03-08-2014, 10:31 AM
just read some more of the posts and a few more comments....NONE of the measurements suggested in the manual match my radio and yet it plays perfectly.....and I have changed, checked and rechecked every wire, cap and resistor in the radio and still get different readings.....I also noticed that the voltage reading on the schematic seem to differ from those outlined in the trouble shooting for section one. So after almost loosing my mind....I have the radio working great but no explanations. I looked for service bulletins and thought that perhaps there were some modifications made by thecompany to later or earlier chassis in the production runs.... I found nothing to explain it...Once again someone out there may have an explanation. This was my first Philco and found it extremely quirky with all of the bakelite blocks, three lead capacitors (be sure to check the one in the 1230 for the FM section) and variations or differences in the service manual.
Second....I still have undesireable hum in my radio. I rerouted all of the wires as close as possible to the underside of the radio as this is a known cause for hum and am using slightly larger value filter caps. Still some hum......Here is what I think at this point.....this chassis is so crowded that it is suseptable to hum. The power cord usually attached to components where it enters the chassis is routed accross the chasis from back to the front and under the transformer......to the one bakelite block. By the way, the two .01 caps in this block must be changed out with "safety" caps as they are directly attached to the AC. Anyway, as one poster mentioned the hum may be caused by the environment and this radio is more suseptable than most to picking up AC noise from lights, building structure etc. I do notice that when I play the phono section with my iPod that there is still a bit of hum but much less..so I think that this would tell you the problem is with reception interference form the old 60 cycle hum thing.....I also would love to hear what others think about this......
Second....I still have undesireable hum in my radio. I rerouted all of the wires as close as possible to the underside of the radio as this is a known cause for hum and am using slightly larger value filter caps. Still some hum......Here is what I think at this point.....this chassis is so crowded that it is suseptable to hum. The power cord usually attached to components where it enters the chassis is routed accross the chasis from back to the front and under the transformer......to the one bakelite block. By the way, the two .01 caps in this block must be changed out with "safety" caps as they are directly attached to the AC. Anyway, as one poster mentioned the hum may be caused by the environment and this radio is more suseptable than most to picking up AC noise from lights, building structure etc. I do notice that when I play the phono section with my iPod that there is still a bit of hum but much less..so I think that this would tell you the problem is with reception interference form the old 60 cycle hum thing.....I also would love to hear what others think about this......
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