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I wonder how many times you will need to replace the vacuum tube.
Why use an old vacuum tube when a modern audio opamp sounds perfect and probably will never need to be replaced?
Oh, you want the even harmonic distortion produced by the vacuum tube?
For an electric geetar?
A while back I wondered how good it would sound to have a tube front end and a monolithic amp power driver, and have the tube clip before the power amp, putting attenuator between the tube and the power amps would probably do a similar thing.
I was thinking something more for guitarists, for music you want low distortion.
Are you running the heater from one of the amp rails?