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RE: Is there any real benifit sonically between class A, AB etc...

"A 12AX7 has some very nice curves. Granted it is not a power triode but it is indirectly heated. "

Yup, the 6sn7 at 14ma 200vdc plate is just about as linear as anything gets but none of the indirectly power tubes come close to the DHTs.

Well.......maybe the 6a5. It's build just like a 2a3 with a W filament but in the 6a5 it's a heater with a tiny cathode tube around it.

I think that indirectly heated power tube is just as linear as it's 2a3/6a3/6b4g cousins.

So i guess the answer to the question is, it's in the physical layout of the way that they are made.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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