08-28-2016, 06:51 PM
Hi Mike,
Have never measured the bulb temp of an 8o tube. 140 deg seem reasonable as it's very uncomfortable to touch. With that said a few things to check. Measure the DC voltage from the 80 filament to chassis ground. Should see about 250vdc. If it's below 200v or so something is a miss. If there is a short somewhere in the HV the plates in the 80 will start to glow RED, turn it off and find the problem. Be aware that #37 has the + side connected to the chassis and - the the WW resistor.
For other service notes search the site for model 80 and 84, both are similar and share the same issues.
Would go ahead and replace all of the wax/paper caps, electrolytics (there's 3) and check the values of all the carbon resistors. I've serviced a bunch of these sets and most of the resistor are way off in value.
http://www.nostalgiaair.org/pagesbymodel...013843.pdf
Welcome to the Phorum!
Terry
Have never measured the bulb temp of an 8o tube. 140 deg seem reasonable as it's very uncomfortable to touch. With that said a few things to check. Measure the DC voltage from the 80 filament to chassis ground. Should see about 250vdc. If it's below 200v or so something is a miss. If there is a short somewhere in the HV the plates in the 80 will start to glow RED, turn it off and find the problem. Be aware that #37 has the + side connected to the chassis and - the the WW resistor.
For other service notes search the site for model 80 and 84, both are similar and share the same issues.
Would go ahead and replace all of the wax/paper caps, electrolytics (there's 3) and check the values of all the carbon resistors. I've serviced a bunch of these sets and most of the resistor are way off in value.
http://www.nostalgiaair.org/pagesbymodel...013843.pdf
Welcome to the Phorum!
Terry
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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