Mills MRA-5 resistors in tube circuits

dodo · 22nd April 2010, 08:10 PM

Hi

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

Eli Duttman · 23rd April 2010, 12:15 AM

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.

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

23rd April 2010, 12:15 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, 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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