The HV cups were high failure rate on these & the 16"
cousin. Would get pin holes. Also filament windings would
arc. Fire it up with the door opened to see where its arcing.
Disassembly:
First discharge the HV several times. If the tube wont
budge it may be rusted in. Remove the separate plastic
part of the socket ( pull up) then the 2 screws holding in the socket
then the cup. Clean up & fix the arc.
Remember that all the HV & wiring is sitting as apx 22KV so
any rewire needs high breakdown wire.
73 Zeno
LFOD !