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Old 3rd June 2011, 11:38 PM   #1
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Default MIL-W-16878/4 for Wire Wrapping

Fixing a vintage amp that has wire wraps to the outputs. Would this be suitable or should I get milspec wire wrap wire? It is solid core copper with silver plating...
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Old 4th June 2011, 12:44 AM   #2
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I have no data on mil part numbers. Wire wrap came in two sizes, I am aware of. 26 gauge, and 30 gauge. 30 gauge tools are still available from OK at newark and other distributors, but I haven't seen 26 gauge tools for a long time. The big magnate in wirewrap was gardner denver corporation, the air compressor manufactures, now a tiny division of some conglomerate that doesn't care anymore. Take your wire and measure with a micrometer, and compare to the diameter listed for that wire gauge on the alphawire website or someplace. 30 gauge posts were .025" square, the 26 gauge posts in my Hammond H100 organ are not square. The silver plate was for dry circuits like TTL logic or stuff that didn't have enough energy to burn the corrosion off of tin. All the posts in TTL circuits were gold plated, which is why you never see these at surplus houses anywhere. BTW, the wirewrap was such a success in my organ that dealer service soldered three of the posts to the wire permanently. I don't guess 25 mv Hammond signals at 2.5 ohm source resistance have enough energy to burn tin corrosion off, either.
Strippers for 30 ga wire needed a positive stop to not nick the wire, and they used to make a $115 manual stripper (1970) that would pull exactly 7/8" of insulation off every time.
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Last edited by indianajo; 4th June 2011 at 12:47 AM.
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