Philco FM detector trans help needed

[DavGoodlin]

Originally Posted by Don Lindsly

I can look up the Automatic Coil application notes. I need to know:
1. Is the AM IF also included in the coil?
2. Is the circuit a discriminator or ratio detector?
3. Is the coil mounted on a PC board?
4. Confirming OEM Automatic Coil Mfr# 119 preceding the date code.
Don

Thanks Don,
The Am is not included (but somehow affected) and the function of the 6BJ7 is listed as a discriminator
and transformer is mounted on a PC board.
Yes, the 119 preceeds datecode as 119-61-36

My last resort will be to pull the same transformer out of my yet untested Philco RT-400 tuner, disconnect coil and measure the bases built-in capacitance.

[jr_tech]

Originally Posted by DavGoodlin

The Am is not included (but somehow affected)

Just a WAG, but I suspect that there is something more going on here then capacitor values being a little off. Perhaps a run was broken or an old cold solder joint was disturbed.

jr

[Don Lindsly]

The Automatic Application Notes show 33uuf between terminals 1 and 2, 33uuf plus 16uuf between 3 and 4 and 33uuf between terminals 3 and 6. The 16uuf may vary depending on external capacities.

jr_tech makes a point. Check for built in trouble.