Rca 721ts

[Adam]

I've been having similar problems. I just tried the method over on the Admiral thread with the loops of wire around the oscillator tube. First I tried just a few turns of bare wire, and got nothing. I could only get it to work after putting as many turns of wire as would fit on there, using insulated wire, so I wouldn't have to worry about the different turns touching each other, and then taped in all in place. I could get a reading on channels 1, 2 and 3. With the higher frequencies for the other channels, it either would be erratic, or I got nothing at all.

Adjusting the fine tuning from one end to the other, I got 71.70-71.06 MHz for ch 1, 80.42-79.70 ch 2 , and 85.65-83.00 ch 3. Channel 1 is nearly right on, channel 2 and 3 read a bit low. But I'm not sure how accurate this is anyway, I don't think the frequency counter can deal well with something at such a low voltage. And because channel 1 reads nearly right on, and channel 1 is not working correctly, it is recieving 92.3 FM, I would think the problem would be elsewhere.

Is there any way to improve this set up to get more accurate readings? Here's a pic of what I did below.