Pro One knob overhaul!

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Jabberwalky
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Pro One knob overhaul!

Post by Jabberwalky » Fri Mar 20, 2015 4:05 am

My Pro-One restoration is complete! You can see the early photos of the me removing the original knobs. Also notice that the LFO is actually just another VCO chip CEM3340, just limited by it's wiring.

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They were crusty, and nasty, and often crackled.

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You can see where I installed brand new panel mounted pots, with ultra smooth twist. SCI went super cheap by using 100k pots for every parameter, even the volume!

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Then you can see how I had to mount the panel nuts to the front panel, which gives them an ultra tough grip with absolutely no wobble. This is the sort of feel you only get from top tier Moog type s**t.

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And the finished product. Like brand new, and very tweakable. The subtleties of the Pro1 are much easier to attain now!
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Re: Pro One knob overhaul!

Post by ninja6485 » Fri Mar 20, 2015 5:29 am

Great work! No need to ask how it feels... How long have you been working on this project? (And can you do my 303, lol...)
This looks like a psychotropic reaction. No wonder it's so popular...

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Re: Pro One knob overhaul!

Post by bhrama » Fri Mar 20, 2015 2:06 pm

nice work Jabb, bet this is a great improvement.

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Re: Pro One knob overhaul!

Post by Jabberwalky » Fri Mar 20, 2015 4:12 pm

Thanks! It actually only took half a day. It was mostly just waiting on the pots and knobs to come in. The desoldering of ancient rusted knobs was the most painful part of it. Also adjusting the legs of the new pots took some work.

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Re: Pro One knob overhaul!

Post by Cybercardinal » Fri Mar 20, 2015 4:42 pm

Cool. Might do that to mine. Which knobs did you get?

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Re: Pro One knob overhaul!

Post by Jabberwalky » Fri Mar 20, 2015 5:28 pm

They're 100k linear 16mm pc mount pots and the knob were from all electronics. They are not exact replicas of the originals but as close as you can get these days.

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Re: Pro One knob overhaul!

Post by Blue Monster 65 » Fri Mar 20, 2015 7:22 pm

That looks pretty lousy, Jabber - just send it on to me and I'll fix it up for you, OK? I promise to get it back to you ... umm ... soon ... yeah! soon! :lol:

Very cool that you under took this. Always nice to see something so well loved and taken care of.
Muhahahahahahahahaha!

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Re: Pro One knob overhaul!

Post by Jabberwalky » Fri Mar 20, 2015 7:32 pm

Haha thanks! This was the pro one that I'm certain spent a good part of its life underwater somewhere.

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Re: Pro One knob overhaul!

Post by Stab Frenzy » Sat Mar 21, 2015 12:43 am

Did you screw the pots to the panel before you soldered the legs or is that not possible on the Pro One?

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Re: Pro One knob overhaul!

Post by Jabberwalky » Sat Mar 21, 2015 3:42 am

I think it could be possible, but I didn't do it that way. The pcb is mounted directly below the panel. It just took a bit of tweaking to get everything to line up.

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Re: Pro One knob overhaul!

Post by Aaron2 » Sat Mar 21, 2015 6:11 am

So I assume the original Pro 1 knobs did not screw to the front panel? If so, the new pots are quite an upgrade, indeed. They must feel super tight. Good job, Jabber!

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Re: Pro One knob overhaul!

Post by Blue Monster 65 » Sat Mar 21, 2015 9:41 pm

Back in about 1989 or so, one of the pawnshops I frequented had a Pro One in that they offered to me for $50. I didn't have the cash on me at the time, so I passed.

I'm still kicking myself for that.
Muhahahahahahahahaha!

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Re: Pro One knob overhaul!

Post by celebutante » Sat Mar 28, 2015 7:09 am

Don't feel bad. I bought my Pro-One years ago for $30... then sold it to a friend (who wouldn't leave me alone about it) for $200. Idiot move!
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