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Originally Posted by Kevin Kuehn
...Can anybody explain to me why they reference the bottom of that doorknob to the plate of the damper?
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Seems like the only advantage is that the voltage across the doorknob is a bit lower (by the B+ value). But it shouldn't make any difference in the grand scheme of things.
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I know some of the older sets had it going to ground, so it was in parallel with the dag coating.
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In the old sets with metal bell CRTs, there was no dag system to filter the HV, so doorknobs served that purpose.
But when all-glass CRTs with inner & outer dag came along, doorknobs weren't strictly needed but were sorta "grandfathered" along by convention for a while. Seems like, anyhow.
In the set being worked on here, the doorknob serves mostly as mechanical mount for the 1B3.