Wayne,My Paramours are virtually hum-free- why I was wondering. I have the C4S, but haven't added any of the "hum reduction" mods. Am using a Tektronix/Telefunken 12AT7 for the driver, and an old RCA 2A3, though.
Am interested in hearing your rundown on the Paramours driving Stage and other higher option Pi 4's- as I'm corner-challenged. Starting to think about some sawing & gluing....
Matts