really stupid jack wiring question

[wsaraceni]

im building a matchless vibrobox. here is the schematic.

http://www.prowessamplifiers.com/schema ... robox.html

so i have some cliff jacks that id like to wire up for the input and output. i can just never figure out what goes where.

i have the input wired like this

http://www.geckoamps.com/milliAmp/cliff-wiring.jpg

with the other resistor directly on the tube socket.

how does the output get wired?

[Structo]

The symbols on the schematic look like they are calling for switching or shorting jacks.
I don't really see the need.

The Cliff jacks are a little harder to visualize what's going on inside.

He can use shorting jacks if he wants but this is basically an effect so it will either be in circuit or turned off.

[wsaraceni]

should it be on that side or the other side? i know one side, when the cable is plugged in, is no longer in contact with the plug. i guess it'll be easy to figure out which one is correct in person.

how does a switching or shorting jack work?

[selloutrr]

when in doubt plug in a patch cable or instrument cord and meter continuity

[Drumslinger]

exactly!

[martin manning]

wsaraceni, on Cliff jacks you can see that the terminal/contact pieces are L-shaped, and overlap on the rounded (open) side of the body. The one that is on top is lifted by the plug and remains in contact with it, while losing contact with the terminal underneath. You can just see the tip of the upper terminal on the near side in the picture Structo posted above, meaning the terminals on the far side are the ones that contact the plug, and the wiring he has shown is incorrect.

The jack shown in the Cliff wiring .jpg you posted is wired correctly, and it is wired as a shorting jack, since it shorts the signal lead (center of the coax) to ground when there is no plug inserted. The shield braid is soldered to the sleeve terminal, and the diagonal jumper keeps it connected to the circuit ground at all times. The Vibrobox input and output are wired in exactly the same way as this picture shows. If you're not using shielded cable, you still need the jumper, just omit the shield

[Bob-I]

The symbols on the schematic look like they are calling for switching or shorting jacks.
I don't really see the need.

Actually the reason for a switching jack is to ground the input when you pull the cable out, otherwise you'll get some pretty bad hum.

[wsaraceni]

just so im clear. with no patch cord plugged in, i should see the tip directly to ground. with the patch cord plugged in the tip should see 220k to ground and the sleeve should be grounded always. is that right?

[Bob-I]

just so im clear. with no patch cord plugged in, i should see the tip directly to ground. with the patch cord plugged in the tip should see 220k to ground and the sleeve should be grounded always. is that right?

Correct.

[FYL]

I believe this is how it should be wired.

Nope, the 220K goes to ground.

[M Fowler]

When I recently built my 18w tremolo amp I referenced three layouts and each one was wired differently which drove me nuts.

Did I say I hate Cliff jacks? I understand how they are important grounding wise but geez.

Mark

[Structo]

I believe this is how it should be wired.

Nope, the 220K goes to ground.

You are right, I guess he isn't the only one that has trouble with cliff jacks.
I haven't used that many myself.

[FYL]

You are right, I guess he isn't the only one that has trouble with cliff jacks.
I haven't used that many myself.

Front = ground
Back = signal

Here's a typical hi/low setup:

[img:730:428]http://triodeamplification.com/images/cliff_hi-lo_2.gif[/img]

From the Triode Amplification web site.

[M Fowler]

Okay now that makes sense I didn't notice the reversing of the hi/lo positions before. Thanks.