I haven’t gotten the time to complete the testing on the Curly Maple yet, but I did receive a couple of tubes for which I’ve been waiting so I can try them in the new amp.
The bias point for the Curly Maple, while chosen specifically for the 6V6, supports operation of the entire 6V6 and 6L6 families of tubes as well as the 6F6. The 6W6 also worked out well in the Marblewood, but my fear is that the Curly Maple may be a little to hot for the 6W6 tubes.
However, it was suggested to me that I try out some 6K6 power tubes. The ones I ordered finally arrived.
The 6K6 is, like the 6F6, not a beam power tube but a true pentode. Now pentodes behave a little differently than beam power tubes in UL typologies. But, after looking at the data sheets, I decided I would give them a try in the curly maple. My only real concern is that the maximum plate dissipation for the 6K6 is only 8 watts. However, if the power dissipations are within specification, I’ll take a few measurements and see how they sound. I may also give them a try in the Marblewood as well.
As always, questions and comments are welcome.