Quote:
Originally Posted by radio nut
Ok, I am not familar with the term hot(tube). I know which one is the damper though. Also, what are the getter spots?I have been working with tubes and old radios for a few years now but I have not heard of getter spots before
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HOT--Horizontal Output Tube.
Getter spots are those silvery lustrous spots found on most tubes that look as if silver paint were sprayed inside the glass. They can be a handy "telltale" in initial assessment of tube condition. If you look at a fresh tube these spots--usually visible on the top or perhaps two diametrically opposite each other on the sides, or sometimes in all 3 places--will show as a nice mirror finish, and fade without discoloration at the edges to clear glass. As tubes age in service these spots will either fade or whiten slightly at the edge, or develop a rainbow pattern at the edge. When the tubes are just about clapped out these spots can deteriorate into dull brown smudges. With gassy tubes they may turn ashen, and snow-white getter spots mean the tube has lost its vacuum entirely.