10-19-2015, 09:02 AM
Brett,
I just finished a Philco 60 restore. I had to rewind that outer winding 1 & 5 like you did. Mine is exactly like yours. About 7 turns clockwise from the bottom. Based on the 11.4 ohms from the top of the coil, I think your primary (left side) sounds good.
I also had to rewind the windings between 4 & 3 and 3 & 2. The 3 &2 winding connects into the 4 & 3 winding right at a spot underneath the plastic insulator under all that crud. The wires drop down through the hole and meet at one of the pins I believe. Mine was completely open. I had no continuity on the 3 & 2 winding. I don't know if that is your problem or not. But it would require that you remove the 1 & 5 winding and cleaning it up, removing the plastic insulator, the crud, etc.
The 3 & 2 winding is much thicker wire. I used 32 ga., but I bet it is even something more like 30. My notes say 25 turns CW looking from the bottom starting at pin 2. But if you do it, you should use this information to double check what you see on yours. I don't want to be responsible for giving you incorrect info.
Like others have said above, you should be able to get some reception with just some wire attached to the grid of the 6A7. If you don't, the antenna coil may not be your biggest problem.
Also, I tend to disagree that you need 20 ft of antenna wire and a ground. I work in my basement, and usually with 3-4 ft. of antenna wire, I get pretty decent reception. I have never tried a ground.
Mark K8KZ
EDIT: The resistance between 6 & 4 also sounds strange. My measurement was pretty close to right on. I didn't rewind that. It is the winding at the very top of the coil form. Maybe a couple dozens turns of the thick wire. Maybe a visual inspection would be a place to start with that.
Another thought... If you have a signal generator, apply a 1200 Khz modulated signal (as low level as possible with the volume turned up to max) to the cap of the 6A7. Tune it in and and try peaking the IF condensers. Basically align the IF. Certainly if the IF passband is off, you may not get much reception and that is all downstream from your antenna coil. I don't know if you have done that or not.
I just finished a Philco 60 restore. I had to rewind that outer winding 1 & 5 like you did. Mine is exactly like yours. About 7 turns clockwise from the bottom. Based on the 11.4 ohms from the top of the coil, I think your primary (left side) sounds good.
I also had to rewind the windings between 4 & 3 and 3 & 2. The 3 &2 winding connects into the 4 & 3 winding right at a spot underneath the plastic insulator under all that crud. The wires drop down through the hole and meet at one of the pins I believe. Mine was completely open. I had no continuity on the 3 & 2 winding. I don't know if that is your problem or not. But it would require that you remove the 1 & 5 winding and cleaning it up, removing the plastic insulator, the crud, etc.
The 3 & 2 winding is much thicker wire. I used 32 ga., but I bet it is even something more like 30. My notes say 25 turns CW looking from the bottom starting at pin 2. But if you do it, you should use this information to double check what you see on yours. I don't want to be responsible for giving you incorrect info.
Like others have said above, you should be able to get some reception with just some wire attached to the grid of the 6A7. If you don't, the antenna coil may not be your biggest problem.
Also, I tend to disagree that you need 20 ft of antenna wire and a ground. I work in my basement, and usually with 3-4 ft. of antenna wire, I get pretty decent reception. I have never tried a ground.
Mark K8KZ
EDIT: The resistance between 6 & 4 also sounds strange. My measurement was pretty close to right on. I didn't rewind that. It is the winding at the very top of the coil form. Maybe a couple dozens turns of the thick wire. Maybe a visual inspection would be a place to start with that.
Another thought... If you have a signal generator, apply a 1200 Khz modulated signal (as low level as possible with the volume turned up to max) to the cap of the 6A7. Tune it in and and try peaking the IF condensers. Basically align the IF. Certainly if the IF passband is off, you may not get much reception and that is all downstream from your antenna coil. I don't know if you have done that or not.
