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If there are HG transistors in it, they have been changed.

Amplifier I assume? If you have any amplification out of the amp, the transistors are working. There is something else going on inside, and I'd suspect that It most likely happened when the transistors were changed.

Looks like the purple wires are to turn on the SSB delay without activating the power stage reduction.

I have seen a couple 23 channel Mocats. Here is one: https://www.ebay.com/itm/234599538556?mkcid=1&mkrid=711-53200-19255-0&siteid=0&customid=link&campid=5336136228&toolid=20001&mkevt=1

I haven't seen anything that tells me that.

You can always remove VR10 and run wires to an externally mounted 5K potentiometer.

Well VR6 (the mangled potentiometer) is for the antenna warning light. I have no clue what is going on there.

I always strive to get it as low as I can, but if you reach an impasse and it bottoms out, you can always get a good antenna tuner to keep the amp happy. Those numbers are pretty good and won't hurt anything, but a tuner can get you a near perfect match and keep the box happy, run cooler, and...

http://www.cbtricks.com/

If you want to play multiple albums at a time, finding one of these is good, or at least repairable shape for a good price is the way to go. https://www.ebay.com/b/Dual-1219-Turntable/48649/bn_55188817 I grew up with one and remember it always sounding top notch.

All of the Uniden radios were manufactured in the Philippines. They didn't go country hopping like Cobra did.

THIEF!!!!!!

I sold a MKII along with the external VFO and a service manual for $750 in 2008.

You stole that Yeasu.

12 bands and no FM. Derp.

I would think there is also the possibility that the speaker is just blown. These radios are getting on 30 years old and used paper cone speakers.

The proximity to the building is not helping. You are getting stray RF all over the place, and if you are sitting on the porch as well ,you are effecting the match. You would probably be better off trying to run a dipole along to top of the porch horizontally and see how that works for you...

This might help with what Ranch55 is saying. I highlighted the output transformer, the bias resistors, and the collectors of the transistors for you.

Yes, through hole.

Which diodes are you talking about?