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I keep hearing about the use of wirewounds in the plate and cathode circuits, however, most plate resistors are 100K or larger and finding ww in that size seems to be tricky, especially in the 1-2 watt range. Does anyone have a source for these types of ww and is it important for them to be non-inductive? I have seen recently some ww on Mouser that are 5 watt (not monkey coffins) at around $5 each but they are not noted as non-inductive (RS005100K0FB12)
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are better than carbon films, in other words, if I can't get, or fit, a non-inductive ww, would using an inductive, such as the silicone-coated 3 watters from mouser, be better than using a carbon film, which would be my next choice. thanks!
The 12 watt mills can be had up to 100K. Most tubes that use high resistance are running very low currents, like 12AX7's. Aside from suggesting avoiding such tubes:).....just use a decent metal or carbon film resistor. I wouldn't use metal oxides for audio myself.
Mills does make 5 watt resistors and they can do for cathodes. Ohmite makes good ones as well as huntington. A good wire wound resistor is one of the best possible choices. You do want non-inductive for tube loads.
thanks, Russ, it was a post by you about resistors that had me looking into the wirewounds. So the Mills, where do I get them from? thanks!
IIRC, you can get a few values of Huntington/Mills NIWW resistors from DigiKey. AA sponsor Micheal Percy stocks a pretty extensive set of values.
Eli D.
FWIW, Mills is Huntington. ;> )
Eli D.
Sure hope the quality stays intact.
And now they are both Vishay.
The MRA series are available from Digi-Key and Mouser. You have to search "MRA" though as DK is putting them under Dale. The datasheet specifically says Vishay Mills though.
Dan Santoni
Think for most apps, metal-oxide or carbon comp anode loading resistors will be fine.
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