08-17-2013, 09:15 PM
OK,
Yesterday I tried some adjustment, did not quite work first, though the radio was alive and even was attempting some reception, then I remembered I doubted that I connected the antenna coils correctly, so I revised it, swapped the coils, adjusted them again today, and received my local station loud and clear where it should be.
Then I adjusted the rest, all worked, then I turned the chassis on its side, and the adjustment went to crap, so I thought awhile, wiggled one of the tubes, the IF stage, the adjustment was sensitive to it, then lowered the gen signal to the smallest possible where it could be barely heard at all and adjusted more by ear than by voltmeter.
After that I have BC working fine, plenty stations, loud and clear and now that the night came, I have plenty of SW Foreign BC reception (considering it is only to 7 MHz).
So, the rewound coil obviously works, and the other one that looks a bit dark obviously works fine also. Actually the way we figured the second coil was OK was simple - we soldered a cap across, excited it with a square pulses and saw the oscillation at a plausible frequency.
I hope this is the end of it, come Monday I will bring it back to work and give it away.
That was the quickest restoration I have done.
Yesterday I tried some adjustment, did not quite work first, though the radio was alive and even was attempting some reception, then I remembered I doubted that I connected the antenna coils correctly, so I revised it, swapped the coils, adjusted them again today, and received my local station loud and clear where it should be.
Then I adjusted the rest, all worked, then I turned the chassis on its side, and the adjustment went to crap, so I thought awhile, wiggled one of the tubes, the IF stage, the adjustment was sensitive to it, then lowered the gen signal to the smallest possible where it could be barely heard at all and adjusted more by ear than by voltmeter.
After that I have BC working fine, plenty stations, loud and clear and now that the night came, I have plenty of SW Foreign BC reception (considering it is only to 7 MHz).
So, the rewound coil obviously works, and the other one that looks a bit dark obviously works fine also. Actually the way we figured the second coil was OK was simple - we soldered a cap across, excited it with a square pulses and saw the oscillation at a plausible frequency.
I hope this is the end of it, come Monday I will bring it back to work and give it away.
That was the quickest restoration I have done.
