In Reply to: Resistor dissipation Question posted by timp on September 15, 2012 at 20:26:39:
If the Dale is enclosed in an aluminum casing, with two tabs on each end that allow you to mount it, and has some cooling fins, it is ONLY rated 50 Watts when properly heat sinked to a chassis or sufficient material to "sink" the excess heat into. Without the proper mounting, it is no wheres near 50 Watts rated. Most likely it is 20 Watts maximum when not heat sinked.There is a white paste you use, (thermal grease or heatsink compound are common names), applied between the resistor and the chassis contact area, to more easily transfer heat from the device to the heat sink area.
Often, the type resistor I describe is called a "chassis mount" power resistor.
If this resistor is reducing B+ to the output tubes, there are far better ways to accomplish this, but that is another story for another day!
Jeff Medwin
Edits: 09/15/12 09/15/12
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Follow Ups
- RE: Resistor dissipation Question - drlowmu 20:49:07 09/15/12 (18)
- RE: Resistor dissipation Question - timp 20:58:19 09/15/12 (17)
- RE: Resistor dissipation Question - tube wrangler 07:58:22 09/16/12 (10)
- Would you mind... - wheezer 06:56:33 09/17/12 (9)
- RE: Would you mind... - tube wrangler 19:22:56 09/17/12 (8)
- RE: Would you mind... - raq 05:46:03 09/19/12 (0)
- RE: Would you mind... - wheezer 22:56:00 09/17/12 (0)
- RE: Would you mind... - timp 20:50:48 09/17/12 (5)
- RE: Would you mind... - mikeyb 06:05:52 09/18/12 (4)
- RE: Would you mind... - wheezer 08:44:05 09/18/12 (3)
- RE: Would you mind... - tube wrangler 20:48:51 09/18/12 (2)
- RE: Would you mind... - wheezer 05:27:42 09/19/12 (0)
- RE: Would you mind... - Triode_Kingdom 21:22:57 09/18/12 (0)
- RE: Resistor dissipation Question - drlowmu 21:08:11 09/15/12 (5)
- Just for the record... - Steve O 21:59:07 09/15/12 (3)
- RE: Just for the record... - raq 05:31:14 09/19/12 (0)
- Then you'll need a "good sleep factor"... - wheezer 04:45:47 09/16/12 (0)
- RE: Just for the record... - drlowmu 22:13:37 09/15/12 (0)
- RE: Resistor dissipation Question - timp 21:10:14 09/15/12 (0)