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Philco 70 tuning backward?
#8

(10-08-2016, 09:29 AM)morzh Wrote:  Oscillator backwards (even if worked) has nothing to do with it, as no matter how it oscillates and for what reason, the tuning cap meshing will decrease the frequency and unmeshing will increase it.
You are likely badly out of alignment.
Plus might be seeing images.

Put the oscillator back as it originally was, make sure it does oscillate, and align the radio.

Morzh, I put the original mica back in.Fairly similar but cuts out around 900 instead of 850 .Still have backward stations the same and a 1230 station strong local at 950 on the dial. I did some of the test that Roslyn suggested looking at a scope putting in 260khz between coil #6 & 8 .Am740 came in at1000 and 950 at 1200 a little higher at 960 the strong local 1230 came in. If I park the tuning gang low at Say 740am and hook the signal generator to the antenna and ground I can dial in many stations by changing the freq .Also get harmonics so same station at different frequency. I do not think the micas are original They are areovox and a different shape as others.The coilor code is yellow orange but since I am not sure that relates to the .00042 of the original print .I am not sure they are wrong.So I am pretty certain this oscillator cuts out at 900 two different tubes . Going the chuck route if the 110_pf micas I have coming do not change things. I am not beyond waiting for another chassis on this one. But I also want to figure it out. I think this points to the oscillator and maytmaytbe more. Thanks again to both you And others who helped so far!!!
Bill


Messages In This Thread
Philco 70 tuning backward? - by btoher - 10-07-2016, 10:34 PM
RE: Philco 70 tuning backward? - by morzh - 10-08-2016, 09:29 AM
RE: Philco 70 tuning backward? - by btoher - 10-09-2016, 08:53 PM
RE: Philco 70 tuning backward? - by btoher - 10-08-2016, 10:02 AM
RE: Philco 70 tuning backward? - by morzh - 10-08-2016, 11:24 AM
RE: Philco 70 tuning backward? - by Radioroslyn - 10-08-2016, 11:48 AM
RE: Philco 70 tuning backward? - by sam - 10-08-2016, 12:42 PM
RE: Philco 70 tuning backward? - by btoher - 10-08-2016, 06:46 PM
RE: Philco 70 tuning backward? - by morzh - 10-09-2016, 09:12 PM
RE: Philco 70 tuning backward? - by btoher - 10-09-2016, 11:33 PM
RE: Philco 70 tuning backward? - by Radioroslyn - 10-10-2016, 12:53 AM
RE: Philco 70 tuning backward? - by btoher - 10-14-2016, 09:15 PM
RE: Philco 70 tuning backward? - by btoher - 10-16-2016, 12:24 PM
RE: Philco 70 tuning backward? - by Radioroslyn - 10-16-2016, 03:06 PM
RE: Philco 70 tuning backward? - by btoher - 10-17-2016, 07:34 PM
RE: Philco 70 tuning backward? - by Radioroslyn - 10-17-2016, 07:50 PM
RE: Philco 70 tuning backward? - by Steve Davis - 10-17-2016, 08:25 PM
RE: Philco 70 tuning backward? - by Radioroslyn - 10-17-2016, 09:28 PM
RE: Philco 70 tuning backward? - by btoher - 10-18-2016, 07:38 PM
RE: Philco 70 tuning backward? - by Steve Davis - 10-19-2016, 07:14 PM
RE: Philco 70 tuning backward? - by btoher - 10-23-2016, 04:28 PM



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