P K
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I have been tube rolling all of the 12au7 tubes from my tube stash.
Note: I am still using the two Sovtek 12ax7's (from Decware) in the ZP3.
The winner is a Mystery Tube (12au7A), it looks like a NOS RFT (East Germany). Great detail and great bass (it is also smooth).
It is marked in bright RED 12AX7A/ECC82.
The next line is hard to read (see photo).
Made in E Germany?
The tubes are Grey Plate, Short Plate (or square), Smooth Plate.
Halo or circle getter with one support (from a large post, see photo)
A clear round circle on the glass bottom.
Inside the round circle is a V and a mirror image of "12" (under the V).
My second choice, but not close second, is the RCA Command 5814a
Peter
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