A happy ending...
Well, I finally had the time to pull the chassis back out and go through the process of peaking up the sound IF stages. The sound is so much stronger now! I can even use my DTV converter and get plenty of volume, even with low contrast. Thanks to all for pointing me in the right direction and the links to the how-to videos. This was the first TV I've ever done and it has been (and still is) quite a learning experience.
One odd thing I noticed: when peaking the upper coil in the first stage, I would approach the peak and just before getting it there is a sudden drop off. When I turn a bit beyond it, the voltage comes back and I get the sweet spot. What could be causing this? I turned the core back and forth and I hit this drop off every time...
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