Well I guess the "technical angels" have come to my rescue!

I was trying to figure out if the 2M trimmer was working, or if it was broken - those dang things are so easy to break!

So I flipped my bad boy over and tried measuring from the bottom left two points under the pcb - the resistance varied from about 182K at the 2M position, to 0. So I knew the trimmer was working, but I realized you can't tell the right value of the trimmer with it installed. I wanted to set it to 300k per schematic. Problem was, it was a bear removing the last one, and the pcbs gets nasty after too many lifts of components.

So I used maths. I said, "the whole mic has got to be a parallel resistance with this trimmer. Let me discover the whole mic resistance."

I used 1/Rtot = 1/R1 + 1/R2

1/182K=1/Trimmer Tot (2M) + 1/R2

R2 came to 200.2K, representing the rest of the mic total resistance in series with the pot.

Armed with this, I then calculated what the trimmer would need to be to set it to 300K:

1/R? = 1/200.2K + 1/300K

R? = 120K, which represented the value the trimmer needed to measure to be set internally to 300K.

So I screwed it down to 120K and then took measurements...

OMG!

43v over the plate! Using 100k resistor, 72.5mA current!

I had used a trimpot for the 100K earlier, and had decided to set it to exactly 100K and did so. Since it worked, I replaced the pot with a 100K resistor, and I'm still getting the right values!

My guess is, the R7 trimmer is very susceptible to the IPA and the flux remover; perhaps the values it was putting out for R7 before were screwed up - because I didn't change anything! I guess simply waiting a few hours did the trick...

Anyway, I'll report back after I get the capsule in and...do the first audio test!

Thanks for your patience guys!

Mike