I have a Western Electric brochure for their Model 110A Program Amplifier which features "Automatic graduated compression of excessive program peaks." It is dated 1937. Since this is the "110A" it makes me wonder if it was preceded by a Model 110? I'll look to see if I have anything earlier. Chuck Conrad KZQX Radio _www.kzqx.com_ (http://www.kzqx.com/)