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this is a tough one because pretty much any question that someone or some thing could not just look up on google AI would alienate anyone who was new to CB radio.
the yellow wire is most likely gone because someone volted the final.
this used to be a popular mod and it applies the full 13.8 volts to the final in AM mode. It was done because it could squeeze a few more watts out of the radio, but it came with costs, and imo is just not a good mod.
here...
Remove R105 which connects to the base of TR33.
replace it with a 1N4148 diode and a 5K trimmer pot in series.
unbanded end of the diode goes to the base of TR33, and banded end connects to the trimmer pot. other side of trimmer pot goes to ground.
I like to wire the pot like a rheostat which...
MKwrench,
those are all good changes, but there is a better mod for the audio.
try changing the value of R228 to 1.2K and then adding a 1uf non polarized cap from pin 9 of the audio chip to the junction of R194/R228/D36.
Leave the limiter intact and on the versions that have a fixed value...
i'll just add to the already great advice here to say that the temptation to increase the value of the filter caps should be avoided.
yes, you can increase the value of the main filter cap where Vcc enters the radio.
I do this on every radio i do.
however, increasing the value of the filter...
an easy way to do what Brandon is telling you, and it is the correct way, is to put a current meter on the power wire going into the radio.
put the radio in SSB mode with mic gain all the way down.
install the "mirror board" that goes in front of the final and driver.
now key the mic while...
if this is the washington with the MB8719 PLL chip in it then change R204 to a 1.2K ohm resistor, and add a 1uF non-polarized capacitor from pin 9 of the audio chip to the junction of R121, R204, and D62.
make sure to restore any modulation mods to stock before doing this mod.
you do need a...
this board is going to be very similar to the early galaxy radios like the DX33HML.
there will be differences in the PLL section, and the offset crystal used will most likely be a different frequency, but the rest of the radio should be pretty much identical so you can use their alignment...
you should replace both of them, not just one of them.
here is a pair for a pretty good price:
https://www.ebay.com/itm/306397250650?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5336136228&customid=&toolid=10001&mkevt=1
be careful with the installation of the new parts as they may be...
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