10-12-2014, 01:17 PM
Thanks for the help. The findatube did not have an fm-1000. The place that said it had the tube, where I ordered two, called and said they could not find one. On the bright side, After replacing two known bad tubes, It is working on AM. I live in a home sided with aluminum and we have a metal roof. I can barely get our in town station without and outside antenna. While tuning up the 48-482 I discovered a station I had never heard before. It was 100 miles away. This was with chassis out and the internal loop disconnected. Gad, They really knew how to design a radio back then. I would like to get the fm band working, but I will live without it if I cannot get the tube. I put in new dial lamps. I was tempted to use LEDs like I do on everything else. I realized the colour would never come out right. I am sticking with incandescent. I will keep checking on ebay. I keep thinking of the history this radio must have had. What news programs played through that old speaker. I have not yet aligned the dial. The service manual has a picture of the dial which I will print out to exact scale. I will then tape it onto the dial background and align the frequencies. The voltages all check out according to the manual. I have not even used a scope on it yet. I cannot understand why my portable transistor radios can barely get our local station here. I would think that my one expensive transistor radio that is good for shortwave would at least work as well as this old Philco. I would assume that in 66 years, there would be great design improvements. Go figure.
This radio seems to have no AGC. Tuning in a strong station results in overdriving the audio. The volume control then works to correct this. I do not see a feedback path in the print. Am I missing something? Let me know if you any knowledge of this.
Thanks Again,
Michael
This radio seems to have no AGC. Tuning in a strong station results in overdriving the audio. The volume control then works to correct this. I do not see a feedback path in the print. Am I missing something? Let me know if you any knowledge of this.
Thanks Again,
Michael