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Most DMM have an input resistance of at least 1meg, so using your DMM would not significantly change the voltage reading from what Sams got using a VTVM. There are however notes on the Sams schematic stating the control settings they used when making measurements. That's because some voltages can vary with different control settings.
Your 5AQ5 680 ohm cathode resistor is not out far enough to cause a serious bias issue. But you do need a known good tube in there to move forward. I would think your 6AQ5 would work, if it is in fact a good one.
What perplexes me is how you seem to enjoy back paddling. Last we heard you said the funky negative voltages went away when you temporarily removed C50(.01uf). It was suggested that you remove that cap to correct the negative voltage situation. Have you done so, or replaced it with a know good cap? And if so what was the outcome? Now you're right back to wondering willy-nilly without a clue or sense of direction. I'm trying to provide you a sense of guidance, but like they say you can lead a horse to water, but..
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