Is the bracket you show permanently attached to the '69 U79 amp? Is there a date code and/or unit serial number on this amp or amp transistor?
After looking at my “L” shape bracket, did you mean that the bracket looks correct for a '68 amp?
I wonder if there was a change early in the '69 model year from the "L" shape bracket to the cradle style bracket, and if it can be determined from the date code of the amp, or date code of the transistor to date the amp, when the bracket change took place?.
I was also wondering if the radio and amp serial numbers relate to the unit’s date code in any loose sort of way.
I now live in Indianapolis, but I was born and raised in Kokomo, IN, about a 45 minute drive north of Indy. As you can see on the labels attached to the radio and amp units we are discussing, Kokomo is where the Delco Electronics plants are located that once designed and manufactured nearly all GM radios and speakers until the early to mid 1980s.
Since the “arranged marriage” between Delco and Delphi, GM spun-off of Delphi, and then more recently bought back what was left of Delco Electronics. Today, Delco E is primarily a R&D and design center for automotive electronics, and still operates a clean room physicality manufacturing IC chips. I have family who retired from Delco and have friends still employed there. It might be a fat chance, but I’ll try and track down some people who can “shed some light” on the blue light vs. amber light, and other radio related details.
The old Delco Remy plants are located about 35 minutes northeast of Indy in Anderson, IN, that manufactured starters, alternators, voltage regulators, horn relays, etc., I am also trying to track down some information on the CZ vs. CZ1 vs. CZ4 stamped 1100837 alternators used on the ’69 Z28 and several other HP GM vehicles. If I am successful, I’ll keep our Camaro friends on CRG posted!