Finding Bifuricated wrap pins that are exact replacement seems impossible for certain types. I could not find any for my Pioneer SX-939. So I came up with this fix. Using 18 gauge brad nails from an air nailer I cut them to size and bent them to fit. It turned out to be a pretty good fix. Many I read just solder the wire to the board but this just does not seem right for a restoration.
If anyone is interested in this here is a link to the pictures <blockquote class=”imgur-embed-pub” lang=”en” data-id=”a/3TeAsS8″ ><a href=”//imgur.com/a/3TeAsS8″>Pioneer SX-939 AWH Power Amp Assy Board</a></blockquote>//s.imgur.com/min/embed.js
If anyone knows where to get the exact replacement I would appreciate knowing where to get them.
Why do they have to make this so complicated and confounding to edit or delete a post ???? When someone posts there should be an easy way to delete that post if they so choose to do so. Then the time out to edit is ridiculously short. It should be at least 5 minutes. Then there is the IMGUR which is also non intuitive. GOD it just chaps my hide being an M.S.T. teacher when I come across such non intuitive things.
Now as for the link to pictures
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@john-barron that is a main reason I have not posted pictures so far! Anyway, creative solution to your problem. Do they solder well? I try to keep a supply of lead clippings, some are large enough to do that job in a pinch.
Radios + Tubes + Scopes + Cars= Nothing better!
@john-barron, Can you salvage from a board that is going to be scraped? Just my $0.02, I am a new member, just looking around. Wish you well.
@radtekman They solder excellent, just before you solder them in place give them a quick light sanding with fine grit sand paper and dip them in RA Flux. Start heating the pin first before applying solder. Since they are not bifurcated like the original I applied a little extra solder so they don’t twist. I tried the lead clippings but I find these to better. They are stronger and don’t bend or twist as easy as clippings or even the original wrap pins. If you look closely you can see pin 26 is broken off which I noticed after taking the picture. I’m going to replace that one as well.
As for posting pictures I now have written down the procedure and use Imgur. The only down side is you can’t post multiple pictures all at once with one link. You have to copy and paste each link separately into the post then post the pictures as a group. So each of these pictures are a separate link.
@radtekman Oh I forgot to mention you need to cut the heads off the mail with all the scoring otherwise they will break off.
@novice01 I would if I had one or even could find one that had those type and size pins.
John Barron, my background is more in the metalworking arena, when I see small wire that needs a bend like the 2nd pic shows, I would accurately measure (with a micrometer) one like you need and find any wire, paper clip, MIG welding wire, etc, to bend in the shape shown, tin-it with solder before installing in PCB, & resolder in PCB. But, electrical experts may have a preference to the type of steel material that you start with.
Only today have I see the messages! sorry
@novice01 The problem I had with finding a replacement was that the pins are larger than any direct replacement I could find to order. Even the ones I did order came back to small. Then there is the fact that the wire gauge on one side of the board is 18 gauge. Using a wrap tool with that gauge is a lot of torque stress and that is why so many pins twist off. I had to find a material that was both the right size and had sufficient torsional yield strength to prevent twisting off the pins. When I found these brad nails in my garage they turned out to be an excellent fit.
I also found searching on line that this is a common problem not being able to find these old style and size pins. Many people that posted solutions just solder the wire to the board. But that is not a restoration just a fix. If people want to have a more original solution replacing the pins is the way to go. So I just wanted to post this solution for anyone who had similar problems restoring old amps.