My newest project, Philco 50T-1402 year 1951

[old_coot88]

Originally Posted by jr_tech

Another vendor on Amazon has it right:
http://www.amazon.com/Oudin-Coil-Tes...rds=tesla+coil

"Cleaning" as in spot knocking?
jr

Not sure what is meant by spot knocking. But rebuilt CRTs would frequently arc after installation due to less-than-perfect cleanliness by the rebuilder.
The "cattle prod" applied to the pins would cause debri particles inside the tube to incandesce white and fly around, eventually welding themselves in place somewhere, out of harm's way.