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Originally Posted by Down Under
The voltage on the grid varies between -42.9V with the control fully counter CW.... When fully CW, the reading is -40.5V,.....
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That's the control grid, G1. The negative voltage you're seeing there is good.
What are you getting on G2, the screen grid? That's pin 4.
It should be some positive value, and vary with the setting of the width control.
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...and nothing on the CRT.
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Um.. the term "screen grid" doesn't refer to the CRT or CRT screen. It refers to the second grid in a tetrode or pentode tube.