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In Reply to: RE: Love these 10 turn pots! posted by zekk on August 13, 2015 at 16:20:30
Here's a link to some 100 ohms 10 turn pots.
The pot will draw 75ma. of filament current so be sure the supply can handle it.
The larger value pot will draw less filament current but leave you with more un-bypassed cathode resistance. (that will cause some local current feedback that you might not want)
On a 2a3 (2.5 volts filament) I would use a 50 ohm pot. Because the voltage is lower the 50 ohm pot only draws 50ma.
I use 100 ohms on my 300b. 5 volts across 100 ohms is 50ma.
A 100 ohm pot adjusted to the middle gives 25 ohms of un-bypassed cathode resistance.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Have you used the pots linked? I've had quality issues with some China made pots and attenuators from ebay.
.
Freak out...Far out...In out....
I agree, it's hard to find a real Bourns pot on eBay.
Infamous sockpuppet
Then get them from Mouser.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Yes, next time I will.
Infamous sockpuppet
I have a couple of these ordered. I'll let everyone know how they turn out. Should be here in a few days.
I wonder what wattage those are? I can't see anywhere that the listing says.
Cal
2 watt
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Yeah, what he said. : )
Edits: 08/14/15
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