05-13-2020, 08:12 PM
https://philcoradio.com/library/download...-final.pdf Seems pretty clear to me. NA is awful!!
Don't really care about what the Sam's sez values or placement. It just confuses things. The resistor a cap you mention are in the cathode circuit of the oscillator. They vary the gain of the oscillator tube. They are not a frequency determining components.
I'm thinking they something wrong w/the IF alignment. You shouldn't have to bottom out the slugs. A few things to check. Frequency with a counter @455kc. With the generator set up at 455kc and connect up. Move the dial on the Philco and if the signal disappears you were not on the IF frequency. Always when doing an alignment keep the generator level to a minimum. This means so you can just barely hear it then peak up the adjustment. turn the generator down till you get all of the 455kc transformers peaked up. I usually go over them a couple of times to be sure. Having the generator level up can cause the avc to lower the gain of the tubes in the avc line.
Don't really care about what the Sam's sez values or placement. It just confuses things. The resistor a cap you mention are in the cathode circuit of the oscillator. They vary the gain of the oscillator tube. They are not a frequency determining components.
I'm thinking they something wrong w/the IF alignment. You shouldn't have to bottom out the slugs. A few things to check. Frequency with a counter @455kc. With the generator set up at 455kc and connect up. Move the dial on the Philco and if the signal disappears you were not on the IF frequency. Always when doing an alignment keep the generator level to a minimum. This means so you can just barely hear it then peak up the adjustment. turn the generator down till you get all of the 455kc transformers peaked up. I usually go over them a couple of times to be sure. Having the generator level up can cause the avc to lower the gain of the tubes in the avc line.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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