Feedback from customer Gregg O. by email:

“The 6CA7Z’s arrived safe and sound.
I have about 5 hours on them and so far I think something special is going
on.
I have on hand a quad of NOS EL34’s from a very reputable source that have
150 hours on them..and so far the 6CA7 Treasures seem to have more fullness
and body to the sound without sacrificing detail.
I can safely say that if one wants to prevent stomach ulcers and headaches(
from banging your head against the wall) trying various NOS EL34’s…Just
buy the 80% emission Treasures and be done with it.