I spent some more time looking at the filter as well as comparing it to the one that originally came out of my HQ-129X. First off, two of the resistors are out of specification. One 300 ohms reads about 600 ohm and one 2.2k reads about 2.7k. Secondly, the mica I removed from one of the inductors had a code that read (from left to right) grey, green and black. That would make this an 82pf capacitor, correct?
I've also noticed three differences between the two units.
First off, you'll see the arrangement of resistors on the selectivity switch. On the stock unit from the HQ-129X you'll see the 2.2k resistor is connected in line with all of the other resistors whereas on the 120X unit you'll see it connects straight to the crystal filter inductor. Why is this so?
In the second photo you'll see on the 120X unit on the right there is a 10k resistor connecting from the wafer switch down and out to the radio whereas on the 129X unit on the left there is no resistor.
In the third photo you will see that the 120X unit on the right has a .02mfd capacitor from the phasing capacitor to where that aforementioned 10k resistor connects to whereas the 129X unit on the left has no such capacitor. The capacitor on the 120X unit is stock but I have replaced the original as it was a wax paper unit.
Resistor arrangement:
129X:
http://i.imgur.com/sAGdsEj.jpg120X:
http://i.imgur.com/Z2HfqYc.jpg10K resistor on wafer switch:
129X:
http://i.imgur.com/TDLt0qb.jpg120X:
http://i.imgur.com/FApEsKN.jpg.02 capacitor:
129X:
http://i.imgur.com/wg8iaUa.jpg120X:
http://i.imgur.com/Ouym7Ot.jpg