More info, from power tubes. Voltage at pin 6: 471. Voltage at pin 4 (after 470 ohm resistor) 359.
Voltage at pin 6 is meaningless, there's no connection (NC) to the tube at that pin.
It's only being used as a tie point for the screen's resistor if you are following the layout.
Plate = pin 3
Screen = pin 4
I just wish I had a cabinet that would handle 40 watts. My only cabinet is a 1 x 12 with a 12" Weber Signature something or other in it. The cheap one. If I go over 25 watts, there will be trouble.
I have a 10" Ragin' Cajun arriving tomorrow, though. Busy day building a new cabinet.