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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Fri Feb 22, 2013 9:32 pm
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So, are the reverb tanks in the SS 22 solidly screwed into the cab with no rubber grommets or spacers to allow for vibration dampening?

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sat Feb 23, 2013 6:11 am
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shimmilou wrote:
So, are the reverb tanks in the SS 22 solidly screwed into the cab with no rubber grommets or spacers to allow for vibration dampening?

There are grommets/spacers, but they seem to be hard, and may not provide the dampening required. There is also a piece of cardboard (talk about cheesy) that the tank sits on inside the bag. As I mentioned in my post, I'm not 100% sure this will be the permanent fix. It's just a theory I have, was easily implemented, and initially is working.

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sat Feb 23, 2013 9:25 am
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For reference, the HRDlx also has a piece of cardboard under the reverb tank, but the tank itself is not screwed to the cab, and no reverb feedback problems. The "pleather" bag containing the reverb tank in the HRDlx is screwed to the cab which allows limited movement of the tank inside the bag. If the reverb tanks in the SS 22 are screwed to the cab, I would think that removing, or loosening the screws, and allowing the tank some movement would help tremendously with the reverb feedback problem. :idea:

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sat Feb 23, 2013 10:05 am
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shimmilou wrote:
If the reverb tanks in the SS 22 are screwed to the cab, I would think that removing, or loosening the screws, and allowing the tank some movement would help tremendously with the reverb feedback problem. :idea:


+1

A piece of 1/4" foam sandwiched between the bottom of the tank and the bag might also help the situation.

Arjay

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sat Feb 23, 2013 10:24 am
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Retroverbial wrote:
shimmilou wrote:
If the reverb tanks in the SS 22 are screwed to the cab, I would think that removing, or loosening the screws, and allowing the tank some movement would help tremendously with the reverb feedback problem. :idea:


+1

A piece of 1/4" foam sandwiched between the bottom of the tank and the bag might also help the situation.

Arjay

Shim,
The tank in the SS22 is exactly as you've described for the HRDlx...bag screwed to the cab, but the tank itself can move w/in the bag on top of the cardboard.
Arjay,
Yes, I would have preferred to use a piece of thin foam if I had it on hand, but when I decided to attempt to isolate it, the soft rubber was all I had on hand, so I gave it a try.

This morning, I gave it a test again w/ reverb to 8 or 9 and relatively high volume on the fat/cln channel. Still no feedback problem, so only time will tell. Taking it to a jam tomorrow, so we'll see if handling and jostling around in the car causes it to recur.

Thank you both for the comments and suggestions.

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sat Feb 23, 2013 10:32 am
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Good deal. Yep, soft rubber, foam, anything to isolate the tank from the cab seems like a good idea.

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sun Feb 24, 2013 2:28 am
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Hmm - so my new SS22 (with the "metal" plate fix in the reverb tank - still don't know exactly how)... anyway, the howling feedback is gone.

But the reverb hums past 3 - and the hum happens even when the reverb is switched off - crazy! And now the reverb is very weak.

The foam/rubber decoupling makes sense by the way.

I have to go back again to the store - but what I want to know is - what is the fix in the official tech note?


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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sun Feb 24, 2013 6:30 am
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mc_deli wrote:
....... but what I want to know is - what is the fix in the official tech note?

Good question. Mine was done at an authorized warranty repair center, but it was done at the time I took it in for a footswitching problem. I don't know what the fix was, but I'm assuming it was electronic in nature, because physically, the tank was just as Shimmilou described that of the HRDlx and so appeared unaltered.

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sun Feb 24, 2013 2:27 pm
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I love of the sound of the amp... and I have been bedroom playing so I understand why the overall hiss level has been annoying for people. I guess it must seem a lot less at gig/studio volume as the hiss doesn't increase much with volume at all - I am interested to compare with the Super60, Vibrochamp and Fender EC that I have.

But back to the plot.... I have to take it back to the shop but now I am wondering what I should ask them to do:

- The foot switch fix with the replacement (?) contacts sounds like a great idea if it fixes the click when changing from clean to dirty channels
- Whatever the tech note is would also seem essential to do (what is it guys!???)
- And then do I ask them to undo the "metal plate" fix as it seems to have killed the reverb and bought a new buzz - and instead use foam/rubber?
- And to replace the reverb phono cables and make sure they have a proper connection to the amp

...this list seems essential if I am not going to just give it back!

- But then it is pretty crazy that turning the reverb knob causes a pretty unpleasant hum - even if the reverb is switched off - what do I ask them to do about that - is it that abnormal generally - are all SS22s doing that?

