Help Needed- Replacement Volume Pot For a Fisher KX100

fsjonsey · 13th February 2008, 03:35 AM

I've been working to rebuild this fisher KX100 that I purchased off of ebay last fall. So far I've replaced all of the older signal caps with new orange drops, upgraded the coupling caps with Russian PIO's, rebuilt the ceramic "Printed Circuit" RIAA networks and tone circuits with ones I built with discrete components, and replaced the rectifier diodes with HEXFREDS, but now I've run into a snag. The unobtanium 500K stereo volume pot/power switch combination is shot, and tracking worse the more I use it. The left channel is extremely faint, and does not track evenly with the right, suddenly becoming louder than the right when turned past 12 o'clock. This channel imbalance makes it impossible to use the phono preamp due to having to turn the right channel up to the point of feedback. Has anyone else here had a similar issue with a fisher volume pot and found any way to rebuild it, or know of a currently produced pot that would have the correct shaft to fit the original fisher knob? Having a power switch is not an issue, as i can install one somewhere else on the chassis. Any help would be greatly appreciated.

SpreadSpectrum · 13th February 2008, 04:50 AM

You might be able to get Mouser P/N 313-1240F-500K to work. Is it a .25 inch D shaft on the Fisher knob? I think my X-101-B is.

SpreadSpectrum · 13th February 2008, 04:52 AM

Its got kind of a low power rating. Not that you would be putting much power into it, but you might want to get your calculator out just to be sure it will work.

fsjonsey · 13th February 2008, 05:04 AM

Quote:

Originally posted by SpreadSpectrum
You might be able to get Mouser P/N 313-1240F-500K to work. Is it a .25 inch D shaft on the Fisher knob? I think my X-101-B is.

It's a D shaft. That should work. In the future, would it be possible to rebuild the original pot?

SpreadSpectrum · 13th February 2008, 05:12 AM

I've always wondered the same thing as I have an old Fisher as well. Some of the pots are quite unique like the bass and treble pots with concentric knobs for individual adjustments of channels. I've never seen anything like it new.

My guess is that it would be pretty expensive if it were possible, but I've never heard of anyone who does that.

Maybe some of the old timers here know of something.

fsjonsey · 13th February 2008, 06:03 AM

Quote:

Originally posted by SpreadSpectrum
I've always wondered the same thing as I have an old Fisher as well. Some of the pots are quite unique like the bass and treble pots with concentric knobs for individual adjustments of channels. I've never seen anything like it new.

My guess is that it would be pretty expensive if it were possible, but I've never heard of anyone who does that.

Maybe some of the old timers here know of something.

The only thing i could think of is cannibalizing pots with similar wipers and contacts, and using them to rebuild it.

13th February 2008, 03:35 AM	#1
fsjonsey diyAudio Member Join Date: Sep 2007	Help Needed- Replacement Volume Pot For a Fisher KX100 I've been working to rebuild this fisher KX100 that I purchased off of ebay last fall. So far I've replaced all of the older signal caps with new orange drops, upgraded the coupling caps with Russian PIO's, rebuilt the ceramic "Printed Circuit" RIAA networks and tone circuits with ones I built with discrete components, and replaced the rectifier diodes with HEXFREDS, but now I've run into a snag. The unobtanium 500K stereo volume pot/power switch combination is shot, and tracking worse the more I use it. The left channel is extremely faint, and does not track evenly with the right, suddenly becoming louder than the right when turned past 12 o'clock. This channel imbalance makes it impossible to use the phono preamp due to having to turn the right channel up to the point of feedback. Has anyone else here had a similar issue with a fisher volume pot and found any way to rebuild it, or know of a currently produced pot that would have the correct shaft to fit the original fisher knob? Having a power switch is not an issue, as i can install one somewhere else on the chassis. Any help would be greatly appreciated. __________________ Born in the wrong decade.

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13th February 2008, 04:50 AM	#2
SpreadSpectrum diyAudio Member Join Date: Nov 2007	You might be able to get Mouser P/N 313-1240F-500K to work. Is it a .25 inch D shaft on the Fisher knob? I think my X-101-B is.

13th February 2008, 04:52 AM	#3
SpreadSpectrum diyAudio Member Join Date: Nov 2007	Its got kind of a low power rating. Not that you would be putting much power into it, but you might want to get your calculator out just to be sure it will work.

13th February 2008, 05:12 AM	#5
SpreadSpectrum diyAudio Member Join Date: Nov 2007	I've always wondered the same thing as I have an old Fisher as well. Some of the pots are quite unique like the bass and treble pots with concentric knobs for individual adjustments of channels. I've never seen anything like it new. My guess is that it would be pretty expensive if it were possible, but I've never heard of anyone who does that. Maybe some of the old timers here know of something.

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