I don't own an AH. I don't know what tone spectrum, if any, you are seeking. That said, of new production (cheap!) tubes, JJ 6922's are very good, but a bit on the warm side of neutral. On the cold side of neutral, and not quite as cheap you can get NOS 6h23's. You might also ask on the AudioAsylum Tube forum, there are some fairly knowlegable tube folks there who may help.
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