11-21-2021, 11:00 PM
Have rebuilt the tone control.
This is fairly easy as all three caps are the same, 3nF. The original caps all rose in value to 8nF, all three, so it would give 8-16-24nF, whereas it should be 3-6-9. I have 3.3nF, so it is close.
Extracting it was a bit tough - I had to de-solder one of the mica caps that kept the part from being able to come out.
I tried to remove the shaft but the chassis holding fixture I am using is a bit flexible and so pressing on the retaining clip, in order to remove it, was unsuccessful. So I removed it as a whole.
I was able to remove the clip once it was out, in order to clean it. Lots of black came off.
Then I made a new insulating insert from fish paper.
Twisted together three 3.3nF caps.
Soldered the wires and situated them inside the fish paper cradle.
Then covered the caps with fish paper caps to protect from hot glue. I always to this when rebuilding caps or tone controls. The hot glue will still penetrate, but very little. But it will be enough of it around to stabilize and hold stuff and the wires.
And then I potted it with brown hot glue.
Then reinserted the shaft.
I used a new Jesus clip (an E-clip): I have large assorted kit, and then these are easier to remove and install. Which proved handy when I realized it is easier to install the tone ctl without the shaft and then insert it later.
Caps are done.
This is fairly easy as all three caps are the same, 3nF. The original caps all rose in value to 8nF, all three, so it would give 8-16-24nF, whereas it should be 3-6-9. I have 3.3nF, so it is close.
Extracting it was a bit tough - I had to de-solder one of the mica caps that kept the part from being able to come out.
I tried to remove the shaft but the chassis holding fixture I am using is a bit flexible and so pressing on the retaining clip, in order to remove it, was unsuccessful. So I removed it as a whole.
I was able to remove the clip once it was out, in order to clean it. Lots of black came off.
Then I made a new insulating insert from fish paper.
Twisted together three 3.3nF caps.
Soldered the wires and situated them inside the fish paper cradle.
Then covered the caps with fish paper caps to protect from hot glue. I always to this when rebuilding caps or tone controls. The hot glue will still penetrate, but very little. But it will be enough of it around to stabilize and hold stuff and the wires.
And then I potted it with brown hot glue.
Then reinserted the shaft.
I used a new Jesus clip (an E-clip): I have large assorted kit, and then these are easier to remove and install. Which proved handy when I realized it is easier to install the tone ctl without the shaft and then insert it later.
Caps are done.
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.