5 terminal input jack 4 behringer amp..?

[castlewalls]

I traded some rarely used effects pedals for a Behringer GMX1200H (it's a head and sounds great) and then I noticed the input jack was stripped. Having done Mil-Spec soldering/assembly all my life, it was nothing for me to pull the head apart to check out the situation. The threads were stripped on the cheap plastic jack (all the tiny pots are a combo of plastic & metal too, but more on that later...;>).

The original jack has 5 terminals & is soldered to a small pcb with various components on it and a 4 wire connector leading to the 'main' board. When you plug a male into it, 2 connections are 'broken' and my loacal music store (who doesn't deal with Behringer) mentioned the 2 'broken connections' (or rather better described as 'internal switches') probably turn off the singnal to the preamp when there's no jack in the input...

Anyways, does anyone know of an online source to purchase any kind of 5 terminal female jack that would fit the bill? It doesn't have to be the same enclosed plastic affair as I can just hardwire it to the pcb. My local music stores don't carry any, Radio Shack is useless (as usual, in store or online) and I can't find anything online but I'm not sure if there's a specific name for that type of jack, I just search for 1/4" female jacks and come up with the usual mono/stereo ones.

The pcb the jack is soldered to has a short 4 wire cable (3 black, 1 red wire) from it to the main board and my local music store guy said 1 wire is probably the preamp switch feed.
Any help is appreciated in finding a replacement input jack!
-Jim

[newey]

CW-This is called a "switched 1/4" phone jack".

Try Mouser. They have a variety of different types, although I don't know if I've seen a 5 lug one. Is it possible that the 5th lug is to ground the frame of the component? That would make sense if there was just one thing being switched- it'll have 2 + and 2 - lugs, one of each gets switched when a plug is inserted.

These types of jacks are used as headphone jacks, to disconnect the speaker of a device when a headphone plug is inserted.

I'm using a similar jack in my (still uncompleted . . .) stereo Tele build to switch between mono operation and stereo (when the second amp is plugged into the switched jack.) With no plug inserted into that jack, both signals go to the other, mono jack.

Here's a 6-pin one that's probably close:

www.mouser.com/ProductDetail/Amphenol-Audio/ACJS-IH/?qs=t8VhaDIDl4utFcX05cTdTnEGdBqGeMFS



However, the best bet is to check the continuity of what you have in there now to be sure you get one with the correct schematic. These are made in several different configurations, you want to be sure to get the right type.

Put a multimeter to each lug in succession, with a plug inserted and without, to see what connects to what. Usually it's pretty obvious, but best to be sure before you buy a replacement.

[castlewalls]

Well after a time I wound up staring at the amps innards and noticed all the jacks on the back panel were the same type, so i took the unused footswitch jack out and used that for the input jack.
All fixed, works great!

[gumbo]

...but if you get sick of constantly replacing plastic jacks....


www.orvac.com/showitem.aspx?&id=104765&name=1%2F4%22%20Stereo%20Jack%2C%20Panel%20Mount%2C%20N%2FO%20%26%20N%2FC

[sumgai]

Jul 31, 2012 6:30:40 GMT -5 gumbo said:

...but if you get sick of constantly replacing plastic jacks....

Well, technically speaking (in English), replacing would be the case in any event, be it swapping two existing parts or inserting a freshly purchased part.

But true enough, one soon runs out of unused jacks that can be swapped, then the Purchasing Department gets into the act. Never hurts to be prepared.....

HTH



sumgai