02-07-2015, 10:26 PM
I worked on the 39-770 literally all day today. It doesn't look like I did much, but I made some major strides towards completion of this project.
I mentioned in post #41 above what I did last night to this chassis. I began this morning by replacing the remaining resistors on that long terminal strip on the right side of the chassis, near the set's power transformer. I also had to remove the reactor/transformer in the tuning lamp circuit and attach new wires to it.
I ran new wires to where they will attach to the input electrolytic capacitor once I have restuffed and reinstalled it.
And, yes, the bakelite block was restuffed with new X/Y safety caps.
Here is how the right side of the chassis looked when I had done all of that:
[Image: http://www.philcoradio.com/images/phorum...770-32.jpg]
I then moved to the top of the chassis and replaced the wires running to the power switch, rebuilt the right side dial lamp, and attached a new wire to the tuning lamp. Later on, I flipped the chassis back over and attached the power switch leads, dial lamp lead and tuning lamp lead.
I also made a new speaker wiring harness and attached those wires inside the chassis.
While I was working above the chassis, I replaced the grid leads at the tuning condenser, and also replaced the two 250 pF mica caps and 1 meg resistors connected at the tuning condenser.
[Image: http://www.philcoradio.com/images/phorum...770-33.jpg]
Once all of that was done, I decided to attach a power cord, install new dial lamps, and turn it on with no tubes installed, just to see the dial illuminated.
Here it is:
[Image: http://www.philcoradio.com/images/phorum...770-34.jpg]
[Image: http://www.philcoradio.com/images/phorum...770-35.jpg]
After that, I removed the dial scale, wrapped it in a towel and put it in a safe place. Now that I'm nearing the home stretch, I don't want anything to happen to it!
The next job is to rewire and clean up the two IF transformers. Next will be final wiring at the RF and det-osc tubes, then install any remaining capacitors, and finally restuff and install the electrolytics.
Barring any coil issues, this set should be singing again sometime this coming week.
I mentioned in post #41 above what I did last night to this chassis. I began this morning by replacing the remaining resistors on that long terminal strip on the right side of the chassis, near the set's power transformer. I also had to remove the reactor/transformer in the tuning lamp circuit and attach new wires to it.
I ran new wires to where they will attach to the input electrolytic capacitor once I have restuffed and reinstalled it.
And, yes, the bakelite block was restuffed with new X/Y safety caps.
Here is how the right side of the chassis looked when I had done all of that:
[Image: http://www.philcoradio.com/images/phorum...770-32.jpg]
I then moved to the top of the chassis and replaced the wires running to the power switch, rebuilt the right side dial lamp, and attached a new wire to the tuning lamp. Later on, I flipped the chassis back over and attached the power switch leads, dial lamp lead and tuning lamp lead.
I also made a new speaker wiring harness and attached those wires inside the chassis.
While I was working above the chassis, I replaced the grid leads at the tuning condenser, and also replaced the two 250 pF mica caps and 1 meg resistors connected at the tuning condenser.
[Image: http://www.philcoradio.com/images/phorum...770-33.jpg]
Once all of that was done, I decided to attach a power cord, install new dial lamps, and turn it on with no tubes installed, just to see the dial illuminated.
Here it is:
[Image: http://www.philcoradio.com/images/phorum...770-34.jpg]
[Image: http://www.philcoradio.com/images/phorum...770-35.jpg]
After that, I removed the dial scale, wrapped it in a towel and put it in a safe place. Now that I'm nearing the home stretch, I don't want anything to happen to it!
The next job is to rewire and clean up the two IF transformers. Next will be final wiring at the RF and det-osc tubes, then install any remaining capacitors, and finally restuff and install the electrolytics.
Barring any coil issues, this set should be singing again sometime this coming week.
--
Ron Ramirez
Ferdinand IN