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Philco 40-201 Restoration Journal
#19

Congrats on getting your 40-201 working again! Back-tracking for previous mistakes works sometimes! If I remember correctly, the 40-201 models had a dial-drive string tuning system, with printed dialscale? Your set may not need major alignment. Overall alignment seems close as per your last post. Always remember that printed dialscales were never 100% spot-on for tuning accuracy at all due to printing errors , and some shrink overall length with age! Sometimes, the dial needle that attaches to the dial-string gets moved abit to one side or the other ( L or R) abit while servicing. You can check the "travel" of your dial-pointer by tuning your set all the way down to where it stops at 550 kc low end the AM band. Slide the dial-pointer into position over the 550 kc mark, while using your RF Gen set at lowest- audible output signal into your radio with good exact 550 kc signal injected thru radios antenna connector. Squeeze the dial-pointer tightly to dial drive cable with needlenose pliers once your set on 550 kc with printed dialscale marking. The dial drive system should then track across dial ( fairly close) to the printed dialscale up to the highend of the AM band. If your set is 455 kc IF on AM broadcast band , make sure you "peak-up" both 455 kc IF cans to max volume, by " very-slowly" adjusting the 2 small screws in each 455 kc IF can(s) one at a time, then, go back over all them once again, till max volume by ear test while tuned to a local AM station. Once you assertain that your dial-drive pointer is tracking along properly, if necessary, you can follow schematics specified alignment instructions to slightly "shift" and adjust your radios "oscillator(s)" adjustments slowly up & down by again using your RF Gen, or a station known good freq such as WWV on SW bands, and one or more of your local AM stations to adj the broadcast & SW bands oscillator(s) adjustments if needed, also by ear. If you have to adjust the oscillators, go very,very,slow in turning those adj screws, or you can really throw the receiver way out of alignment very fast! Id venture to bet your set doesnt need much oscillator adjustment alignment at all if any, and a close look into your dial drive pointer,dial drive string "travel",.. & printed dial scale placement instead, which is all "mechanical" only adjustments, will yield best results in your case. Best of luck, and enjoy your vintage Philco!! Icon_wink ol Tex


Messages In This Thread
Philco 40-201 Restoration Journal - by g8wayg8r - 05-14-2009, 12:41 AM
Re: Philco 40-201 Restoration Journal - by Texasrocker - 05-30-2009, 12:37 AM



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