remove c207 change R206 to 35-39K remove c232 Q41(AM regulator) probably 2sc1419, change it to a NTE152 C18, change to 680uf 16volt or bigger change C172 to 3300uf 50volt change C163 to 3pf change R114 to 10k for wider audio response(you can experiment to see how much lower you can go) i use 10K. put R131 on a SPST switch. take a 10uf 25volt electrolytic cap & solder across spst switch, find C23 & run leads from + & - to same polarities of cap soldered to switch, fast & slow AGC for SSB. replace Q14 with a 2SC2999(that's the best choice, but i think NTE107 works also)for at least 3 db gain on weakly received signals! take the Q14 you removed & use it in place of Q19(2SC945). that will be a major upgrade to SSB detector. for even more increased AM sensitivity(& less noise) replace D1, D2, D21, & D22 with NTE583 schottky diodes, or SK9975 diodes. remove R95 to broadband VCO. these mods will not stress out your radio; they will make it better. R131 is a modulation limiter for the AM mode. its up to you if you want to remove it, put it on a switch (my choice), or leave it alone. its all about personal preferrence. have fun with these, matt i replace all the electrolytic caps in my radios as they are getting old. big difference in audio quality on both RX and TX with the new caps.