or is the amp just really temperamental and needs lots of tips to the factory ?

The filament lights up, but there is no blue halo and the tube doesn't get hot. Meter reads "1" for that socket irrespective of what tube I use there.

Any help would be greatly appreciated. I love these amps but can't afford to own an amp that is not reliable.