[criageek]

Another great day for the 47-1230! I decided to yank the chassis and speaker out of the cabinet and throw it back on the bench to see if I could fix the FM tracking problem. It turns out that I had expanded the loops in the oscillator coil (L406 on the Philco schematic) when I was fiddling with it. Since the dial face is mounted in the cabinet I took some measurements and put marks on the backing plate at the frequencies I was interested in and started a long, iterative process of compressing the coil so a station at the low end of the dial (94.1) was in the right place on the dial, then going to a station at the high end (104.5) and adjusting the oscillator trimmer (C405C on the Philco schematic) to set that station to the right place on the dial. I had to do this maybe 12 - 14 times but I finally got it dialed in. When I put it back in the cabinet it's very nearly spot on. It's accurate at 104.5 and at the low end it's less that 1/2 the width of the needle low...close enough for me.

Now the only remaining issue is that there are several stations that are supposed to be at the low end of the band (88 - 91) that I receive at the high end. For instance, I receive 90.9 at 90.9 as I should, but also at 108. I really don't have any idea how to fix this so my plan is to leave it as is and live with it. But if someone can give me any ideas what I could try I may pull it back out and see if I can fix that. Otherwise, I'm planning to take it to my Mom's place on the 31st and call this job complete!

Rich