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Wattage on a Silvertone 7036 resistor?
#5

(08-29-2015, 10:56 AM)ccomer1955 Wrote:  No, the flex ohm is the 400 ohm one next to it on the schematic. The flexohm still works, so I'm leaving it. I can't find the parts list in my high-res Rider's volumes, either.

At this point, I'd rather get there mathematically, so I can be sure I get it right on future rebuilds. This radio was never a great set to begin with, but whoever repaired it in the 40s or 50s took some liberties and was fairly sloppy at soldering. I'm just trying to put it back to the way the schematic says it should be. It has a replacement transformer that shows about what you'd expect for resistance on the primary and the secondaries, but I haven't put any power on it, yet.

It was a $5 radio for me, so I'm using it as a learning experience. It reminds me of a cheap Air King I worked on. It has a round cardboard tube on the side with the loop antenna glued to it. The cabinet is going to be fun, too. It's missing a piece of trim across the grille cloth, and part of the cabinet between the dial and the push buttons is broken off and gone, so I'm going to try to fabricate both parts. I'm sure it will cost me more than I would ever make on it, but I'm learning about some octal tubes and having fun.

 That kind of fits in with my experience then, is the 1500 ohm resistor was calculated at just above 1 Watt then the 400 Ohm resistor ahead of it would have been just a little bit more, so more then likely the 400 Ohm flexable resistor was probably a 2 or 3 Watt job. I would go to maybe 2 or 3 Watts for the replacement 1500 Ohm job, or up to 5 if space will allow.
  I take it that this Silvertone has a Bakelite or a Plascon cabinet? If this is the case then it need not be too expensive to repair, plastic auto body filler or fiberglass resins are fairly economical and will do a decent repair job if you do not mind a painted cabinet afterward. You could probably go into making molds and using epoxy and dyes to replicate the original material, but it probably isn't worth it unless it's a rare or valuable set. Sometimes it the set is common enough you can find an empty cabinet as a replacement. If it's a wooden cabinet it can be even easier, if you know what you are doing, repair on those can be made almost invisible.
Regards
Arran


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RE: Wattage on a Silvertone 7036 resistor? - by Arran - 08-30-2015, 12:15 AM



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