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In Reply to: RE: That's not it posted by Triode_Kingdom on September 26, 2016 at 21:35:31
TK, no they are not. They are tied to PSU past the 10K-ohm dropping resistor. So, the voltage on the screen's voltage is below the anode plates.They tied into the (+) side of the caps (like pi-filter). The caps are grounded on the (-) of each cap. The rail is B+. Not ground.
20-450 = 20/450, in this case. Not (-) ground point.
Edits: 09/26/16Follow Ups:
Tweed era. Voltage drop applied past one 10k-ohm dropping resistor onto screens.
Blackface era. Voltage drop applied via 470-ohm resistor to each 6V6GT screen. A screen resistor for each 6V6GT. Past the choke.
The first schematic (the one you originally linked) does not employ screen resistors. The 10K you highlighted is a B+ dropping resistor, not a screen resistor. The 470 Ohm resistors in the second schematic are non-decoupled and serve as screen resistors.
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