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Philco 70 tuning backward?
#10

(10-09-2016, 09:12 PM)morzh Wrote:  Bill

Again. You need to align tbe radio. I don't see you having done it so far.
If your oscillator is working, as it seems, take the alignment procedure, align the radio.
Then we will know what you are seeing and why.

Morzh , I did'nt go into detail but I did align it . Using a vintage Eico and also a modern signal generator .Both agree reasonably. The 260 kHz is alignable but I sense as you alluded 
I might not be getting it right. The digital model turns down better and is more controllable output level wise.But this part of the alignment is too easily overdriven (loud) compared to the other radios I have rebuilt and align .Then the lo end 600 of the dial does not come through loud on the next part of the alignment .So you are correct .I am not sure if I am getting it wrong and that is creating my problem. But even though I am not an expert I have done a few alignments and usually they are easier than this. That  usually says something is wrong .So set up at first detector grid with dial at 55 input 260 kc remove grid clip that is what I did . If anything i got a strong loud outcome.But not what I would call normal . To strong if anything! Is it possible the oscillator is not even running while I did  this?It could be me still.I believe simply that I do not know yet.   1400 aligns ok but with suspect tones down dial 600 Is very weak.Crank up the signal generator just to hear it. So I did algin it but maybe not correctly.Then again it does not want to be cooperative. I think that all the values xc xl r have to be correct for the oscillator circuit to resonate over the full range . Will go back at it again and try .Ordered prints from Chuck .Normally this thing would be done by now! Thanks!!! 
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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