[Hallicrafters] Speaking of Resistors

[Robert Sauvan]

Hi all,
As you are all aware, we had a very good education in checking and 
replacing resistors last week. I put the SX-101 back in service and am 
finding it to be working quite well up to this point. I have now brought 
the HX-50 onto the workbench to try to locate the chirp I have in this 
rig. I know its not Hallicrafters, but Im sure all of you are familiar 
with this unit. So, I started troubleshooting and decided to start 
checking resistors after my lesson from last week. One particular 
resistor in the K101 relay looked to be somewhat suspicious. It had a 
kinda shiny surface and very very small bubbles or bumps on the surface 
so I decided it must have gotten hot at one point. The manual called for 
a 47K
2 watt resistor in this circuit. The bands on the resistor in the radio 
indicated it was a 41K. When I put my meter on it, it showed about 54 
ohms. Wow, it was way high as I was told bad resistors will show as they 
get old and in a circuit. I picked up a new resistor today with the 
correct spec as the manual indicated it should be. I cut the old 
resistor out and rechecked it. It measured almost 58 ohms out of the 
circuit so it is definitely bad. I replaced it and fired up the rig and 
my oscilloscope shows a nice waveform. The waveform previously had been 
a bit skewed so I dont know if that is what a chirp looks like on the 
scope or not. I have not monitored the signal as of yet because my shack 
is a bit far away to hear it in one of my receivers. I have ordered all 
new electrolytics for this radio since I have the case open and plan to 
replace them since it would be a good time. They should be here tomorrow 
so I will replace them and put this thing back on the air and see if I 
get any more 579"C" signal reports. Lesson well learned and executed.

We thank you-Bob-W0YBS