1100 euros of prime time aggravation so far!


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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sun Feb 24, 2013 4:36 pm
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I wouldn't ask them to do anything specific, except.... FIX IT RIGHT THIS TIME!

Only Fender authorized repair centers will know what the "tech note" is for any particular fix. I can't imagine that a metal plate on the reverb tank does anything beneficial, let alone being a fix described in a tech note from Fender. Some of the info that I remember from others having their amp repaired involved the reverb cable(s), and maybe some component changes, but it's not completely clear as to everything that the fixes involved. Maybe it's time to find a better shop. :wink:

BTW, I don't buy the metal plate being "shielding" as suggested by some.

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Mon Feb 25, 2013 9:16 am
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The tech note added a couple of resistors to the reverb circuit, lessening the amount of gain hitting that circuit......as was explained to me by the tech that performed the fix to my SS22. My complaint to the tech at that time was the constant hiss pressent during low volume play. The tech note did nothing to reduce the hiss.....


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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Mon Feb 25, 2013 12:25 pm
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IM4Tone wrote:
Retroverbial wrote:
shimmilou wrote:
If the reverb tanks in the SS 22 are screwed to the cab, I would think that removing, or loosening the screws, and allowing the tank some movement would help tremendously with the reverb feedback problem. :idea:


+1

A piece of 1/4" foam sandwiched between the bottom of the tank and the bag might also help the situation.

Arjay

Shim,
The tank in the SS22 is exactly as you've described for the HRDlx...bag screwed to the cab, but the tank itself can move w/in the bag on top of the cardboard.
Arjay,
Yes, I would have preferred to use a piece of thin foam if I had it on hand, but when I decided to attempt to isolate it, the soft rubber was all I had on hand, so I gave it a try.

This morning, I gave it a test again w/ reverb to 8 or 9 and relatively high volume on the fat/cln channel. Still no feedback problem, so only time will tell. Taking it to a jam tomorrow, so we'll see if handling and jostling around in the car causes it to recur.

Thank you both for the comments and suggestions.

Tried it again this afternoon, having transported it in the car yesterday. It had plenty of chance to reposition, if repositioning might cause it to recur. Still no reverb feedback at max rvb and high volume, so I'm hoping this 'fix' along with the previous 'electronic fix' has cured it.

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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Tue Feb 26, 2013 12:14 pm
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So, I did an interesting experiment earlier. I had a 90s Twin, new EC Vibrolux, 70s Vibrochamp, 80s Super60 and a new SS22 lined up and checked them for noise levels.

The Twin and Vibrochamp had a few scratchy pots and the Vibrochamp's tremolo is a bit noisy. The Super60 is quiet until the gain on the dirty channel goes up past 5 or 6 then there is some background noise. The S60 reverb is quiet. The foot switches on the Twin and S60 (and of course the SS22) all popped a bit.

And then the SS22. More hiss at idle than everything else by a country mile. And then the reverb hum (I have extra hum past reverb on 3). And the extra noise from the fat setting. And that is with all the the knobs set to zero! My SS22 also has a scratchy clean channel volume pot after 7 (which should be fixed of course).

So yes, the SS22 is hissy. But, that said, at band/studio volume, with the reverb down, it is not the end of the world - and it sounds great. The signal to noise ratio is not killer. At bedroom level it is bad. If I had bought it for bedroom it would not keep it... but I didn't...and I want to keep it... caveat emptor


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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Tue Mar 04, 2014 5:55 pm
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I wonder if the new ones have this "fix"? Because when these first came out, alot of people were complaining about hitting surf-like reverb at 2 or 3 on the dial.... I can turn my reverb to 10 and still not have surf reverb... I also have never had any feedback issues... somewhere in-between would be nice, as I would like the reverb to be a bit stronger than it is, being a previous owner of a PRRI, which had awesome reverb.


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Post subject: Re: SuperSonic 22 reverb feedback
Posted: Sun Feb 07, 2016 9:17 am
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I'm bringing this one back up because...

my SS22 never had any of these reverb problems.... until recently.....

A few weeks ago, I noticed I was getting either reduced-intensity reverb or none at all..... this was always remedied by unplugging and re-plugging the reverb RCS cables from the amp.

But it's gotten progressively worse.

Today, I replaced the RCA cable- no help. I replace the reverb driver and recovery tubes- no help...

AND... today I have the dreaded "feedback above 5", something I have never had.... I've owned this amp a couple years now....


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