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Post subject: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 6:31 am
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Hi all,

I'm new here, so hi to all! :)

Just got my new Fender Super Sonic Twin 100W amp, actually this is the second one as the first one had issues with the FX loop, lots of buzz and noise.

But to my deception, the new one has the same problem, I mean, the amp sounds killer, but as soon as you put a simple small cable or multi FX into the fx loop, the amp produces a lot of buzz and noise, so impossible to use, as this is the second amp now, I wonder if this is normal ? I ended up using the preamp out and Power amp in feature to get my FX working, but am a little disappointing that an amp of this price has worse FX loops then a small 400$ amp ?

I'p not sure if I'll keep the amp as this bothers me a lot, but if any of you have some help on this , this would be highly appreciated.

thanks so much,

best regards,

Hans


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 10:15 am
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Sounds like the socket contacts are dirty. A squirt of contact cleaner should fix it. I had the same problem with my twin and AC30.


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 10:48 am
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My twin is dead quiet through the FX Loop. Have you tried just looping the "fx out" to "fx in" on the amp, to rule out your fx chain on your external effects, I doubt its a connector issue if it is the second amp with the same problem.

When testing, turn the reverb off as that can be very hissy (white noise) from factory setup, use your shipped pedal to do this.

Also don't sit within 2 meters of your amp when testing as those big transformers inside of it induce alot of noise/buzz onto your guitar pickups.

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Last edited by AaronK on Sat Jul 20, 2013 10:52 am, edited 1 time in total.

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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 10:51 am
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finger picking willy wrote:
Sounds like the socket contacts are dirty. A squirt of contact cleaner should fix it. I had the same problem with my twin and AC30.



Two NEWS Super Sonic with dirty contact !!!!

Or new amp in the family not new from the store ?

hansvaneven ,I 'm sure you use the proper shielded wire, don't you ? :wink:


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 11:11 am
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Thanks guys for your answers, that's cool and fast :)

I don't think it's a contact issue either after being the second amp, and yes they were both new from factory, I send the first one back because I thought it was an issue that important the noise and buz was.

I use very high quality cables, and also tested with a small cable to loop without FX, just the cable, always same issue. Then I found this forum and I read I'm not the only one having issues with the FX loops on the prosonic amps, seems that the preamp out power amp in solution is the only for me now.

Yes the spring reverb is quite noisy too, so turned it back down, btw, strange that the reverb still generates noise when the reverb is off on the footswitch when turning the knob up to max ???

Anyway, I love the sound, but hate the noise, and the FX loop is impossible to use for me now, even when sitting back two meters. Seriously, I've been playing guitar for more then 30 years, doing demonstrations and designing guitars for Washburn from time to time (http://www.youtube.com/hansvaneven), and had a bunch of tube amps in the past, so I'm not new to this. I really wanted a real Fender amp especially for the nice clean and crunchy sounds, and really like it, just don't understand why there is so much noise on the FX loop ?

thanks again guys for your help, this is really cool :)

peace,

Hans


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 11:31 am
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Bad desing on this amp ?


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 11:51 am
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Seriously, I have the impression that yes, this is bad design, or maybe a bad serie, but with so many others having trouble with the FX loops ... what's strange, is that the preamp out power amp in loops works fine, so why making an additional FX loops that doesn't work ?

thanks ;)

Hans


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 12:28 pm
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hansvaneven wrote:
Seriously, I have the impression that yes, this is bad design, or maybe a bad serie, but with so many others having trouble with the FX loops ... what's strange, is that the preamp out power amp in loops works fine, so why making an additional FX loops that doesn't work ?

thanks ;)

Hans



Yes Hans , very strange . Whar are you doing now ? Return to the store ?

Louis


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 12:44 pm
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Hi Louis,

no I'm going to keep it, the first amp went back for repair and came back even more broken due to transport, but hope to find a solution for it here ... maybe Fender has a solution or others with the same issue ? I wonder if some have a quit FX loop here ?

Sad for a 2250€ amp but hence I guess today this is what we pay for ...

thanks,

Hans


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 12:55 pm
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2250 euros !! Lots of money .

You live in Europe .


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 1:07 pm
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Yes sir, in France :) Well that's the public price, I had it a little less of course ;)


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 1:57 pm
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The noise in the effects loop just might be from a noisy tube, V7 and/or V8. Try a known good 12AX7 in V7, and if the noise is still present, replace the original tube in V7 and try the new tube in V8. You might have to replace both tubes just to confirm.

Same thing for the reverb, V5 is a 12AT7, and V6 is a 12AX7.

Not always the case, but many times the tubes can be the cause of noise.

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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sat Jul 20, 2013 11:02 pm
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To be honest this is the first real issue I have noticed someone really having with the TWIN, and it is not unlikely as every amp series and manufacturer has them, but don't put the twin in the same league as the SS22 or even the SS60 because however similar are made very differently and I am almost certain this issue is not a design issue. PCB layouts are not the same and niether is the circuits.

Opinions aside, have you tried swapping tubes as Shimmilou has suggested, as a bad seated tube might be the issue, or a bad tube.

The FX Loop allows you to have external effects before the reverb and the pre-amp out allows you to have effects after the reverb or feed signal into another system. The FX loop on the TWIN is a VALVE circuit and on the SS22 it is a OP-AMP IC circuit so the issues are not the same. The Pre-amp-Out / Power-In on all SS amps is OP-AMP circuits.

Have you tried feeding FX-Out direct into Power-In? This will illiminate a part of the circuit as the peroblem.

On a side note, for the reverb HISS, I replaced the tubes and put in good quality reverb cables and the HISS is drastically reduced.

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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sun Jul 21, 2013 4:03 am
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Thanks shimmilou and AaronK,

now how do you check which is V7 or V8 ?

It's strange that on two same amps the same problem occured, also the first amp had been repaired and all tubes had been replaced, with the same issue, actually worse, hence the reason they took it back and replaced with this new one ... is there a customer service in the US I can contact directly and check with them what might be the culprit ?

Although you are right that both amps are different, I find it strange that the issue is quite similar on both amps, for some reason I can't do what you suggest, so from FX send to Power amp in doesn't produce any sound here ? Did I forgot something ?

Thanks again guys, seems ok though to use the preamp out and power amp in as FX, as this is what exists on other tube amps, but from some tests this is the first amp that doesn't support the 4CM method with a multi FX, not that it is important, but just tried that yesterday and for some reason it didn't work well.

best,

Hans


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Post subject: Re: Super Sonic Twin 100W FX loops noise issues
Posted: Sun Jul 21, 2013 4:04 am
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Thanks for the idea on the good quality cables for the reverb unit, will sure replace those to check, seems indeed that the big transformers influence quite a lot of things on the noise side, so best to keep everything connected with high quality cables.

Hans


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