11-29-2018, 02:28 PM
Hi Bill and welcome!
I probably would not be too concerned abt the distortion but would but looking at the amplitude of the oscillator output. Does it drop off significantly from one end of the band to the other?? If so I have a look at the osc coil and rewind the feedback winding. I've had some that weren't open but were flaky.
Back in the days when is old guy was built an o scope was bleeding edge technology much less than one that have good response up to a mc. Point is there is no data on the distortion and such via Philco. As for the harmonics some of these sets use the second harmonic to give SW coverage w/o tapping the coil (don't necessarily mean the 60 but the model 81 comes to mind).
GL
I probably would not be too concerned abt the distortion but would but looking at the amplitude of the oscillator output. Does it drop off significantly from one end of the band to the other?? If so I have a look at the osc coil and rewind the feedback winding. I've had some that weren't open but were flaky.
Back in the days when is old guy was built an o scope was bleeding edge technology much less than one that have good response up to a mc. Point is there is no data on the distortion and such via Philco. As for the harmonics some of these sets use the second harmonic to give SW coverage w/o tapping the coil (don't necessarily mean the 60 but the model 81 comes to mind).
GL
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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