Tek 2246, 2246 Mod A and 2246A - differences?

From: Scibuff (bobd426_at_yahoo.com)
Date: 10/23/04 

Date: 23 Oct 2004 11:52:04 -0700

Can someone illuminate me on the differences between the these scopes
and the order they were produced? In particular, I note an "Auto
Setup" button on the 2246A that is missing on the other 2.

Thanks!