These are high-quality, tested, NOS tubes. Most are "white-box" RCA's. However, as you can see in the pics, they are actually General Electric construction. This can be discerned by the etched dots and tube designation in the glass, which was unique to GE manufacture. Most are top halo getters, a preferred construction by some Millett tube users.
The 12AE6 presents the highest gain in the MAX or Millett, having a basic tube gain of 14. This gain is typically a few points lower in the actual MAX or Millett circuit, and will be even lower with low impedance headphones. So the value of 14 is given as a comparitive starting point only relative to other Millett tubes.
It's been said that the 12AE6 has the most punch because of that gain and can really drive the bass frequencies, but still with good highs and details. This contrasts well with the 12FK6, which is known for "airiness" and extended highs, but may lack the low end punch of the 12AE6.
Each tube has been personally checked for defects, the glass cleaned, and the pins straightened. They are guaranteed to work in your MAX or Millett, or return them for replacement (shipping not included).