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Post subject: Fender footswitch: problems replacing old RCA plugs with one
Posted: Tue Jan 07, 2014 12:54 pm
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Hi,
I have here my old 1972 Fender Deluxe Reverb and I got a bit tired of resoldering the RCA plugs every 10 gigs, so I decided to replace the RCA plugs with one stereo 1/4" jack (just like the reissue fenders).

Took out the (reverb-side) RCA female and replaced it with a stereo 1/4" female. Then soldered the reverb to tip and vibrato to sleeve. There is also a capacitor that goes to the ground of the former vibrato RCA plug. Here is a pic, not mine though:

Image

But since it simply goes to ground I left it there at the ground of the "former" vibrato RCA.

Seemed like a perfect fix, but I have a problem:
I have a loud "click" sound when I push the vibrato switch. Here's the problem in detail: when the reverb is switched OFF and I push the vibrato their is never a click sound. So in this case the vibrato can be switched on and off without any noise...
But when I switch the vibrato on and off with the reverb switched ON I always have the loud "click" noise!

Does anyone have any idea what could be the problem here? I'm a bit surprised that it's so hard to change the RCA plugs to one stereo 1/4" plug... Then how is it done in the reissue Fenders that also work with a 1/4" plug for the footswitch?

Thanks!


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Tue Jan 07, 2014 2:19 pm
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The 1/4 jack used in the Deluxe Reverb Reissue use a 220 pf capacitor on the tip .

Do you have one ?

I did not see you 1/4 jack on photo

A mod ( hole ? ) on this 1972 amp is a crime for me .

Esy to find a way to use safely your reverb/ vibrato footswitch with RCA phono plug


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Tue Jan 07, 2014 2:39 pm
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stratele52 wrote:
I did not see you 1/4 jack on photo

If I may (without getting crap from the forum police):

bram9206 wrote:
Here is a pic, not mine though

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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Tue Jan 07, 2014 3:40 pm
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That's right, the picture is not mine and so isn't the amp...
But since both amps are from the same periode (early seventies), mine also has the beige disc cap you see on the reverb output RCA plug. But I guess that disc cap has nothing to do with it...? Or does it?

Just don't understand what causes the "click" sound when pushing the vibrato knob and why it wasn't there before the mod...

Anyone?


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Tue Jan 07, 2014 6:52 pm
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bram9206, welcome to the Forum! :D

The "click" is prolly due to a solder point that went bad, while you modified the circuit. Use a wooden chopsticks to find the bad point(s). High voltage precautions, as usual.


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 2:20 am
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bram9206 wrote:
That's right, the picture is not mine and so isn't the amp...
But since both amps are from the same periode (early seventies), mine also has the beige disc cap you see on the reverb output RCA plug. But I guess that disc cap has nothing to do with it...? Or does it?

Just don't understand what causes the "click" sound when pushing the vibrato knob and why it wasn't there before the mod...

Anyone?


You did not answer to my question about a 220PF capacitor on the "tip ". I guess you did not put one because you have to buy one.
Did you use same footswitch ot it is a new one you build ? Footswitch case must be to ground.

IMO you did not do the wiring as the Reissue Deluxe reverb schematic show .


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 2:31 am
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stratele52 wrote:
Footswitch case must be to ground.


+1

And the ground lugs of both switches must be securely soldered to the inside of the housing. If the interior of the housing is painted, be sure to scrape away all of the black enamel where you intend to solder the ground bus to.

Arjay

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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 2:55 am
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Retroverbial wrote:

And the ground lugs of both switches must be securely soldered to the inside of the housing. If the interior of the housing is painted, be sure to scrape away all of the black enamel where you intend to solder the ground bus to.

Arjay



Or use a bolt if case/ housing is aluminium .


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 4:34 am
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Thanks for all the answeres.

I'm still using the original footswitch that did a perfect job before I did the 1/4" mod. Chassis is well grounded etc...

I didn't use a 220pF cap because it wasn't there with the RCA's either. Don't understand why I would need it now. I mean, why does it work perfectly with RCA and why would I need a 220pF cap now with the 1/4" plug to prevent "click" sounds?

And how is the reissue Deluxe 1/4" female soldered?

I will do the "chopstick" test this afternoon, just to see, indeed, if there are any bad solder joints.

Thanks


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 5:12 am
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bram9206 wrote:
Thanks for all the answeres.

I'm still using the original footswitch that did a perfect job before I did the 1/4" mod. Chassis is well grounded etc...

If you are sure , good, see elsehwere now ...

I didn't use a 220pF cap because it wasn't there with the RCA's either. Don't understand why I would need it now. I mean, why does it work perfectly with RCA and why would I need a 220pF cap now with the 1/4" plug to prevent "click" sounds?

You did not understand why you need one ? Because you do the mod exact copy like the Reissue 1/4 jack or you keep RCA jack . No half mod.

And how is the reissue Deluxe 1/4" female soldered?

What do you mean ? Look shematic it say all

I will do the "chopstick" test this afternoon, just to see, indeed, if there are any bad solder joints.

Thanks


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 6:59 am
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Just did a check with a wooden chopstick, but no results. All solder joints seems to be good.

Can anyone confirm I actually need to add a 220pF cap like Stratele52 says and how?

Stratele52, you told me to look at the RI schematic, but I can't find a 220pF cap... Also, their is no cap in the layout, whereas there is one in pictures I've seen from Deluxe RI's... Or maybe there is a difference in 1990 Deluxe's and 2000 Deluxe's?

Just one more thing: there is a 220K resistor (in the 1972 Deluxe) soldered to the tip (reverb). Anyone knows its function and could it be that it has gone bad?

Thanks


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 7:47 am
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bram9206 wrote:
Just did a check with a wooden chopstick, but no results. All solder joints seems to be good.

Can anyone confirm I actually need to add a 220pF cap like Stratele52 says and how?

Stratele52, you told me to look at the RI schematic, but I can't find a 220pF cap... Also, their is no cap in the layout, whereas there is one in pictures I've seen from Deluxe RI's... Or maybe there is a difference in 1990 Deluxe's and 2000 Deluxe's?

I look a 68 Deluxe Reverb RI for the cap, shematic I have at home. You are right the 65 DRRE did not have this cap .Did you need it to remove the "pop " ? I really don't know

Just one more thing: there is a 220K resistor (in the 1972 Deluxe) soldered to the tip (reverb). Anyone knows its function and could it be that it has gone bad?


There is also a 2000 pf too . IMO it is to send some frequency to ground ( remove some noise )


Thanks


Did you use shielded wires , ? Both wires are shielded and shields are connected together / to the 1/4 jack 's sleeve ?
More information about your job , footswitch wiring please. and some pictures may help to see what is wrong


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 8:19 am
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How are you isolating the Stereo jack from the chassis?

If I'm understanding properly, the one function isn't working because you're shorting to ground.

cheers!

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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 8:33 am
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Lightnin MN wrote:
How are you isolating the Stereo jack from the chassis?

If I'm understanding properly, the one function isn't working because you're shorting to ground.

cheers!



The stereo jack must not be isolate from the chassis . On schematic , sleeve is to ground . You need this ground to activate/ control reberb and tremolo.

Everything work but there is a loud pop when activate.


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Post subject: Re: Fender footswitch: problems replacing old RCA plugs with
Posted: Wed Jan 08, 2014 8:43 am
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Here are some pictures I took this afternoon of my Deluxe Reverb with the 1/4" mod and footswitch. Hope this helps locating the problem.

Image
Image
Image
Image
Image
Image
Image


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