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Post subject: Supersonic 100 Head down...bias control failure reverb noise
Posted: Sat Mar 24, 2012 11:37 pm
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Hi,

I got a supersonic 100 head working and suddenly when i wanted to plau it yesterday, the sound was very weird. I cut it down checking the cables, nothing.

When i put the power on, the automatic bias control is lighting up in a strange way : the 4 green lights to check power tubes are not working, either green , orange or red, nothing. But the 3 lights on the left dedicated to the bias control are lighting up together red, green and orange.

Broken...

A french guy said to me it's a well known issue on the supersonic head and all of them are needed to be send back to factory to change the automatic bias control center...!!!! I found nothing on that on the web, do someone can confirm what to do ??

Thanks !


Last edited by MusashiChan on Fri Apr 13, 2012 1:57 am, edited 1 time in total.

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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Sun Mar 25, 2012 12:59 am
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When hold the "up" and "down" buttons of the bias control when turing the amp on; it makes a sort of reset, the 4 valve control leds are turn on red, then orange and red again. As if the 4 valves were down (on a new amp...).

When turning off the amp again et restrat again the normal way, same problem as above, no valve control led red, orange or green, 3 others red, green orange ligthing up and amp not working...


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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Sun Mar 25, 2012 9:58 pm
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MusashiChan wrote:
Hi,

I got a supersonic 100 head working...


Hi MusashiChan,

What did you do to the amp to "get it working"?

If the amp is new, and you haven't worked on it yourself, what about warranty?

I don't know about France, but here this is not a "well known issue".

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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Mon Mar 26, 2012 12:01 am
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Sorry it's my english...i meant it worked well until the failure...
The issue is that it's coming from switzerland and i'm in france, so i'll need to send it back in another country.

Apparently, all the supersonic heads were send back to the french reparator for an issue with this automatic bias control center...


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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Wed Mar 28, 2012 8:28 am
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Hey MusachiChan,...please email our Consumer Relations Dept. at consumerrelations@fender.com and they can reach out directly to you and point you in the right direction to get your issue resolved as soon as possible.


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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Wed Mar 28, 2012 8:41 am
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groovusmaximus wrote:
Hey MusachiChan,...please email our Consumer Relations Dept. at consumerrelations@fender.com and they can reach out directly to you and point you in the right direction to get your issue resolved as soon as possible.


Thanks, Fender France already took my head in charge. The issue is well known and the bias control center will be replaced.
Hope they'll be able to handle another issue with reverb and effects loop with a big hiss on them...
Very nice sounding amp but seems to be not very reliable...


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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Wed Mar 28, 2012 6:01 pm
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MusachiChan,...we want to make sure you are taken care of. Can you tell me who your contact at Fender France is,...and we'll make sure they have what they need to adress the issues? If you'll email consumerrelations@fender.com and give us your email address we can move a bit faster. Thanks


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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Thu Mar 29, 2012 12:26 am
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groovusmaximus wrote:
MusachiChan,...we want to make sure you are taken care of. Can you tell me who your contact at Fender France is,...and we'll make sure they have what they need to adress the issues? If you'll email consumerrelations@fender.com and give us your email address we can move a bit faster. Thanks


Thanks again, email sent.
But again, Fender France took my head in charge in a perfect way, the head is in the french Fender Center and i'm sure those issues will be resolved quickly.

I was only surprised to find nothing on this on the web as it seems to be a benign but known failure. I understand it's not very good for this wonderfull head to have this exposed on the web but as fender is taking a incredible care for their customers, it's not a big deal.

Cheers and congratulations for your concern.


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Post subject: Re: Supersonic 100 Head down.... bias control failure
Posted: Fri Apr 13, 2012 1:56 am
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Hello,

Just to close the topic and to leave some information on the issues the Supersonic Head could have : the bias control center needs to be changed (or firmware updated ?) as it freezes after a 128 cycle...

The reverb has a lot of noise too, fender advice me to chance the reverb tubes and the repair center had the connectors and cables changed.
Fender France and Oxygen SAV in France have solve my problem immediately and with a lot of professionalism.
I have been surprised too to see how the Fender Customer service took my complaint seriously and have done everything to be sure that my head has been take in charge.

Thanks all and congrats for the wonderful job, this head is just amazing now !


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Post subject: Re: Supersonic 100 Head down...bias control failure reverb n
Posted: Wed Mar 05, 2014 7:12 pm
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:D i have just recently had a fender super sonic 100 head come into my workshop. I plugged in my strat and turned on the amp and sure enough I got the normal heater hum from the tubes and on top of that that enoying dzz dzz dzz dzz parasitic oscilation. I open the back of the amp and looked to see what possibly could be the issue. I did a little research on the web to see people were placing better shield cable between the tank and the amp chasis.i decided to go down that path and changed the leads to Nasa space station shielded wire, the end result was there was no improvement a waist of 8 hrs so far. i sat down in front of the amp and took some time looking at the layout , I was reminded by an old chinese master amp builder Henry in Blackheath" Its all about the wire effect he often to says" what he means is look at how the transformer flux /electromagnetic emisions effect every component of the amp chasis. It was at that moment the idea hit me the coils in the Reverb box are not orientated right and are to close to the power transformer. with a little bit of experimentation of moving the reverb box around in what limited space is available I found the sweet spot. Here it is >remove chasis out of box > remove reverb box in bag > now place reverb box to the front face with grill cloth ,note that the rca connectors should located toward the top of the timber box and the reverb box as close to the right top corner as you can fasten it with the existed tank screws > place the amp chasis back in its box > connect the existing 2 leads into the chasis RCA connectors> Now to test if you have the rca leads the right way round > plug in your speaker box > turn on amp as per normal > if no reverb > reverse the 2 reverb leads on the chasis > hey bingo wheres that damn noise gone with no extra parts.

Regards Tim mason Little Buhdda amps


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Post subject: Re: Supersonic 100 Head down...bias control failure reverb n
Posted: Mon Mar 10, 2014 2:23 pm
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Mine had same problem . it was fixed under warranty
fender knows about the problem and there is updated replacement parts
if you have one and it has not failed yet you might check into it

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Post subject: Re: Supersonic 100 Head down...bias control failure reverb n
Posted: Wed Feb 17, 2016 7:57 am
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Hello . . . I realize this is a really old thread but I'm wondering if there is any new information on the problems with the automatic bias for the Super Sonic Twin and 100. I recently purchased a used Super Sonic Twin and after two weeks of happily jamming and getting it cooking with new tubes the automatic bias control failed - same symptoms as the OP here. I expect I can get replacement parts from Fender but I'm wondering if anyone has had any good or bad experiences with long term fixes of this issue. I love the amp and would like to make it work. Any happy reports of "I've jammed on my Twin/100 for years with no issues" would be helpful too. Thanks.


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