12-30-2016, 02:02 AM
Hi and welcome to the Phorum,
<There is a shadow meter on this unit, is there anything special I need to do to make sure this works?
Well you can test the coil by measuring it's resistance w/o the parallel resistor connected Should see about 1k or so if it measures much higher then it's time to rewind it. But like Mike said you don't need to bother w/it till later in the rebuild.
<There is a part called a "wave trap" that looks like it has clear epoxy on it, What is a wave trap? Is the clear stuff normal?
It's designed to trap waves! It is connected in series w/the ant and is adjust to block out signals that are at the IF frequency from being received from the ant. Back in the '30s and 40's there were lot of long wave stations these could cause interference w/broadcast listening if one was transmitting a the same frequency as your IF.
<Lastly, what do I need to look out for on this particular chassis? Is there anything in particular I need to watch for?
Lots of things but it may be easier to take them as come along.
For starters unplug the spkr and measure the resistance across all of the 4 pins. All should have some resistance between them like 2000 ohms or less. If not you may have a bad field coil or output transformer.
In the power supply the 10mfd cap inside #73 + side is connected the chassis (doesn't have to have a HV cap there this there is only about 35v there, would use a 50v). The other two filter caps the - connect to the HV ct.
http://www.nostalgiaair.org/pagesbymodel...013125.pdf
GL
<There is a shadow meter on this unit, is there anything special I need to do to make sure this works?
Well you can test the coil by measuring it's resistance w/o the parallel resistor connected Should see about 1k or so if it measures much higher then it's time to rewind it. But like Mike said you don't need to bother w/it till later in the rebuild.
<There is a part called a "wave trap" that looks like it has clear epoxy on it, What is a wave trap? Is the clear stuff normal?
It's designed to trap waves! It is connected in series w/the ant and is adjust to block out signals that are at the IF frequency from being received from the ant. Back in the '30s and 40's there were lot of long wave stations these could cause interference w/broadcast listening if one was transmitting a the same frequency as your IF.
<Lastly, what do I need to look out for on this particular chassis? Is there anything in particular I need to watch for?
Lots of things but it may be easier to take them as come along.
For starters unplug the spkr and measure the resistance across all of the 4 pins. All should have some resistance between them like 2000 ohms or less. If not you may have a bad field coil or output transformer.
In the power supply the 10mfd cap inside #73 + side is connected the chassis (doesn't have to have a HV cap there this there is only about 35v there, would use a 50v). The other two filter caps the - connect to the HV ct.
http://www.nostalgiaair.org/pagesbymodel...013125.pdf
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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