.
been reading this post. I have my China made 148 here that had
a few things done to it before it was given to me.
It works great now. Looks like this same main board
as you are working on. So, I just took the covers off to do
some comparisons.
looks like, by the different soldering, the RF output stage transistors
were replaced. Final TR36 is a 2SC2312 and driver TR38 is a 2SC2166.
the modulator/regulator transistor TR41 has been moved
to the back and is now a TIP3055.
.
.
in AM mode, dead key, I have 3.7 watts RF output.
power supply at 13.8 VDC input and 1.7 A of current.
5.2 VDC going to the collectors of TR36 and TR38
measured at them big blue inductors L39 and L42
at the side to the front panel of the radio.
(not a current hog like them RCI/Galaxy radios with the
IRF520's for the RF output!!) (3.5 to 4 amps!!)
I can key up, whistle, make noise, modulate it
for a long time. no problems. some heat at the
back panel at the TIP3055.
.