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Re your audio distortion on the bass after warmup - what are the audio output tubes - ECL86's? They are prone to grid emission when they get a bit old. Monitor the voltage across the pentode cathode resistor - if it stays at about 6volts then all is OK but after about ten minutes or so it may start to rise and keep on rising - once it gets to 9 or 10volts turn it off! You're in danger of burning out the cathode resistor, the smoothing resistor and the tube - although the tube is a throwaway!
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Best regards - Marty.
If it ain't glowin', it ain't going'.
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