Mighty Monarch of The Air

[roundscreen]

Originally Posted by bandersen

I have several early rectangular 16" CRTs with no coating on them. I'm not sure why though. The datasheets state that they should.

That is interesting. Do your set's have a door knob cap connected to the hv rectifier tube? In A set with a metal cone crt the door knob cap goes to ground.
Wonder why are they using a door knob cap in a set with a glass crt instead of using the aquadag for a path to ground?
Ed

[bandersen]

Originally Posted by roundscreen

That is interesting. Do your set's have a door knob cap connected to the hv rectifier tube? In A set with a metal cone crt the door knob cap goes to ground.
Wonder why are they using a door knob cap in a set with a glass crt instead of using the aquadag for a path to ground?
Ed

Yes, they have doorknob caps. So do most of my 10BP4 and 12LP4 sets with grounded aquadag. I guess they wanted the extra capacitance. I think only my cheapo Motorolas rely entirely on the aquadag for HV filtering.