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FDP Forum / Amp Mods, Repairs, and Projects / Plastic jack nuts on Roland amp

capnhiho
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Bakersfield, CA

I'm not a guitarist . . .
Jul 30th, 2018 07:17 PM   Edit   Profile  

I recently noticed that the input jack on my Roland BC 60 was loose. Upon closer inspection I found that the plastic mounting nut was cracked. As a temporary fix I swapped nuts with a jack that I seldom use (foot switch for reverb on/off), but I’d like to make a permanent repair. I’ve read enough to suspect that a metal nut won’t work due to isolation concerns. A quick search of the innerweb turned up a similar but not close enough nut from AES but I haven’t yet found the right size - i.d. of the nut measures about 0.418” with my digital caliper. Can anyone steer me in the right direction? I suspect S&H charges will far exceed the cost of a stupid nut, but that’s life ;o)

BbendFender
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American Patriot

About as ordinary as you can get.
Jul 30th, 2018 08:09 PM   Edit   Profile  

I hate plastic nuts like these. This is the reason I play old Fender amps.
I'd search through your parts and see if you can find a metal nut and see if it will hold. You might also put a drop of super glue on the threads and that might hold the input in place.
This is just what I'd do.

Peegoo
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Ooo that sandwich

is gonna get et
Jul 30th, 2018 08:14 PM   Edit   Profile  

Good advice.

If the original plastic nut threads onto a plastic jack body, there's no worries about insulating the nut from the faceplate.

Also, the advice about CA glue is good. Just a teensy dab.

Thread lock, e.g., Loctite, etc., will not work when plastic is involved because the adhesive requires copper ions (present in steel) in both surfaces to cure it hard. On plastics, the Loctite stays gooey.

Hammond101
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So. Cal. USA

Jul 31st, 2018 02:31 PM   Edit   Profile  

I hate to tell you how many jacks I have in a parts drawer that are missing the nut.

I work on many amps and find a lot of cracked nuts. I also have had my share break when attempting to tighten them.

AES sells the nut for Cliff jacks but none of the others. Roland must use something else.

Te 52

Laws of Physics

strictly enforced
Jul 31st, 2018 04:20 PM   Edit   Profile  

Not sure if either of these is the right part, but...

...check it out.

Te 52

Laws of Physics

strictly enforced
Jul 31st, 2018 04:21 PM   Edit   Profile  

Also...

...this.

Peegoo
Contributing Member
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Ooo that sandwich

is gonna get et
Jul 31st, 2018 04:42 PM   Edit   Profile  

One thing I've done in the past is borrow a nut from another jack on the amp that doesn't get much use.

I install a replacement metal nut there and use the plastic nut where I need it.

Hammond101
Contributing Member
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So. Cal. USA

Jul 31st, 2018 05:02 PM   Edit   Profile  

Wow, Full Compass is sure proud of those at $4.95 a pop. I scrolled down that Ebay page and a seller in Japan has a 10 pack for a bunch less. Only $3.00 shipping. I'm going to buy some for inventory. Maybe I'll get them in a month!

capnhiho
Contributing Member
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Bakersfield, CA

I'm not a guitarist . . .
Jul 31st, 2018 05:36 PM   Edit   Profile  

As I mentioned above, I swapped the nut on the input jack with one from an unused jack - nothing compatible in my spare parts stash. Today I spread the crack on the bad nut open, worked a little gel super glue into the gap, and gently clamped it for a couple of hours. Carefully screwed it back onto the reverb on/off footswitch jack and all appears well.

So far, so good. Should get me by until I can come up with a permanent fix, either plastic or metal.

(Edited to add: Thanks once again to my FDP brothers!)

(This message was last edited by capnhiho at 09:05 PM, Jul 31st, 2018)

Peegoo
Contributing Member
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Ooo that sandwich

is gonna get et
Jul 31st, 2018 07:07 PM   Edit   Profile  

The drawback to a metal nut is that they're generally designed to be used with a metal jack body.

The concern is the thickness of the nut: If you have two full threads in it, you're lucky.

Plastic jacks' threads are softer than metal ones, so the nut has to have more threads in it to secure the jack to the face plate. Hence the plastic nut is thicker than the metal one, and usually has three or more threads. See pic.

If you do use a metal nut on a plastic jack, it's good practice to thread a second nut atop the first one. That gets a better hold on the jack's threads and prevents it from being overstressed.

This is critical because most plastic jacks are PC board-mounted, and if the nut fails or is loose, the only mechanical connection is the solder joints on the PC board. They will break loose over time.

If you buy a nut by itself, you will usually pay more than the cost of an entire jack with the nut on it.

Nuts!

FDP Forum / Amp Mods, Repairs, and Projects / Plastic jack nuts on Roland amp




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