Yeah EEI is long gone. I used to have one of those Midlands...they were great little CBs
This is probably what they did to the radio (from Defpom's site)
To disable the power limiter remove Q33.
NPC mod: Connect a 1N4001 diode/100ohm resistor in series.
The diode cathode(banded end) goes to the collector (center leg) of Q75.
The other end goes to the junction of R228 & R243.
Modulation limiter can be defeated by the removal of chip resistor R148.
Optional: Use VR10 to set the driver bias to 50ma.
Check that the final bias is at least 100ma.
The other thing they might have done is adjust the AM carrier for use with the amp. Here's link on the various adjustments:
CB World Informer December 1996 Issue, Midland 79-290 Review.
I don't think you would have trouble setting it up or find someone here that can help you with a new radio if that's what you want to do. Search this site for theat 79-290 and you'll find some more info about it.
