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Post subject: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedback.
Posted: Sun May 29, 2011 12:43 pm
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Bought a new old stock left over from Best Buy for a cheap enough price.
Sounded pretty good in the store, of coarse thier was like five other guitar
player's checking out gear also, lots of noise. I get the amp home plug it in
and it sounds great except for a little hiss that I can put up with. Reverb set
on 4 still doing good but now I want turn the reverb and there it is at 5 and above
that howling feed back. I'll make it short. Took the reverb out, set on the table
outside the amp,turned the amp on , cranked the reverb up and stayed quiet.
I put the tank back in the amp, it started howling again. Moved the reverb a round inside the cabinet, and found the sweet spot. Looking at the back of the cabinet slide the reverb unit all the way to the left, and as close as you can get it to the edge and still get your back panel on. The plug ins for the reverb unit needs to be facing the front of the amp.
This worked for me and I saved a bunch on not having to try different tubes. I'm a hillbilly
so I come up with this theory. The reverb tank was center Right under the Vintage 30
speaker magnet. I'm thinking the pull of the magnet was pulling on the springs in the tank.
Hope this works for you to. Great little amp.


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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Sun May 29, 2011 3:59 pm
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Joined: Wed Mar 31, 2010 12:48 am
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The speaker's magnetic field likely did not cause your reverb tank to feed back.

You probably had a vibrational issue (which seems to have been addressed by relocating the tank). The tank in a vintage or re-issue amp is mounted with a piece of cardboard sandwiched between it and the bottom of the cabinet to help buffer excess vibrations from the speaker(s). Not sure how the installation in a Supersonic is configured but you might also try that for some added insurance if it isn't already mounted in this manner.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Tue Jun 07, 2011 4:16 pm
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Mine was good from the get go. Sometimes plugs need reseating to clean tarnish off. Common on any amp.

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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Mon Jun 13, 2011 8:53 pm
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I bought a used Supersonic 60 1X12 the other day and was kind of choked that I experienced the reverb HOWL at levels above 3. I found this thread and registered to share what I've found during my brief troubleshooting. I tried as one poster suggested and added a piece of thin foam under the spring box. That didn't work. I had strong suspicions that the spring box was being influenced/affected by the speaker magnet within close proximity so I found a piece of 1/4" aluminum plate (about 5" x 16" - enough to cover the top of the spring box entirely). Note: Aluminum is a none magnetic metal for any who were wondering).

I placed the alum plate on top of the spring box inside the cabinet and MAGIC -- I can crank the reverb to 10 if I want and it runs like a slick dream.

Hope I've helped someone here :)

Thanks,

Dean


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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Mon Jun 13, 2011 11:00 pm
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Interesting mod, Dean. And ¼-inch aluminum sheet stock is some serious shielding!

Good tip. And welcome to the forum.

8)

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Tue Jun 14, 2011 8:18 am
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I'll bet that it is just the weight of the piece of aluminum acting as a damper against vibration. After all, the reverb tank is made of aluminum already, plenty thick enough for great shielding. You might get the same results by putting a rock of similar weight on the tank. It would be interesting to try other materials and see if it isn't simply a problem of vibration. The tank should not be solidly mounted to the cab either. :idea:

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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Tue Jun 14, 2011 10:35 am
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I had a Stage 160 do that and the only thing that would help was to wrap the tanks with bubble wrap. I wanted to try a new tank to see if that would help.


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Post subject: Re: Fender !st Edition Super-Sonic 60 W. Amp. Reverb Feedbac
Posted: Mon Mar 12, 2012 9:06 am
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Found this forum when researching the same problem with my new SS 60. After reading Dean's post about shielding the reverb tank with aluminum to prevent interference from the speaker magnet I thought I'd try a similar solution. Another member posted that the reverb tank was already aluminum so it shouldn't react to the magnet. I thought I'd try a shield anyway. As I was removing the reverb tank from the amp it stuck to the speaker magnet like glue. Although the tank looks like aluminum it must not be since it attaches itself to the magnet even through the vinyl tank bag. Since I didn't have a thick aluminum plate like Dean had I fabricated a shield using a foam type shelf liner material and heavy duty aluminum foilanadromous a piece of cardboard cut to the size of the reverb tank. First I doubled up the rubber shelf liner then put down the aluminum foil that I had folded over into 5 or 6 layers. I then folded another doubled up layer of the shelf liner creating a rubberized aluminum sandwich, so to speak, that I laid on top of the tank. I used a piece of cardboard on top of the "sandwhich" just to make it easier to slide the tank back into bag. Before remounting the bag I held it up to the speaker magnet and found only a slight magnetic attraction. I remounted the bag and powered up the amp. Problem solved! I can turn the reverb up to 10 with no hint of feed back at all. It's an easy mod and worth a try (IMHO) if you're getting feedback at low settings from your SS 60.


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