[Ron Ramirez]

I generally try to keep mine as original as possible also, but in recent years I have taken liberties with the tone control at times. Especially with two very rusty chassis I had that some would consider too far gone to salvage - a Model 71 and a Model 89. Both now have potentiometers instead of switches for tone controls, and both have 6A7 1st detectors instead of 36 tubes.

http://www.philcoradio.com/notebook/super71.htm
http://www.philcoradio.com/notebook/super89.htm