11-14-2021, 03:23 PM
All caps are installed, and I am re-wiring their interconnect as the repair done some time in possibly 40s was using twisted soldered together wires and black tape over the soldering.
I am slowly getting rid of those plus the caps that were installed over the existing backelite blocks or instead of the 4-section electrolytic.
Also I am not sure about the wire-wound divider: the schematic says 20-100-130 and mine is 20-170-200 ohms or close to that. What bugs me is the fact that the wire-wound resistors typically do not age value-wise. They either OK or they are not. If they are, their value is within tolerance and usually is the same as it was the day of manufacturing. So at this point I am not yet ready to add bypasses until I hear from the folks who have experience dealing with this chassis. I only fixed one 16, the 16B cathedral, and the chassis is different. Even if the resistor is the same.
Chugging along.
Finished the recap.
One of the wires that went to the 4 section cap did not belong there. It was supposed to use a nearby backelite blok's free solder lug as a solder post but instead somehow went to the electrolytic cap. I wonder if this radio was indeed working after that repair.
Now the resistors.
Right from the start the 13K-10K divider (the big resistor) is off, being 17K-13K. I replace when I can, else I parallel a resistor to get to the target value. Some values go up twice.
The cap, 1500pF, that couples the oscillator to the 1st detector, where it has two resistor and the cap connected, had another 470pF more modern ceramic cap soldered with the other lead going nowhere.
Well, today has been productive. Main thing, the electrolytics have been rebuilt and wired; this is the operation I like the least: cutting the open, cleaning, etc. Way less fun than restuffing the backelite blocks.
I am slowly getting rid of those plus the caps that were installed over the existing backelite blocks or instead of the 4-section electrolytic.
Also I am not sure about the wire-wound divider: the schematic says 20-100-130 and mine is 20-170-200 ohms or close to that. What bugs me is the fact that the wire-wound resistors typically do not age value-wise. They either OK or they are not. If they are, their value is within tolerance and usually is the same as it was the day of manufacturing. So at this point I am not yet ready to add bypasses until I hear from the folks who have experience dealing with this chassis. I only fixed one 16, the 16B cathedral, and the chassis is different. Even if the resistor is the same.
Chugging along.
Finished the recap.
One of the wires that went to the 4 section cap did not belong there. It was supposed to use a nearby backelite blok's free solder lug as a solder post but instead somehow went to the electrolytic cap. I wonder if this radio was indeed working after that repair.
Now the resistors.
Right from the start the 13K-10K divider (the big resistor) is off, being 17K-13K. I replace when I can, else I parallel a resistor to get to the target value. Some values go up twice.
The cap, 1500pF, that couples the oscillator to the 1st detector, where it has two resistor and the cap connected, had another 470pF more modern ceramic cap soldered with the other lead going nowhere.
Well, today has been productive. Main thing, the electrolytics have been rebuilt and wired; this is the operation I like the least: cutting the open, cleaning, etc. Way less fun than restuffing the backelite blocks.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.