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Looking with a flashlight inside,I did find out it's a model 578. I was able to secure a schematic posted online. Looked online for other information. Sparse at best. Unfortunately some bad news as follows.... posted by someone who owned/owns? a Sparton 578 chairside: "Chairsides are pretty much a nightmare to extract the chassis. How did they expect people to do something as simple as changing a tube? " So it sounds like that normally simple procedure might be difficult on this. As far as chassis pix go I'll post them..... eventually.
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