I'm in big need for this 5-step potentiometer for the restauration of my SX-1250.
Good price given
Thanks in advance
Good price given
Thanks in advance
What is wrong with it? Any way to repair? Those are like hens teeth these days and folks who have them know it. As was said on AK we wonder if there is a way to reproduce it since it is a switched based pot, not a regular pot with a wiper and carbon or cermit track.
Really?
Where did you get that information.
Because the Service Manuals on that model that I have, and also having serviced that model, all have the usual standard potentiometers for tone controls.
Those AK gentlemen are incorrect as far as I can see.
A link to page 49 of the Pioneer SX-1250 Service Manual. Both the Bass-50 Hz and the Treble-20 kHz are indicated as being 5-step 102K variable resistors.
Page 49 Pioneer SX-1250 Service Manual
Okay a broken shaft it be, I thought that I read in a few posts that some have managed to drill/ tap into the existing shaft and put on an extension or some have used aluminum epoxy as another method possible options. I have done neither so just throwing it out their as possibilities
Do you have the broken off end and knob?
Do you have the broken off end and knob?
I got the broken of piece and also thought about some glue for aluminium.... But have never tried it or have any knowledge about what kind of glue could do the trick....
J-B weld two part epoxy was the one I recall them calling out. I am not sure if the linked product is what was used or if it would do the job sufficiently. Might be worth a try.
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Have a machinist friend? You can drill and tap the original shaft to fit a hex standoff (would use M2.5). A dab of an anaerobic cement will secure the screw permanently. The one shown here has a 4mm "hex", but you can purchase them with 6mm diameter "hex"
Edit: the M3 hex standoffs are available with 6mm hex, but the M2.5 are not. I use McMaster here in the states: https://www.mcmaster.com/metric-standoffs/male-female-threaded-hex-standoffs-6/thread-size~m3/
Edit: the M3 hex standoffs are available with 6mm hex, but the M2.5 are not. I use McMaster here in the states: https://www.mcmaster.com/metric-standoffs/male-female-threaded-hex-standoffs-6/thread-size~m3/
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You may have to put an alps in there and forget the 5 step and possible cut out at flat setting.
This is a removal of the resistive coating at flat to take the pot out of the circuit.
If you can take apart the old pot and replace the carbon and or shaft wuth bearing that may work.
This is a removal of the resistive coating at flat to take the pot out of the circuit.
If you can take apart the old pot and replace the carbon and or shaft wuth bearing that may work.
Gentleman......to quell your speculations...
"Stepped" controls, in this case "stepped variable potentiometer" means that they are just a regular pot with a built-in DETENT mechanism arrangement, NOT some sort of "switched resistance" as you seem to believe.
I've BEEN in them already doing restorations for customers, and yes, charging Big Money to do the job as well.
The last SX-1250 I did back in 2014 cost the customer $1060.00 in parts and labor.
Take a look at the actual SCHEMATIC of the controls.
Nope, sorry.
The control has 2 Steps on EITHER SIDE of the center setting 5-2.5-0-2.5-5 and is a special limited rotation pot with detents.
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An accurately aligned drill of 2 or 3 MM and several MM deep into both the shaft and its mating piece, then a steel rod inserted with J-B Weld and it's good as new.
Of course the whole pot would need to be removed first.
Not to be rude or cruel, but this may be a good time to get a better receiver. Those old (now) SX Pioneers alway sounded harsh.
If you go this way, only use the steel version. The aluminum ones break off easily.