I didn't have a smooth run with this project, despite the best of help. Here's how it sounds now:
My tuning is very sensitive but at least it doesn't drift like it was with the original (not NP0) capacitors.
I ran into a few issues along the way that took me way too long to debug:
- The audio chain was taking off at about 2MHz and upsetting the VFO via the power line.
- I didn't use NP0 caps in the VFO and it was incredibly unstable at first.
- The variable linear power supply I was using caused great audio hum - no idea why - another supply and the hum is gone.