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UPDATE: Ok I read through some articles online (outside of here) about how self-biasing tube circuits work, so R57 which is a 680 Ohm 1W 10% tolerance resistor is the bias resistor, and I measured its resistance and it currently measures at around 753 Ohms which I think is a bit high for that application, would an out of tolerance bias resistor screw up the audio circuit, and give me the funky voltage readings I'm getting?
If so it seems I managed to figure it out on my own, which is what you were wanting me to do.
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