Looking for pot

  • Thread starter Thread starter Foamfoot
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Foamfoot

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Hey everyone. Sorry, I couldn't help myself with the title.

Does anyone know where I could find a dual gang potentiometer with different values. This is for my mixing board. Values are 10k (mic input) and 250k (line). Tried Mouser and digikey and didn't find anything like that.

Thanks for any help!!!
 
What make and model piece of gear is this for and what function?
 
If Mouser and Digikey didn't work out, check for bloodshot eyes behind your local head shop :D
 
It's a Carvin mx1688. The pot is for the input gain. There is a switch to select mic or line. Two channels were really acting up so I pulled the pots and the wafers are actually cracked/broken.
 
Here are the actual markings on the pot:
15 A 250K ohms + 05 C 10K ohm. (Fine Columbian--:-)


Thanks!!
 
Any way you can post a picture of it?

And are the pots linear or logarithmic, A or B? The pots will say line "10KLINA" or "250KLOGB" or something or other...

I'm asking all this because I have lots and lots of those kinds of parts here but I'd need to know some of those specifics to be sure.

Also, 'D' shaft or spline shaft?
 
Ugh...sorry...nothing with a 250kohm element with a spline shaft. :(
 
Well.....if I had to replace with something, would it hurt to maybe split the difference in ohm value or something? Like put a dual gang 100k or something? Taper?

I really appreciate you looking, Sweetbeats. Thanks.
 
Well,

Its like this...what I've got in a 2-gang spline shaft is 10k A taper and 5k B taper...you could add a 250k resistor to the 10k element and a 5k resistor to the 5k element and have your values pretty much there, but then I don't know if what you are replacing is linear or log taper (which aren't deal breakers if they don't match...I believe it just means that the gain rate will behave differently than the other pots), and whether the foot print is the same (assuming it is PCB mounted) and also whether the order if the elements is the same as yours (i.e. if the 250k and 10k elements in yours are in that order from top to bottom where the shaft is the top, or if they are the other way 'round...I suppose if they are the other way 'round then the 10k on mine matches the 10k on yours and then you still use a 250k resistor inline with the 5k element and you are even closer in values). Then there is shaft length.

See if you can get a picture up and get some more detail to see if we are close.
 
I guess I could, if worse comes to worse, switch some pots around and just put a 250k on two channels (say channel 15 and 16) and just use those for line inputs only. Would kinda suck but..............
 
I can try to post a pic, but won't be able to till tomorrow or day after. Thanks for the info.

When you add a resistor like that, is the taper still smooth or is it all at once. Hope I'm asking this right.
 
yu could get one of each (of the same make/design , and those that fit your board of course), like these for example:

Alpha 8mm dual guitar amp effect potentiometer 10k log | eBay
Alpha 8mm dual guitar amp effect potentiometer 250k log | eBay

then open up the pots and swap the resistive tracks. it's a pita procedure but duable, i've done this sort of things in the past when needed some "special" pots combos.
*********

looking at schematics, it does not look like you can get away with some sort of "combination" of resistors/pots to get the action right.
I guess you could install a dual 250K and add 10K resistor in paralel for the "MIC" gain pot, but this way you'll have the gain all the way up as soon as you turn the pot just a bit , so you'll have very little "turn room" to adjust mic gain there. It will be fine for LINE though ....

good luck puzzling :D
 
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