06-09-2013, 01:22 AM
The field coil is good. Nothing on this radio would work if it weren't.
That being said, I DID find something in the notes for this chassis about a production change where a .18 cap was added from the 42 screen grid to the positive of the first filter cap. Essentially, this equates to a screen bypass cap. Installing this brought the audio up about 300% or so. Much MUCH better. It did change the timbre of the sound some, but it's not unpleasant, just not as much low end as there was before. If I wanted, I could put another small cap across the input grid of the 42, or across the output transformer.
Now, all it seems that I need is to replace the on/off/volume control, a 20K unit. I'm having a bit of trouble finding a 20K with switch that has the requisite shaft length.
One other question, though: How the devil am I getting double peaks tuning from the middle of the band up, when there is only one tuned stage in the IF? I've been able to reduce this a bit by working the LO and ANT trimmers on the tuner back and forth a bit, but can't seem to completely eliminate it. Otherwise, the gain of the radio is quite good and I can now receive most of my "locals" without any antenna at all.
That being said, I DID find something in the notes for this chassis about a production change where a .18 cap was added from the 42 screen grid to the positive of the first filter cap. Essentially, this equates to a screen bypass cap. Installing this brought the audio up about 300% or so. Much MUCH better. It did change the timbre of the sound some, but it's not unpleasant, just not as much low end as there was before. If I wanted, I could put another small cap across the input grid of the 42, or across the output transformer.
Now, all it seems that I need is to replace the on/off/volume control, a 20K unit. I'm having a bit of trouble finding a 20K with switch that has the requisite shaft length.
One other question, though: How the devil am I getting double peaks tuning from the middle of the band up, when there is only one tuned stage in the IF? I've been able to reduce this a bit by working the LO and ANT trimmers on the tuner back and forth a bit, but can't seem to completely eliminate it. Otherwise, the gain of the radio is quite good and I can now receive most of my "locals" without any antenna at all.
