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Mills  MRA-5 resistors in tube circuits
Mills  MRA-5 resistors in tube circuits
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Old 22nd April 2010, 08:10 PM   #1
dodo is offline dodo  Poland
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Join Date: Dec 2004
Location: Bydgoszcz , small town in Poland
Default Mills MRA-5 resistors in tube circuits


Does someone used mills MRA-5 ww resistors as cathode resistors or high voltage resistors in psu with voltage range 200 - 350 V ?

I'm asking because there is difference in voltage range showed in the the data sheet of the MRA - 5 - 400 V max and the voltage range showed in Percy catalog 200 V :

"* MRA-5 (5watt) non-inductively wound, very compact size for its power rating, copper leads
200V Maximum, 1% tolerance, 50ppm TCR <10Ω, 20ppm >10Ω, .167" Diameter x .650" Long

Thank you in advance for the feedback
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Old 23rd April 2010, 12:15 AM   #2
Eli Duttman is offline Eli Duttman  United States
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Join Date: Apr 2004
Location: Monroe Township, NJ
P = V2R The largest MRA-5 value Percy shows is 20,000 Ω. Applying the formula yields 316 V. Given that bit of arithmetic, I'd say Percy is correct in 200 V. max. for MRA-5s and 400 V. max. for MRA-12s.
Eli D.
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