[Winky Dink]

1. Regarding the HV supply to the 6SL7, the circuitry is correct and all components are the right values. I followed the voltage from the tube back through the resistor chain until I reached 500V at R73. The voltage readings were still fluctuating.

2. Regarding "instantaneous value of ac vertical sweep voltage" (not sure what or how that happens): I have no analog meter. But wait--I do have a 15 volt panel meter! I set the needle at 1 volt so I could see negative deflection, checked the grids and cathodes, then reversed the leads and repeated the readings. The readings were perfectly steady: G1 1.5V, G2 zero, K1 zero, K2 4.5V. So, does that mean the vertical sweep voltage is the cause of this issue, and I can ignore the irregularity of the voltages?