08-01-2017, 12:28 PM
I worked thru the tone control issue. I had missed a capacitor value change in one of the bulletins. Tone control works so that I can hear the difference now.
I moved on to removal of the tuning condenser, mostly to clean it up. But the rubber bushings needed replacement as well. My old trusty Weller 250 watt gun made short work of desoldering the braid from the mounting screws.
I installed the new tuning dial, from Radio Daze. I used 1/8" x 1/16" grip copper pop rivets to attach the dial to the tuning wheel. I am not real sure that I would mount it that way again. The rivet will interfere with the tuning counter shaft unless it is peened down on the inside. I looked into small machine screws too, and they present the same problem. If you peen the rivet too tightly the plastic dial may crack.
The tuning dial looks good, except, the lettering is printed on the front side. There are already signs of the lettering flaking off in places. Because the sliding mask does have felt pads for contacting the dial, I am a little concerned that the lettering might be rubbed off. I suppose time will tell on this.
Does anyone have a recommendation for a replacement rubber "tire" that will work on the dial drive wheel? I have already replaced the rubber components in the rest of the tuning drive, with O-rings. I have installed a large cross section O-ring on the tuning dial meter, for now, but don't know how well it will continue to work.
The tuning shadow meter works, kind of. The coil is good, and I can see some movement when tuning strong stations, it isn't right. I think part of the tuning vane has broken off. There is only a short piece remaining at the pivot point, maybe 1/4"-3/8" long remaining. I have it on the bench right now, and have been staring at it for a while. It looks way too delicate for me, with my hand shake, to attempt a repair. I am thinking that something is better than nothing, if I were to screw it up by attempting a repair.
Regarding the tuning meter coil, it looks like all the B+ for the IF is going thru the coil. Is there a mod out there for shunting the coil to remove some of the load from the coil, and still have a reasonably working meter. (I assume adding any shunt will remove the sensitivity of the meter.)
Thanks for reading.
I moved on to removal of the tuning condenser, mostly to clean it up. But the rubber bushings needed replacement as well. My old trusty Weller 250 watt gun made short work of desoldering the braid from the mounting screws.
I installed the new tuning dial, from Radio Daze. I used 1/8" x 1/16" grip copper pop rivets to attach the dial to the tuning wheel. I am not real sure that I would mount it that way again. The rivet will interfere with the tuning counter shaft unless it is peened down on the inside. I looked into small machine screws too, and they present the same problem. If you peen the rivet too tightly the plastic dial may crack.
The tuning dial looks good, except, the lettering is printed on the front side. There are already signs of the lettering flaking off in places. Because the sliding mask does have felt pads for contacting the dial, I am a little concerned that the lettering might be rubbed off. I suppose time will tell on this.
Does anyone have a recommendation for a replacement rubber "tire" that will work on the dial drive wheel? I have already replaced the rubber components in the rest of the tuning drive, with O-rings. I have installed a large cross section O-ring on the tuning dial meter, for now, but don't know how well it will continue to work.
The tuning shadow meter works, kind of. The coil is good, and I can see some movement when tuning strong stations, it isn't right. I think part of the tuning vane has broken off. There is only a short piece remaining at the pivot point, maybe 1/4"-3/8" long remaining. I have it on the bench right now, and have been staring at it for a while. It looks way too delicate for me, with my hand shake, to attempt a repair. I am thinking that something is better than nothing, if I were to screw it up by attempting a repair.
Regarding the tuning meter coil, it looks like all the B+ for the IF is going thru the coil. Is there a mod out there for shunting the coil to remove some of the load from the coil, and still have a reasonably working meter. (I assume adding any shunt will remove the sensitivity of the meter.)
Thanks for reading.
Chris H
N9WHH
