Well, I had 89dB 6 Ohm speakers that were also a very benign load to the amp & I selected the AES Sixpac after doing a fair bit of research.
I selected these amps because I liked the fact that the feedback could be made 0 & that the EL34 tubes were being used in triode mode. I felt that using the EL34 in triode was the best option because of it being far more linear than using it in U-L or pentode mode. My Sixpac had the upgraded transformer hence outputted 60W/ch. I used a NOS GE 12BZ7 in the input stage to excellent effect - it took a very good sounding amp up a few notches & made it a great sounding amp. Plus, the GE 12BZ7s were relatively cheap so it was a win-win situation for me.
IMHO EL34 in triode mode gets my vote any day over any other mode of operation.
I selected these amps because I liked the fact that the feedback could be made 0 & that the EL34 tubes were being used in triode mode. I felt that using the EL34 in triode was the best option because of it being far more linear than using it in U-L or pentode mode. My Sixpac had the upgraded transformer hence outputted 60W/ch. I used a NOS GE 12BZ7 in the input stage to excellent effect - it took a very good sounding amp up a few notches & made it a great sounding amp. Plus, the GE 12BZ7s were relatively cheap so it was a win-win situation for me.
IMHO EL34 in triode mode gets my vote any day over any other mode of operation.