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Philco 80 jr. rectifier tube hot
Steve Davis
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Posts: 1,412
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#25

10-04-2016, 11:20 PM
Mike, when you make a "dog bone" resistor by placing a modern resistor in a plastic tube, do you pot the resistor in epoxy? I have made several "dog bones" and I use JB Quick or Locktite Weld to pot the resistors. The idea being, the epoxy will transfer the heat to the outer surface to be dissipated.

Here are some pictures of a 13K, 3 watt dog bone that I made. I used six 2.2K, 1 watt resistors arranged in a saw tooth fashion to evenly distribute the heat (I always use 2X the wattage rating for all my dog bones).



 [Image: http://i985.photobucket.com/albums/ae335...7_0792.jpg]


[Image: http://i985.photobucket.com/albums/ae335...7_0795.jpg]


[Image: http://i985.photobucket.com/albums/ae335...7_0796.jpg]


Steve
M R Radios   C M Tubes
(This post was last modified: 10-04-2016, 11:23 PM by Steve Davis.)
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Messages In This Thread
Philco 80 jr. rectifier tube hot - by Mike L - 08-28-2016, 04:29 PM
RE: Philco 80 jr. rectifier tube hot - by sam - 08-28-2016, 05:08 PM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 08-30-2016, 08:20 PM
RE: Philco 80 jr. rectifier tube hot - by Arran - 09-02-2016, 04:50 AM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-03-2016, 10:31 AM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-04-2016, 09:28 AM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-11-2016, 03:06 PM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-12-2016, 07:47 PM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-13-2016, 08:25 PM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-22-2016, 07:45 PM
RE: Philco 80 jr. rectifier tube hot - by morzh - 09-22-2016, 10:06 PM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 09-24-2016, 09:20 AM
RE: Philco 80 jr. rectifier tube hot - by Steve Davis - 10-04-2016, 11:20 PM
RE: Philco 80 jr. rectifier tube hot - by morzh - 10-05-2016, 07:59 AM
RE: Philco 80 jr. rectifier tube hot - by Mike L - 10-05-2016, 07:28 PM



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