05-19-2009, 01:47 AM
If necessary, you can test your set without using the pushbuttons assembly,period. Those are only used for station-presets when the PB/ switch(s) are depressed. I have found many bad contacts points in the old P/B assys, nomatter how clean they are! Some are completely un-reliable, no matter how much you clean them,period!
To bypass this potential-prob, is by following your schematic closely to where the points of "manual-tuning" engages in the old Pushbutton assy, then using a jumper-wire with a alligator-clip on each end, to bypass the switch assy altogether. Make sure your getting good contact for "manual-tuning" only, ( according to your schematic),then once you get your set working properly, you can go back and check your P/B switches later, and those small coils (small screws) will need to be tuned one at a time using a RF gen, or by ear, across the band, one at a time in khz steps corresponding to each coil(s), for your local stations broadcast khz (s).
Once you completely by-pass your pre-set buttons, and make sure your tuning your receiver by hand, turning the variable condenser, you will know you have the set ready to receive stations, once other probs are corrected first.
I would still suspect any corroded tube-pins on any of your local-type base tubes for bad recept!, since you already carefully recapped your set. Also, make sure your antenna is working properly, no shorts, & if need be for test, use a pc of wire approx 5'-10' long, to bypass your orig antenna, to the chassis' main antenna terminal, to receive your local stations while your testing your set. Never trust those vintage pushbutton assemblys! Those can completely "kill" any good radio under restoration! Wait till you get your set working fully in "manual-tuning" first, then you can go back & check your PB stations-presets assembly later!
Just tryin to help! Best of luck with your vintage Philco!!
To bypass this potential-prob, is by following your schematic closely to where the points of "manual-tuning" engages in the old Pushbutton assy, then using a jumper-wire with a alligator-clip on each end, to bypass the switch assy altogether. Make sure your getting good contact for "manual-tuning" only, ( according to your schematic),then once you get your set working properly, you can go back and check your P/B switches later, and those small coils (small screws) will need to be tuned one at a time using a RF gen, or by ear, across the band, one at a time in khz steps corresponding to each coil(s), for your local stations broadcast khz (s).
Once you completely by-pass your pre-set buttons, and make sure your tuning your receiver by hand, turning the variable condenser, you will know you have the set ready to receive stations, once other probs are corrected first.
I would still suspect any corroded tube-pins on any of your local-type base tubes for bad recept!, since you already carefully recapped your set. Also, make sure your antenna is working properly, no shorts, & if need be for test, use a pc of wire approx 5'-10' long, to bypass your orig antenna, to the chassis' main antenna terminal, to receive your local stations while your testing your set. Never trust those vintage pushbutton assemblys! Those can completely "kill" any good radio under restoration! Wait till you get your set working fully in "manual-tuning" first, then you can go back & check your PB stations-presets assembly later!
Just tryin to help! Best of luck with your vintage Philco!!
