I've been eliminating or switching off these lamps for years. The only thing I like glowing in my system is the tubes! Try either wiring-in a small resistor (experiment with value) or disconnecting the lamp altogether. Alternately, you could wire a switch into the circuit but I doubt you'd ever switch it on once you see how nice it is listening without. I think you'll find your soundstage will "grow" in depth and width once you eliminate this distraction.
Good luck!
Good luck!