[Ron Ramirez]

An early Model 70 without AVC will be super-sensitive...because, with no AVC to reduce the gain of the receiver on strong broadcast signals, the receiver is operating at "full throttle" all of the time. On a later Model 70 with AVC, the gain will vary depending on the strength of the received signal due to the AVC action.

I used to have Ed Locker's modified 70 schematic around here somewhere, but with my newer computer currently being dead, I'm not sure if it is stored on it or not.