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In Reply to: RE: Resistor dissipation Question posted by timp on September 15, 2012 at 21:01:47
Gees!
You guys are absolutely right! To ensure 50w rating i need to have a heat sink size of 12" × 12" × 0.125" thick aluminum panel (294 sq. in. surface area). I need to add a kitchen sink into my psu!
That's crazy!
Follow Ups:
Relax,As far as what T_K mentioned on voltage rating, well, you are only dropping 45 VDC across the resistor, so its not a concern.
I would use the 50 Watt resistor bolted to your existing chassis, because you do NOT need to dissipate 50 Watts, only 8.1 Watts continuous.
Also, you can use the chassis to keep your Chipotle Burrito warm. Yumm.
Another alternative, use two 500 Ohm 13 Watt power resistors in parallel, to become 250 Ohms at 26 Watts rated. I sonically prefer Mills MRA-12s, twelve watters, but if in series to the Output tubes, I always prefer near zero or minimum resistances !!.
Jeff Medwin
Edits: 09/15/12 09/15/12 09/15/12
"you are only dropping 45 VDC across the resistor, so its not a concern."
Except that the OP said the resistor has more than 400V on it. Looks like it's safe though; the datasheet says the RH050 has a 2,000 Vrms dielectric strength. Given that it's only dissipating 8W, your idea of bolting it to the chassis seems like a good solution.
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