Quote Originally Posted by bfish View Post
You're welcome Ron.

21533 is certainly the correct number format for a mid-late 70s Altec kit, the '75 reference has numbers all around it. Unfortunately, the next available reference is many years later, after they changed the numbering format.

Would be interesting to know if they had the earlier aluminum coil forms, or the Kapton forms of the 8HII.
I don't know anyway of finding out what the coil forms are made of without tearing them apart which won't happen unless one of them has a failure of some sort.

I'll see what the previous owner knows about the past history of these units if possible.

Regards, Ron