I listened to your Youtube video, thanks for sharing that. Also, great to hear that you've already checked the components that are particular to the SSB/CW demodulation. What I think I hear in your video is that the SSB signals are not being correctly placed in the filter passband. I would check the frequency of the BFO if you can. Any offset in the BFO frequency can be heard directly in the audio. I also hear the noise Gary is hearing and agree with his power supply comments. I would also suspect the BFO power supply, tube, or biasing components.
Given that the radio is otherwise working, I'd swap the tube out first. The manual I downloaded also has a voltage and resistance chart starting on page 4-2. I would do a quick check against that. One nice thing about tubes is that they are high impedance powered down, so the resistance values are based solely on the passive components. But, this is also an old radio, so we also need to worry about aged components.
Keep us up to date on your progress!
73's Jim N8CAH
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