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FDP Forum / Fender Amps: Vintage (before 1985) / Dual-RCA Reverb/Vibrato footswitch

Next 20 Messages  
mherrcat

Los Angeles

Jan 26th, 2012 06:04 PM   Edit   Profile   Print Topic   Search Topic

I just received a new dual-RCA type footswitch from Amplifiedparts.com (subsidiary of AES) to use with my '74SFTR. It is not a genuine Fender footswitch but was half the price.

I am getting a buzz when the switch is on and am about to send Amplified Parts an email. But before I do that I have another question about the function of the pedal.

Are the reverb and vibrato supposed to be able to be switched independently? With the footswitch plugged in the vibrato will not work unless the reverb switch is also depressed.

With the footswitch disconnected and a dummy plug in the vibrato input to turn it on, I can turn down the reverb to 0 and still have vibrato. I guess that technically means the reverb and vibrato are both on.

Just wondering...

SoK66
Contributing Member
****

USA

We had the hit but Van got the money
Jan 26th, 2012 06:10 PM   Edit   Profile   Print Topic   Search Topic

Try switching the leads on the jacks.

mherrcat

Los Angeles

Jan 26th, 2012 07:41 PM   Edit   Profile   Print Topic   Search Topic

The leads/plugs work either way, just reverses the function of the switches, but still have the buzz when the reverb switch is on. No buzz with just the vibrato switch on.

When I leave all the cable coiled up on top of the amp cabinet there is no buzz. But if I lay my hand on top of the coil of cable I get buzz. If I then touch the metal of the switch box I get an electrical pop and the buzz stops.

Seems like a grounding issue, but where? In the footswitch or in the reverb jack? The reverb has no buzz with or without a dummy plug in the reverb jack.

mickkotter

gretna, la

Jan 26th, 2012 09:04 PM   Edit   Profile   Print Topic   Search Topic

mhc;

try shielding the foot switch with the metal foil tape on the plastic cover. (the cover on the bottom of the switch. remove it, and put the foil on the cover and replace)

this worked for me, when i had a weber revibe kit (reverb and harmonic vibrato) built for me. when i used a fender switch (like you describe) i got a loud hum. after the shielding, no hum.

(This message was last edited by mickkotter at 09:06 PM, Jan 26th, 2012)

mherrcat

Los Angeles

Jan 27th, 2012 02:20 PM   Edit   Profile   Print Topic   Search Topic

Shielding the foot switch did not do anything.

Checked the jacks and they appear to be well grounded to the chassis. They are panel-mount jacks and are clamped tight to the chassis with locking nuts/washers.

Guess I'll be talking to Amplified Parts about this...

lonesomebill

USA/Southwest

Don't watch my foot!
Jan 28th, 2012 10:53 AM   Edit   Profile   Print Topic   Search Topic

Does it use shielded cable like the Fender part?

mherrcat

Los Angeles

Jan 30th, 2012 12:33 PM   Edit   Profile   Print Topic   Search Topic

The cable is two-conductor, but only one of the conductors is shielded. That shield is tied to the ground terminal on both switches and to the metal foot switch case.

Does the Fender switch use shielding on both conductors? Maybe that is the problem.

Edit:

I have another OEM Fender foot switch for a later model amp that uses a 1/4" phone plug rather than the two RCA plugs. It also uses a two-conductor cable with only one of the conductors shielded. (But the shielding is a better quality braided shield.) The wiring inside the foot switch is the same as the Amplified Parts switch.

(This message was last edited by mherrcat at 12:53 PM, Jan 30th, 2012)

mickkotter

gretna, la

Jan 30th, 2012 12:53 PM   Edit   Profile   Print Topic   Search Topic

mhc;

which foot switch did you get?

don't think this one will work.

Link.

(This message was last edited by mickkotter at 01:02 PM, Jan 30th, 2012)

mherrcat

Los Angeles

Jan 30th, 2012 12:54 PM   Edit   Profile   Print Topic   Search Topic

Just checked another OEM Fender foot switch that I have for a later model amp that uses a 1/4" phone plug rather than the two RCA plugs. It also uses a two-conductor cable with only one of the conductors shielded. (But the shielding is a better quality braided shield.) The wiring inside the foot switch is the same as the Amplified Parts switch.

mherrcat

Los Angeles

Jan 30th, 2012 12:56 PM   Edit   Profile   Print Topic   Search Topic

That is indeed the foot switch I purchased.

(Sorry for the double-post; my edit wasn't showing up so I posted it separately...)

mickkotter

gretna, la

Jan 30th, 2012 12:59 PM   Edit   Profile   Print Topic   Search Topic

i don't think that one will work.

all of mine (older fender amps from '62 to '77

all have the braided cable.

the braided cable one is the one that i had to shield as described above.

link for possible one.

mickkotter

gretna, la

Jan 30th, 2012 01:14 PM   Edit   Profile   Print Topic   Search Topic

mhc;

FWIW:

regarding 'edit not showing up'.

i have to refresh the browser when i do an edit, otherwise the cached version of the page (previously edited page) shows, rather
than my edited page.

Steve Dallman
Contributing Member
*****

Merrill, Wisconsin

Dangit! Hot weather.
Jan 30th, 2012 02:02 PM   Edit   Profile   Print Topic   Search Topic

The audio signal of the reverb return is on the footswitch reverb cable. The tremolo doesn't need shielding, but it doesn't hurt.

That reverb footswitch cord has to be well shielded. I've replaced a lot of those cables to reduce hum in the reverb.

mherrcat

Los Angeles

Jan 30th, 2012 02:29 PM   Edit   Profile   Print Topic   Search Topic

Thanks for the replies.

mickkotter;

The second link you posted is the same foot switch, just the black version. :)

mickkotter

gretna, la

Jan 30th, 2012 08:35 PM   Edit   Profile   Print Topic   Search Topic

the advert says:

"For use with: Early Twin Reverb®, Deluxe Reverb, Pro Reverb, Super Reverb, Bandmaster Reverb, (All vintage amps with dual footswitchable on/off functions requiring RCA connectors). 16ft Cable"

return the item.

clearly neither of the foot switches shown have the usual braided cable. ;-(

mherrcat

Los Angeles

Jan 30th, 2012 09:31 PM   Edit   Profile   Print Topic   Search Topic

"return the item."

Yeah, I came to that conclusion this afternoon. Hopefully the Fender foot switch will be better.

Thanks again for the help!

mherrcat

Los Angeles

Feb 15th, 2012 11:51 AM   Edit   Profile   Print Topic   Search Topic

FYI Update:

I returned the questionable switch and purchased the Fender branded equivalent. The Fender switch has none of the issues the Amplified Parts switch had.

:)

mickkotter

gretna, la

Feb 15th, 2012 02:24 PM   Edit   Profile   Print Topic   Search Topic

yeah...

florida telepicker

USA Fort Lauderdale

Dave W.
Feb 15th, 2012 07:23 PM   Edit   Profile   Print Topic   Search Topic

Ya get what ya pay fro, if your careful :)

mherrcat

Los Angeles

Mar 21st, 2012 05:47 PM   Edit   Profile   Print Topic   Search Topic

Follow-up:

I got an RMA from Amplified Parts and returned the foot switch on Feb. 6. After over a month and two more emails I have still not receive a refund (credit to my charge card) for the returned switch.

You can guess what my advice would be to anyone considering a purchase from Amplified Parts...

Next 20 Messages  

FDP Forum / Fender Amps: Vintage (before 1985) / Dual-RCA Reverb/Vibrato footswitch




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