1/4" jack needed, tip is shunt, isolated make circuit

YouTube · Post by **xtian** » Thu Jan 30, 2014 4:21 am

This Mesa Mark I schemo shows a special jack with the standard tip shunted to ground when no plug is inserted, and ALSO an isolated make circuit. I'm not able to find both of these options in the Switchcraft line. Anyone know how to find?

I actually need this specific jack for my Mitchell Pro-100!

Smokebreak · Post by **Smokebreak** » Thu Jan 30, 2014 4:52 am

I think it's the 113 and I only say that because I found this thread a while back while researching the MkI. Looks like switchcraft carries 113X
http://music-electronics-forum.com/t269/

YouTube · Post by **xtian** » Thu Jan 30, 2014 5:02 am

Good try, but nope. Not the 113, nor any other listed on this PDF:

http://www.switchcraft.com/Drawings/110 ... ies_cd.pdf

YouTube · Post by **xtian** » Thu Jan 30, 2014 5:11 am

Here it is, in this PDF:

http://www.switchcraft.com/Documents/Ja ... matics.pdf

See XI (J4-1A).

OK, where do I order...

rock_mumbles · Post by **rock_mumbles** » Thu Jan 30, 2014 5:22 am

I thought this was it but it's not exactly it ...

http://www.tubesandmore.com/products/W-SC-13

http://ax84.com/bbs/dm.php?thread=459968

YouTube · Post by **xtian** » Thu Jan 30, 2014 4:08 pm

rock_mumbles wrote:I thought this was it but it's not exactly it ...

http://www.tubesandmore.com/products/W-SC-13

http://ax84.com/bbs/dm.php?thread=459968

Right, that's what's in the amp now, and the problem is it does not short the grid to ground when no plug is in the jack, and then you get some unwanted hum from the unused gain stage.

Structo · Post by **Structo** » Thu Jan 30, 2014 4:21 pm

How about the 14B?

http://www.switchcraft.com/Drawings/14b_cd.pdf

randalp3000 · Post by **randalp3000** » Thu Jan 30, 2014 4:36 pm

these old schematics don't show shorting jacks for the Mk1's or SOB?
http://www.webphix.com/schematic%20heav ... oogie.html

YouTube · Post by **xtian** » Thu Jan 30, 2014 5:07 pm

randalp3000 wrote:these old schematics don't show shorting jacks for the Mk1's or SOB?
http://www.webphix.com/schematic%20heav ... oogie.html

I agree, they don't. But they don't show EITHER jack shorting the tip to ground, and I know that causes trouble in a high-gain amp!

YouTube · Post by **xtian** » Thu Jan 30, 2014 5:08 pm

Structo wrote:How about the 14B?

http://www.switchcraft.com/Drawings/14b_cd.pdf

Has a "break", not a "make" circuit, and not isolated. Thanks, though.

randalp3000 · Post by **randalp3000** » Thu Jan 30, 2014 5:12 pm

You could shoot Boogie an e-mail. They're usually pretty nice and helpful. Could be something proprietary that's custom made.

YouTube · Post by **xtian** » Thu Jan 30, 2014 5:42 pm

randalp3000 wrote:You could shoot Boogie an e-mail. They're usually pretty nice and helpful. Could be something proprietary that's custom made.

Yes! Did that this morning. Will let you know.

JazzGuitarGimp · Post by **JazzGuitarGimp** » Thu Jan 30, 2014 7:13 pm

xtian wrote:
randalp3000 wrote:You could shoot Boogie an e-mail. They're usually pretty nice and helpful. Could be something proprietary that's custom made.
Yes! Did that this morning. Will let you know.

I had a pleasant exchange with MB when I had a DC5 on the bench for repair. I'm sure they will help you out.

YouTube · Post by **xtian** » Thu Jan 30, 2014 7:23 pm

Yup. Just got off the phone. Part 610130. $12.95 (!!) plus shipping.

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1/4" jack needed, tip is shunt, isolated make circuit

1/4" jack needed, tip is shunt, isolated make circuit

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Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit

Re: 1/4" jack needed, tip is shunt, isolated make circuit