Tube Rolling?

[myrgatroyd]

At your service. Yes, the sound switches... they are the source of fun but also a source of trouble when dirty...
The radios where built "with the ears", but not to amplify a clean linear line. That is their charms. Placed in the edge of a room (I think the engineers had this place in mind) you can alter the bass and the mid-bass + 6db.
Have fun with your really nice Turandot.