Langevin 252a Slider Contacts

[gnomefather]

I recently picked up this Langevin 252a with some broken/ugly contacts. Does anybody have experience repairing these? As it stands it seems like these contacts may work, but I don't want to risk damaging the circuit board traces...

I'm also in the process of drawing up a schematic, I hope to post that soon.

 

[gnomefather]

Some (I think?) normal working contacts for comparison

 

[gnomefather]

Board that the contacts slide on

 

[gnomefather]

The rest of this band (800Hz)

 

[abbey road d enfer]

I recently picked up this Langevin 252a with some broken/ugly contacts. Does anybody have experience repairing these? As it stands it seems like these contacts may work, but I don't want to risk damaging the circuit board traces...

I'm also in the process of drawing up a schematic, I hope to post that soon.

I can see that some have already been "repaired" with solder...

 

[abbey road d enfer]

Some (I think?) normal working contacts for comparison

These are a different version, flatter contact area, different material.

 

[gnomefather]

I can see that some have already been "repaired" with solder...

Yes, those “repairs” were done by a previous owner...

These are a different version, flatter contact area, different material.

I got a 251a from Igor recently, opened that up and the contacts look quite different, like you say. I read in a Langevin catalog that these use “bifurcated” spring contacts, and I wrongly assumed that the “bifurcation” was the connection between the two contacts. On the 251a each contact pad is two-pronged.

I’ve looked through a lot of new PCB spring contacts but haven’t found any that seem like viable candidates. Looking like I’d need to rebuild this with switches... I have a bunch of Grayhill rotary encoders, and was thinking it may be more cost effective to use those (and an Arduino) to control sets of relays on each band. Otherwise I think I’m looking at like $1500 in switches.