I used to own these amplifiers which were quite good.
However, with only one power supply I think the amps are only 45 watts. You may be clipping them, and VAC amps sound horrible clipped.
No they have around 80 watts in UL and around 30-40 watts in Triode mode (2xKT88 on ech side). They are quite far from clipping since the speakers are relatively efficient. Theres also still a lot of headroom from the amps. They go much much louder than I usually hear.
How would you describe the sound from your audio memory?
Not sure about the PA60, but I recently read over an old Stereophile article on the PA90 in which the reviewer stated that he much preferred the Gold Lion KT-77's that he was using to the stock EL-34's that the PA90 was sold with.
His review was thus predicated on the sound of the PA-90's with the KT-77's.
Of course tube rolling with these amp's is always a good idea as long as you are dealing with matched pairs.
I still think that the PA60 and PA90 are the most beautiful looking amplifiers I have yet seen; understated elegance.
I just wonder how reliable they are?
Enjoy the music!