07-24-2017, 04:53 PM
This is my 3rd Philco 53-1750 I am aligning but having a problem with this recent one so I have some questions.
The way I had been doing it successfully was to attach a 6" wide loop wire wound 5X attached to the signal generator and hang it near the antenna of the radio. I then place the radio on 1620 Khz and the radio picks of the signal generator, which I can hear in the radio speaker, at 455 Khz, after which I adjust all the tuning capacitors. Has worked great in the past.
This current radio, was picking up only one station very weak at 1000 KHz. This radio will not pick up the 455 KHz signal using my former method. I tried aligning the radio using the one station at 1000 Khz I could get by turning the tuning capacitors until it came in louder, and then was able to received several more stations -but still all coming in weak. I then went back to 1620 Khz to see if I could get the radio to give a signal at 455 Khz, and still nothing. All tubes test as good and I do not have an oscillascope.
Alignment procedures for this model recommend hooking up the signal generator to one of the pins of the output tube (I think it's the 7A8 tube), with a .01 mf capacitor. I wonder if this would work better to receive the 455 Khz signal rather than just the loop wire method. Photo I attached is the same radio I have but it not mine - mine is CLEAN ! Thanks....
The way I had been doing it successfully was to attach a 6" wide loop wire wound 5X attached to the signal generator and hang it near the antenna of the radio. I then place the radio on 1620 Khz and the radio picks of the signal generator, which I can hear in the radio speaker, at 455 Khz, after which I adjust all the tuning capacitors. Has worked great in the past.
This current radio, was picking up only one station very weak at 1000 KHz. This radio will not pick up the 455 KHz signal using my former method. I tried aligning the radio using the one station at 1000 Khz I could get by turning the tuning capacitors until it came in louder, and then was able to received several more stations -but still all coming in weak. I then went back to 1620 Khz to see if I could get the radio to give a signal at 455 Khz, and still nothing. All tubes test as good and I do not have an oscillascope.
Alignment procedures for this model recommend hooking up the signal generator to one of the pins of the output tube (I think it's the 7A8 tube), with a .01 mf capacitor. I wonder if this would work better to receive the 455 Khz signal rather than just the loop wire method. Photo I attached is the same radio I have but it not mine - mine is CLEAN ! Thanks....
