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Silver St888 Volume Pot

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#31 caution

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Posted 25 May 2019 - 12:32 AM

If you bypass it, does increasing the bass/treble at lower volumes still make it sound nice? Can you even crank them far enough to do so? If yes, then this is probably the best way to go, because the loudness circuit isn't even a factor above 40-50% volume.


If it's bridged, you affect the entire volume range. Instead of tapering off as you approach halfway, it's 100% boosting, so you might have to turn down the bass/treble to compensate. Anything over 50% is even worse because now it has a loudness filter when it never did before, and turning down the bass/treble may not be enough, or may not be the right kind of compensation because the loudness circuit boosts different ranges than the bass/treble knobs and breaks differently. Just try it both ways and see which one sounds better for you.

#32 Chester Draus

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Posted 25 May 2019 - 07:49 PM

Alright so a status report.

Carbon tracks were all good on the pot.

I ended up putting some tails from the pot to the PCB so I could assemble the box and get the wipers on where they needed to go and used some temporary glue strips to hold them in place. (all rivets had snapped flush so it was a little bit of a gamble getting them spot on)

Happy with the location, I glued them in place and lubed the pot - all good! Feels nice, tone and loudness sound like they're working, no scratches, although one issue I have is the location must be just a tiny bit off as the volume doesn't quite cut out, literally just a whimper gets through.

Thanks all for the assist! It's great to have this thing actually working and it sounds fantastic! I do have a lot more work to go;
- one mid / high speaker to replace
- repair the casette player
- replace the lamps
- The bass pot needs work (I found another wiper in the bottom of the case and the bass pot does have issues)
- A clean! It's filthy

I'll start a fresh thread to cover the rebuild. Again, appreciate the help it's great to see people so willing to lend a hand, hopefully I can return the favor one day.

#33 caution

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Posted 10 June 2019 - 01:42 PM

Since all threads older than a year have been locked, and I don't want to start another thread just about this pot, I'll post it here.


dual 50K Alps pots with a center tap are still available, I totally forgot I bought one a while back. They may take a bit of finagling to fit on some radios, but they are an option.


There are two styles, not entirely sure what the difference is as they are both log (A) 50K pots with a center tap.