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UREI 535 JJ Electronics Mod
Old 27th July 2019
  #1
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Brian M. Boykin's Avatar
UREI 535 JJ Electronics Mod

Wanted to share this mod to fix the slide pots on a UREI 535 EQ. I have 3 of these and all 3 have been upgraded with this kit. It’s a new PCB that accepts Bourne slide pots. They have directions on their site but I thought I’d share my tips for those of you wanting to do this.

First pic is of the old pots and how dirty they are. This was the worst I’ve seen of the 3 I have. They were almost impossible to move. No amount of love can save them from this condition.
Attached Thumbnails
UREI 535 JJ Electronics Mod-8712426e-e7d2-4a68-a0f9-9c51597e131f.jpg  
Old 27th July 2019
  #2
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Brian M. Boykin's Avatar
Next pic is of the new pots mounted on the new PCB. They solder right on. There’s not much room for play left to right so I just solder them to the PCB making sure they are all the same height. The instructions have you mock up the PCB but I found an easier way that allows for adjustment at the end.
Attached Thumbnails
UREI 535 JJ Electronics Mod-d41f5fb4-d051-4984-a128-77be5bf53eca.jpg  
Old 27th July 2019
  #3
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Brian M. Boykin's Avatar
Next you have to drill holes for the new PCB to mount to the old one. I mock it up at this point partially assembled and the unit sitting with the face facing up. This part is similar to the instructions but the slide pots are soldered on. This allows you to center everything with the face plate set in position. You mark the old PCB and drill oversized homes: I used a 1/4” drill bit. Then you can solder the connecting wire per the instructions and then mount the new PCB. Looks like this. Those are 3/4” spacers with 1 1/4” machine screws and buts. #6 I believe. Lock washer and washer on the nut side. You can see in one picture the PCB is warped a bit. I fixed this by drilling the holes a little larger to relieve the tension. The oversized holes now allow you to shift the new PCB around until everything is lined up correctly.
Attached Thumbnails
UREI 535 JJ Electronics Mod-a8e69669-2b4f-4710-9597-d44aa36f5b8d.jpg   UREI 535 JJ Electronics Mod-2441a0e9-2553-418a-8f6d-794b688905b5.jpg   UREI 535 JJ Electronics Mod-a0cac4bb-c6cd-43de-afc0-3bad6912a807.jpg  
Old 27th July 2019
  #4
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Brian M. Boykin's Avatar
Here are before and after pics of the faceplate not aligned properly and then aligned properly after shifting the new PCB.
Attached Thumbnails
UREI 535 JJ Electronics Mod-638471a0-d2f9-4acd-93c8-d1702c28290c.jpg   UREI 535 JJ Electronics Mod-26806850-70de-446f-b0f1-1feeb2b71b86.jpg   UREI 535 JJ Electronics Mod-77a3197d-6141-4682-8e80-5d8807424c13.jpg   UREI 535 JJ Electronics Mod-41f8611f-a197-4cf8-b085-060ceada35e1.jpg  
Old 27th July 2019
  #5
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Brian M. Boykin's Avatar
Here’s the last pics of all three in the rack and a pic from the inside of the 1/4” jacks I added. I use these on kick, snare, and toms post compression. They are a gyrator design which is proportional Q. They have an output transformer and have a nice sound. I recap them and drop in lme49740’s with decoupling. They already have WIMA and EVOX films so I leave them. Two of mine had electrolytic caps in place of the tant’s and one still had the tants in the audio path.
Attached Thumbnails
UREI 535 JJ Electronics Mod-8dc242f8-47dc-4465-86dd-580ce70ebab0.jpg   UREI 535 JJ Electronics Mod-e5afd433-59ba-4546-bc7e-13ec7cfefe98.jpg  
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