Ok, that's better, now lets' look into why...
How old is that radio? Any history behind it can help us in knowing what you're dealing with...
Ok, D8 to the Driver and Final - two parts share the same line - now it looks like the Driver may be damaged too. You'll need to verify.
Ok, to help - disconnecting the Final - leaves the Driver still in place, and you're now reading 0.833 in the 2K (or 1K) setting - which means you have an 800 ohm load across the lime somewhere. It may be VR4's(or VR5 per version) influence - so adjust that pot that is circled in the pic below, that has a lead soldered to the line that goes to the LEFT in the photo, this line is from the Mod Transformer on the right side PAST D8.
If it changes your reading then relax, it's the MOD pot placing a load across the line - it's a sense adjustment to adjust MODULATION levels .
I've helped others doing this so you may need to read a thread about Cobra 29 elsewhere I've worked with...It has hints to helps us in this post...
Read this thread...
https://www.worldwidedx.com/threads/cobra-29-ltd-classic-not-transmit.228821/page-4#post-624987
And this one...
https://www.worldwidedx.com/threads/cobra-29-ltd-classic-no-rx-tx-help.253718/page-2#post-716011
And this one...
https://www.worldwidedx.com/threads/cobra-29-ltd.257240/
Now, you'll see a lot of other people on this site also put their 2¢ (cents) in a LOT of effort to help us solve problems with radios - so I CANNOT take ANY credit for others whom are willing to share their knowledge with others that use this forum.
When you thank me - you really should thank the Forum for letting be be here in the first place - they have to put up with me - even on slow news days...
Ok, to put this back on the rails... remember too, that some radios like the 25...are using Mod transformer, and Limiters, and D8's but called D10's for the same reasons - only the package is smaller or changed - to protect the innocent...
Because they are similar, only the part locations and numbers are changed - but they are essentially the same type of process...Audio thru a big cap, into a Transformer tapped with Battery Voltage then passed thru a Diode then onto the Driver and Final...
Ok, since 2078 is not everyone's forte for fun...
Another one to help with that MOSFET mess you're dealing with...
https://www.worldwidedx.com/threads/the-en369fn-mosfet-companion-cbtricks-errors-in-the-drawing-and-the-correction.157713/page-2#post-723522
Ok, onto the Patient...Pass the Rusty Saw please...
[ATTACH=full]42759[/ATTACH]
It's not the best photo but hope this helps get you started.
To help you further, unsolder that VR4 from the board, to remove it from the line. Save it for later to be reinstalled after we fix this mess...
Locate The Driver and Final section - it has a cap right by JP29 - JP29 feeds the Driver from the same line that L15 - feed the Final from. This line is the one I'm concerned about - for if the cap , by JP29 - is bad, replace it - this could be your entire problem...old caps...have been known to place a load on the Audio BIAS (Modulation) line and pop open D8 like a fuse
So if you remove VR4 and the Ohmmeter still shows that 0.833 - then unsolder that Driver Middle leg from the board , and check again.
[ATTACH=full]42761[/ATTACH]
In doing this, you are removing the Transistor from the main feeder that has the strange problem of blowing D8 or the fuses on the radio.
If once these transistors are out of circuit to that line, yet is still shows a short, then you'll have to locate the parts still connected on the line that are causing this. Not many are left connected - so it should be an easy fix
Reconnect that Middle Leg, (called the COLLECTOR) or in a MOSFET (DRAIN) on one, then recheck that ohmic - if it returns - that part is suspect, remove it and replace or reseat it to make sure it's not sorting out to any part of the mounting flange it's mounted to.
Same applies to the FINAL - again recheck the Ohmic results.
I'll stop here, you have a lot of catching up in reading to do...
