My 980SSB came with a 6-to-4 pin adapter that does work for an HG M75. That being said, I would not recommend the HG M75
anymore. Based on reading reviews, some of which go back a decade, it
had been a good powered mic for people.
The one I bought a month ago on Amazon is different, and is garbage.
I opened it up to try the resistor mod, only to find that they have (apparently recently) changed to a
surface-mount design and the labels on the board no longer match up with old PDF docs you can find online describing the resistor and capacitor mods that are supposed to wake this mic up. Me being an un-educated electronics hack, I was unable to decipher the changes they made to the board to figure out which resistors one would mod if you even still wanted to. I took some guesses and made some attempts, but it only resulted in making the audio quieter and weaker, so I backed out my modifications and put it back together as stock.
Unable to complete the mods people have done in the past to the previous version of this mic, I am very disappointed in its sound and volume in its (updated) stock form. The audio quality is bad and at full power its still not as loud as the stock mic that came with my 980 SSB. It might be marginally louder than the stock mic on my cheaper radios like my 505XL but the quality of the audio is bad enough to make me not want to use it. Its now sitting in a drawer and could be there for a while. This summer I can see if its really any better than the stock mic of the 505XL in my old beater car but right now its -20F and I don't want it to not work because the 9v battery inside it gets too cold. It's definitely no upgrade vs the stock mic on the 980SSB so it would be a shocker if its better than the stock mic on a President Electronics product.
Now, its only $15 so not out much to give it a try. Just letting you know it didn't/hasn't worked out for me and it seems to have something to do with them having updated the internals recently and continued selling it under the same name, but the glowing reviews of people who bought it in 2020 and prior may not apply since its now a different product inside...
This was mine and my attempt at the mod:
View attachment 114705
This is a pic from the ancient PDF floating around showing the old style of the board and what to change:
View attachment 114706
No dice for me and so far don't like the mic as it came out of the box, but that is just my 2 cents, it's only $15 to try.