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Is there any issues of using one or the other that i should be aware of. It occurred to me that whenever you use a wire wound resistor there could be an induced magnetic field that may be a problem. So, in my case i would be using these pots for bias setting voltages less than 80vdc .thank you for your comments. best regards, Dak
Follow Ups:
Hi, FL, i found some nice Japan made carbon element pots from a USA seller that i had bought from before so i decided to get those. cheers, Dak
I wouldn't think inductance would be an issue in a DC circuit such as a bias adjust.
That being said, I don't usually see any wirewound pots in the high Ohm values needed for a bias circuit. They are usually 1000 Ohms or less, and also they have higher wattage ratings than a bias pot requires.
Hi Al, here is an ad on eboy for some high value ww pots.
http://www.ebay.com/itm/110938041394
I was considering trying some for my project. cheers, Dak
Those look pretty good. Ten turns would be a bit of an inconvenience, though, unless you incorporate some kind of dial with a turns counter.
Yeah, i was wondering about that. I never used one of those type of multiturn precision pots. And actually, i decided against that one and stick with the 2w carbon element pot. Cheers, Dak
Think this will work fine. As one really shouldn't be tweaking the bias pot that much. A few times, during new tube break-in. Then, whenever you change tubes.
High quality wire-wounds I'd trust, look at Bournes 3543, 3445 and 3547.
Jeff Medwin
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