Butler:
My amp. was made in 2005 and the largest tube it will accept is the KT120 which I have not tried yet but I plan to. Generally so far the 6L6GC Winged C is my favorite. My Border Patrol 300B is one of best but the 8 WPC is wasting the capability of the Living Voice thus my purchase of the musical 30 WPC.
I purchased the amp. from a gentleman who used 86DB speakers in a large room with KT88's. He said the amp. would clip with high volume Dead Can Dance drive but that was it. He said he wished he had not sold it FYI.
If you use the new amp. with KT150's you would be fine IMO unless you play for the neighborhood. I have heard that the JA80 does not make the music magic of the JA30's simpler design. More tubes in parallel and this happens. The JA30 could be the music sweet spot of the group.
I suspect the new amp. has a reworked transformer tapped for a high voltage set. No idea what they sound like with that tube but the sound could be to die for. These amps. are overbuilt to last longer than us and could be family tokens.
PS: The RED cords are ELROD GOLD STATEMENTS which sound smitten on anything.
Hope this has some type of meaning. Thanks