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Neutralization of a Philco 87
#9

Let me reset the timetable. I recapped the radio. When I first fired it up after the recap I could only receive the stations at 1440 and 1490. That’s when I rewound three of the RF coils  following the instructions in The Philco Repair Bench.  After I rewound them was when the radio worked very well everywhere except it worked too well at the 1440-1490 end. By too well I mean that with the volume turned all the way down the volume is too loud. It is motorboating so I guess isn’t really working well. 
I’ve checked the tubes, but I’ll check them again.
I used the procedure from the Philco Library to align and neutralize the set. I used a transition socket and the tube for each stage and a plastic wrench. 
I also swapped trimmer 4 and 5 as shown on the Philco procedure with no difference in the outcome.
One other thing. The grid leak resistor should be 750k ohms but is 880k ohms. Could this be a problem?


Messages In This Thread
Neutralization of a Philco 87 - by Kirbyc - 10-27-2019, 05:11 PM
RE: Neutralization of a Philco 87 - by morzh - 10-27-2019, 08:33 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 10-28-2019, 01:38 PM
RE: Neutralization of a Philco 87 - by morzh - 10-29-2019, 08:41 AM
RE: Neutralization of a Philco 87 - by Kirbyc - 10-29-2019, 01:00 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 10-29-2019, 01:15 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 11-05-2019, 03:53 PM
RE: Neutralization of a Philco 87 - by morzh - 11-05-2019, 04:33 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 11-06-2019, 12:04 AM
RE: Neutralization of a Philco 87 - by morzh - 11-06-2019, 10:08 AM
RE: Neutralization of a Philco 87 - by Kirbyc - 11-06-2019, 04:43 PM
RE: Neutralization of a Philco 87 - by morzh - 11-06-2019, 05:04 PM



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