Guys,
The "super AA" is actually my design and was intended to be a turn in your AA and have it modified but Dean ran with the design and built them as a product. It was later renamed the "ALK Jr". It's actually a simplified version of my Universal. Anyhow, the Zener diodes in the AA do absolutely nothing until the AC voltage to the tweeter exceed a certain level, then they clip the tar out of the signal and generate distortion. They were added by PWK to keep from having to replace tweeters under warranty. Unless you have the old round-magnet K77 tweeter, you just don't need them. If you do have the old K77, I would leave them in there. They actually do no harm so long as you keep the volume level to a reasonable level. I personally think they were really an attempt to save the tweeter from reel-to-reel recorder monkey-chatter created on fast forward or rewind. That makes a lot of high frequency sounds at a high level that could be what was blowing tweeters back then.
Al K.