This one had moved on moons ago to live it up in the bars of Nashville. It was just too bulky in odd places and uncomfortable for me. Pickups were nice. Very warm vintage.
Electro-Harmonix 6L6s are my preference as well as 6AC7s of the same make. I had a cool mix of EH 6L6s and JJEL34s in a 100 and it was great. Bias yourself. It isn't that hard with the bias points right on the back of the amp.
Awesome mod for sure. I still miss mine and I haven't heard anything like it since. Something crazy in the mids that set it apart and can only really be understood when one is being played in person.
I had never used my 20s that I had in that manner but I see no reason why it shouldn't work for the exact way you want. All of the outputs should work at the same time.
They have a day at this event for peeps like us. If you get the chance you have to go. All the free stuff and free range to wail on gear is just too good to pass up.