Broken Sony volume pot axle

[amplidude]

Hello.
I have this sony ta-f 530 es, my problem is that the axle on volume potentiometer is broken,
Part number is 1-237-472-11. Written on pot is . 7-472-12-120K X2
Anybody here have a solution ? Know where to buy such pot ?
And yes I have searched wide, the closest was a second hand pot from Russia, but specs were different.

 

[amplidude]

And a pic of the broken pot

The pot

 

[mjona]

The pot

The only suggestion I have is to dismantle this assembly and transplant a new shaft from a similar model potentiometer in place of the broken one.

 

[MAAC0]

If You can live without the loudness switch, a standard one will do.

 

[carlthess40]

If your good with a drill, you could drill and tap the center of the volume pot and install a bolt into it. A small one, and then use some small rubber hose and a rod to a volume knob onto it

 

[rayma]

If you disassemble the pot, you may find that you can replace the broken shaft more easily than it would seem.
Rod stock of the right diameter is easily available new, or even by scrapping another pot.

 

[wiseoldtech]

That's a bummer.
But messing around with that pot will only cause nasty language to permeate the room.

 

[amplidude]

Hi and thanks for your replies, I've thought about both drilling and a new shaft, but I tried turning the pot with signal and speaker, and left channel sounds lower and making slight hum as if a ground is broken, so I don't think it's a way to go.
This may sound stupid but how about drilling a 6mm hole in pcb and mount a new pot on some kind of metal support and axle through pcb, the centre appears to be in ground plane of pcb and no other traces pass through,

 

[Ian Finch]

You could mount a standard pot. in the existing location and you only need to add some leads to connect the top wafer at the 180° to the lower wafer leads. If it needs more rigidity in the mounting, it may be possible to incorporate some of the existing long connector links.

You'll need to lose the loudness adjustment and compensate for that change but loudness controls? I don't think anyone would miss them nowadays.

 

[carlthess40]

I may have a pot for you. Message me and I’ll see where it’s at and send you a pic and info

 

[amplidude]

I can live without loudness, good solution, takes some fiddling, but doable, what else are cold winter month good for, thx.

 

[amplidude]

I may have a pot for you. Message me and I’ll see where it’s at and send you a pic and info

PM sent, would be great to get the original part, because I really like the amp

 

[wiseoldtech]

You could mount a standard pot. in the existing location and you only need to add some leads to connect the top wafer at the 180° to the lower wafer leads. If it needs more rigidity in the mounting, it may be possible to incorporate some of the existing long connector links.

You'll need to lose the loudness adjustment and compensate for that change but loudness controls? I don't think anyone would miss them nowadays.

On the contrary, having a loudness feature is desirable to some people.
It's not a bad thing, however the endless sickening whines of self-proclaimed purists always seem to reject this feature.

 

[carlthess40]

PM sent, would be great to get the original part, because I really like the amp

I don’t have the oem part but I may have one that you could mod into it and get it up and running

 

[amplidude]

Okay, how much modding is required, I've been looking into which es amps are using this particular pot, because I have seen some sold in my country that are defect, if I'm lucky I might find a donor amp.

 

[amplidude]

I've looked at the pot and got an idea, the pot is tightened onto a thin metal plate with its nut, that leaves 13mm of pot thread in excess, how about carefully sawing away the excess thread, that would give roughly 10mm of pot axle, on the new pot and, put a connector and a fitting length rod, maybe not as sturdy as the old, but close.
Wont work for my situation since the pot got damaged, but for others.

 

[gmphadte]

The pot end could be slotted to look like a screw. Next is up to your imagination.

gajanan phadte

 

[amplidude]

Would look nice to, having a screwdriver as volume knob, think I'll pass.

 

[wiseoldtech]

All that messing around is futile and slop work, and only further damages an already broken pot.
Filing, grinding, etc will introduce metal filings into the thing, cause rough rotation and more damage.
Get a new pot, do the job proper, and move on.

 

[amplidude]

If a new pot was available I wouldn't have made this thread.