11-04-2020, 12:42 PM
Tell you what will call it a model 84 it's got standard base tubes tube like yours. The tap on the filament is there to help cut down on the hum from getting into the detector stage. Don't ground any of the filament or pilot lamp connections. I would increase the value of the filters to 10 or 20 mf ea and add 20 or 25 mf to the bias filter too. Because of the det and the amp it needs p/s to be really clean from hum.
https://philcoradio.com/library/download...l.%201.pdf
>The filter caps have been supplied with 10 MFD. One was damaged. would I be able to replaces them with 22 MFD caps instead without a problem?
Not a problem but would probably stick with 22mf as the highest. The spec on the 80 tube is 40mf max.
>The power supply schematic shows a center tap (5) that does not exist on the power supply (32-7180). Another center tap (8) exists that are connected together. Is it necessary?
It's just a different way to do the same thing. The tap may work a little better not sure. When I've built some regenerative sets I've added a diode and cap to apply dc voltage to filament of the detector stage. This works well but there is about a half volt drop across the diode 6.3 down to 5.8v.
>Is there an easy way to check the tubes (80, 42, 77) for condition?
Yeah tube test works good for me. Short of that no other than what Bob mentioned.
>Is there a place to obtain an inexpensive signal generator for alignment?
Bob comes to the rescue again!
Very common on these sets for the primary of the antenna and oscillator coils to be open. Pretty sure the info is over in the library to rewind. It's simple.
GL w/your project
https://philcoradio.com/library/download...l.%201.pdf
>The filter caps have been supplied with 10 MFD. One was damaged. would I be able to replaces them with 22 MFD caps instead without a problem?
Not a problem but would probably stick with 22mf as the highest. The spec on the 80 tube is 40mf max.
>The power supply schematic shows a center tap (5) that does not exist on the power supply (32-7180). Another center tap (8) exists that are connected together. Is it necessary?
It's just a different way to do the same thing. The tap may work a little better not sure. When I've built some regenerative sets I've added a diode and cap to apply dc voltage to filament of the detector stage. This works well but there is about a half volt drop across the diode 6.3 down to 5.8v.
>Is there an easy way to check the tubes (80, 42, 77) for condition?
Yeah tube test works good for me. Short of that no other than what Bob mentioned.
>Is there a place to obtain an inexpensive signal generator for alignment?
Bob comes to the rescue again!
Very common on these sets for the primary of the antenna and oscillator coils to be open. Pretty sure the info is over in the library to rewind. It's simple.
GL w/your project
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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