10-24-2023, 08:11 PM
Hi and welcome to the Phorum,
In general terms most prewar receivers have a high impedance input for the antenna if it's the bc,sw, or fm band. Coax wasn't used much in the public sector till after the war. Typically your looking at something between 300-600 ohms for the input impedance.
If you were using a dipole antenna 300 ohm twin lead would be a good choice or 450 ohm ladder line. I don't know of any diagrams of the 45-1361 but there is a diagram for the three pin antenna coupler used in the 1940-42 sets.
As for weak and distortion. Check all the tubes especially the XXL's. Measure all carbon resistors to check their 20% tolerance against their marked value. Replace all foil/paper caps. Do a complete alignment and then you'll be in a good position to do the trouble shooting without guessing what small parts are bad.
GL
In general terms most prewar receivers have a high impedance input for the antenna if it's the bc,sw, or fm band. Coax wasn't used much in the public sector till after the war. Typically your looking at something between 300-600 ohms for the input impedance.
If you were using a dipole antenna 300 ohm twin lead would be a good choice or 450 ohm ladder line. I don't know of any diagrams of the 45-1361 but there is a diagram for the three pin antenna coupler used in the 1940-42 sets.
As for weak and distortion. Check all the tubes especially the XXL's. Measure all carbon resistors to check their 20% tolerance against their marked value. Replace all foil/paper caps. Do a complete alignment and then you'll be in a good position to do the trouble shooting without guessing what small parts are bad.
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!
Terry
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