[wonderwrench]

Hi all, I'm new to this forum I just found it while looking for some info on repairing a Philco 37-61. Now on to my question, I have been working on this radio for some time and can not get it to perform like it should. It will not bring in stations very well down below 800kc, but if I attach the antenna to the grid of the first tube 6a8g it will work much better. I have tried to align it over and over without any improvement. also the trimmer cap for the antenna transformer must be backed out all the way for best results. I have tested the antenna transformer for opens etc.. and it is ok. By hooking up the antenna to the grid of the 6a8g, what i'm doing is bypassing the antenna transformer, why would the radio work better when I bypass a part? I have been able to adjust the osc. so that a station that broadcasts on 680 comes in at 750kc and it comes in much better but when I "chase" it down the dial by adjusting the osc. alittle then retuning it back in-readjust the osc-retune the staition-adjust the osc-retune etc... by the time Iget it down close to 680 on the dial it will be so weak it hardly comes in.
On other sites someone asked if my signal generator was any good and said I should test it aganist a digital radio, so I did and found that it's output was very broad, allover the band, so I tried another signal generator. not much inprovment if any.
Thanks for any help
Tom
Maryland

My 620 had a similar problem. I never did find the actual cause though the trimmers may have degraded over time. I did find that changing the dial scale positioning allowed the trimmers to work as designed. This also corrected dial scale error and overall tracking of the radio. I'd try aligning the radio like you did when 680 came in at 750 then move the dial scale so 680 comes in at 680 then see how the radio performs. You may have to play with moving the dial scale slightly one way or another to get the best tracking. I ended up with the dial scale approx 1/4 inch below the cal line on the bottom of the dial scale.