Isolating jacks from the chassis

[fred.violleau]

Hey guys,

I bought on Hoffman's forum some plastic shoulders that you slide onto the jacks to isolate them from the chassis.

Trouble is these are a little too big if you use two pieces (one inside and one outside.

I found on an old RCA tube projector these great little piece (these probably date back to the 60s) but anyway, does any one knows if these are still being made and if so, where I could order some?
Here is a pic that compares regular plastic shoulder with the RCA isolation washer.

[attachment=0]PXL_20220214_012344693.jpg[/attachment]
[attachment=1]PXL_20220214_012133884.jpg[/attachment]

Thanks for your feedback!

Fred.

[thetragichero]

https://www.tubesandmore.com/products/w ... ing-panels
https://www.tubesandmore.com/products/w ... ing-panels

[Matthews Guitars]

Keystone fiber shoulder washers. Available at Mouser.

https://www.keyelco.com/category.cfm/Sh ... 3/c_id/813

P/N 3069 is most likely the one you want. 3/8" ID, works in a 1/2" hole. Get two, or one and a flat washer, for each part to mount.

https://www.mouser.com/ProductDetail/Ke ... TRvw%3D%3D

The associated flat fiber washer to go with it is P/N 3142.

[ChopSauce]

I'd put two shouldered washers if there's enough thickness to support that, for pure reliability reason.
(NB in Europe we can buy these (S1029 & S1028) like if they were made by switchcraft. See: https://www.tube-town.net/ttstore/switc ... s1028.html and https://www.tube-town.net/ttstore/switc ... s1028.html )

[fred.violleau]

Fantastic! Thank you guys, you are an amazing ressource!

@chopSauce, that is what I would do as well on a silk screen chassis for example. But I mostly order faceplates and if you add up the shoulder washer X2 + chassis +faceplate, then you can't lock the jack anymore

Fred.

[Matthews Guitars]

Have a bin of flat washers, and a bin of shoulder washers. Use one shoulder washer if the mounting panel is too thin for two. Use two if it's thick enough to take them. Simple.

[sluckey]

@chopSauce, that is what I would do as well on a silk screen chassis for example. But I mostly order faceplates and if you add up the shoulder washer X2 + chassis +faceplate, then you can't lock the jack anymore

The Switchcraft L12A jack has a longer threaded bushing that should solve this problem.

[ViperDoc]

When using a faceplate that fits properly (your faceplate and chassis holes actually line up), I've used a single isolation washer inside the chassis and the usual jack flat washer and nut over the faceplate with no problems.

[jabguit]

When using a faceplate that fits properly (your faceplate and chassis holes actually line up), I've used a single isolation washer inside the chassis and the usual jack flat washer and nut over the faceplate with no problems.

Unless your faceplate, washer and nut are metal.


cheers,

[maint_tech]

http://store.chriselectronics.com/produ ... at=&page=1

[ViperDoc]

When using a faceplate that fits properly (your faceplate and chassis holes actually line up), I've used a single isolation washer inside the chassis and the usual jack flat washer and nut over the faceplate with no problems.

Unless your faceplate, washer and nut are metal.


cheers,

I admire your thorough perspective! YES, unless your faceplate is metal. Now if your faceplate and isolation washer are acrylic/nylon, that should be OK, I would think.

[fred.violleau]

I mostly have the faceplates printed on aluminum, I usually prefer the look it has.

Order of flat washers on the way, and thanks @sluckey for the reference for the longer threaded bushing, if the price difference is minor, I might consider these than the usuals, as two shoulder washer is definitely better.

Fred.

[sluckey]

In the AES link I posted the standard 12A cost $2.40 and the L12A costs $2.35. Seems backwards to me. Maybe AES has an overstock on the L12As.

[Phil_S]

There is an aspect of this thread that fascinates me. It reminds me of the old saying, when the only tool you have is a hammer, every problem looks like a nail.

Use Cliff jacks. All the chassis contact parts are plastic and therefore isolated. They are in the same price range as Switchcraft. Problem solved! https://www.tubesandmore.com/products/1 ... s-switched
They even have these, if you want steel nuts on the faceplate side of the jack. https://www.tubesandmore.com/products/n ... ated-steel

[Leo_Gnardo]

Keystone fiber shoulder washers. Available at Mouser.

https://www.keyelco.com/category.cfm/Sh ... 3/c_id/813

P/N 3069 is most likely the one you want. 3/8" ID, works in a 1/2" hole. Get two, or one and a flat washer, for each part to mount.

https://www.mouser.com/ProductDetail/Ke ... TRvw%3D%3D

The associated flat fiber washer to go with it is P/N 3142.

I've been using these washers for decades, the only problem occasionally it would be good to have a flat washer that isn't so thick. I save thin flat washers - both nylon and fiber - from scrapped gear but never manage to have more than two or three on hand.

and

maint_tech, I've tried your link but it always "times out". Curious what wonders chriselectronics may have for us.