09-22-2015, 09:25 AM
Okay, many thanks to Chuck for setting me up with the correct documentation for the radio. Sure enough, Service Bulletin 268a contained all the needed secrets. What a difference the correct documentation makes!
On my sensitivity issue, turns out, my problem is an open RF coil between the RF amplifier section and the Detector/Oscillator section. It's killing the sensitivity on bands 1 and 2. Of course the open is in the super-fine 6.5Ω section of the coil, and not the thick, .5Ω section that would be super-easy to fix. I unwound some of the wire from both ends of the 6.5Ω section, and the break is sadly not near the ends as I had hoped. Looks like I'm in the market for a replacement…
http://philcoradio.com/phorum/showthread.php?tid=13163
Interestingly, the Code 125 RF alignment instructions have you start at 1600kc, versus 18mc on the Code 121 chassis.
On my sensitivity issue, turns out, my problem is an open RF coil between the RF amplifier section and the Detector/Oscillator section. It's killing the sensitivity on bands 1 and 2. Of course the open is in the super-fine 6.5Ω section of the coil, and not the thick, .5Ω section that would be super-easy to fix. I unwound some of the wire from both ends of the 6.5Ω section, and the break is sadly not near the ends as I had hoped. Looks like I'm in the market for a replacement…
http://philcoradio.com/phorum/showthread.php?tid=13163
Interestingly, the Code 125 RF alignment instructions have you start at 1600kc, versus 18mc on the Code 121 chassis.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
