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In Reply to: RE: What happened to all the parts?? posted by vinnie2 on January 27, 2016 at 11:47:48
I also agree with Dr. on paralleling two 12W Mills. If that seems marginal, you could parallel 3 or 4 of them to get the needed power handling and R value.. Even 4 might take up less space than a Caddock power resistor plus heat sink.
Follow Ups:
If I understand what vinnie is doing with them, one would likely be enough - relatively low voltage and current.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
You are probably right, and they might be worth giving a try. I keep forgetting these are not carrying a ton of current.
Especially for a cathode resistor which is typically of low-ish value.
Most cathode resistors I have used in the past have been for power tubes and I was using 25W or more. I guess it just got to be a habit.
Understood vinnie. Just be aware, neither the 45 or 26 you are running have a lot of cathode V to drop and current is small. The 45 will be the most demanding. As you know, to calc the power (wattage) dissipated:P = I x V (current traveling through the resistor x voltage dropped across the resistor, i.e. cathode voltage)
= 0.0342 x 41 (going by your preferred operating point and assuming you are not direct coupling to the 45)
= 1.4 WattsYour cathode R will be dissipating 1.4W! Ideally, I over-rate my resistor Wattage by 5, but that is very conservative of me and I break this rule occasionally if I know the parts are reliable. Mills are reliable. 1.4W x 5 = 7W. Hence, a resistor with at least 7W dissipation will do it very comfortably. A 5W resistor would also be doing it easy, so long as ventilation is adequate. A 12W Mills will be loafing.
For some context, my next build will use Mills 12W resistors to dissipate 5W in a moderately-well ventilated chassis. I am not worried.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Edits: 01/29/16
Do you still think the mills are the way to go after the posts about them being made in Mexico now and being a lower quality? I was all set to try some until I read those.
I'd try them.
I read someone's opinion saying the Mexico versions were higher quality; another's the opposite. No one is saying in what way, specifically.
More the point, I reckon the Mexico Mills are still a pretty decent product, versus the opposition.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
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