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Post subject: Supersonic 22 reverb feedback
Posted: Thu Jan 23, 2014 2:01 pm
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I have a new supersonic 22. It's a fantastic amp except turning the reverb past 3 and it will feedback or howl. I left the tank connected but removed the reverb tank from the cabinet and set it on a carpeted floor and the feedback went away. Tank is still in the bag with the cardboard under it. I then put the tank back in the cabinet and the feedback comes back..
While the tank is still in the cabinet and feeding back or howling I then pressed on the top of the tank with my hand....the feedback went away. Hmmmm... The reverb unit is feeding back due to the close proximity of the speaker magnet...the tank needs a small amount of pressure on top. The tank bag is not good enough by itself to solve the problem....I did another test of folding up an old tshirt and slid it in on top of the reverb unit still in the bag and added a piece of cardboard cut to size and slid it in the bag on top of the tshirt. Wa-La...it works...
Can turn the reverb up to 10 and no howl or feedback from the reverb....crude idea but it works! It's in the bag and no one can see it anyway. A good dense foam cut to size might be a better idea but I did not have any.
If you are having the same problem give it a shot it should work for you too.


Last edited by Mman101 on Thu Jan 23, 2014 8:39 pm, edited 1 time in total.

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Post subject: Re: Supersonic 22 reverb feedback
Posted: Thu Jan 23, 2014 2:37 pm
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I read a post same like your few months ago ...........

A microphonic tube ? tap lightly on each with chopstick and listen


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Thu Jan 23, 2014 4:01 pm
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:mrgreen: (long) First thing...i am currently just starting to go though my DRRI, but i have been in my Supersonic a lot...more on that on a later post or addendum to my original.

other than the tank quality which you state matters not in or out of the unit. I have bought two fenders since the 80's that arrived to me with "bent" tubes meaning ..they must took a poop from the factory to my house. one was a blown 6v6 early drri and the other was a PI 12ax7 pre fender purchase of GT.

There are two tubes in that puppy that surround the reverb circuit

http://support.fender.com/schematics/gu ... ematic.pdf

V3/4a V3 is a 12AT7 (driver) tap that puppy a few times with the reverb at 3-5 and the vol suit to taste - rattle? noise? sparks? or glows? i have had GREAT luck with Tung sol 12at7 ,my stash of oldies when i wanna use the

BUT the Trick IF you want to stay 12at7 and that puppy is noisy or oscillating (maybe wire dress inside also. 6201 or the cv 401(????) mullard from the tube store work great and quiet.

But like the drii and many/most fenders, when a studio engineering nubite- i learnd to roll the reverb up till you feel it unless you want a pronounced effect...now we all know dialing in reverb on fenders (or other amps) can be different amp to amp.

a lot of guys me included (retube) i did mine last night but blew it up being stupid....more on that when i post. Lucky i have mil spec RN series 1% MF all over this place INCLUDING the two 100 ohm resitors that are now black and both read a surprising 47 ohms. like i said more on that when i post.

listen if you want controllability get a 12au7 and put it in V3 NOW V4a is your run of the mill 12ax7 (mullards in mine) two REAL 7025's for the pres

now some cats yank the V4 tube and drop in 12ax7/5751/7025/ and possibly some i do not know about. BE sure to tap that pup when you tap the OTHER......

If that fixes your (OSCILLATION) cool if not it brings me to the lead dress may have changed internally due to shipping etc.

NOW shall make this really short....GO get some darn good rca to rca cables...measure the length and go buy the closet length you can (shortest) i put some nice cables (not 5.99 type) mogami's from my Nakamichi set up that isn't - nice noticeable improvement (that was done on stock tubes)

then i bought a planet waves http://www.guitarcenter.com/Planet-Wave ... 583544.154

nice improvement AFTER i buzzed the speaker...my ss22 has the spec design.

last night just as the wife came home so real testing will be tomorrow in the daytime -when musicians should be sleeping.

NW this was a quickie...done with my not blown yet and not biased yet nor hads i cahnged to gold lion 6v6s

so this amp has a new jensen ck-12 a little stiff but sounded OK- i will buzz it this weekend way outback in the garden shed.

then i plugged in my Red Jones 1 x 12 Celstion Gold...WOW amp opened up (bone stock) louder, and mucho better tone (this is the amp bottom i use most in the studio it has magic) open back with semi-exponential port

then i plugged in my VK bottom with 2 -12 Celestion Vintage 30 speakers closed back....DAMN!

The DRRI was rocking…bone stock and bias….
so back to the thread - V3, V4, rca to rca of high quality (you might treat each connector with Deoxit D / gold first.
http://www.caig.com/ read up on this - good stuff. I live on the beach and i have winds that can get up to 60ish spreading salt around and humidity....deoxit in the tube sockets, and on the pins...all my wierd problems went away with my 'wreck rocket and London.

BUT- a quick note to tube heads....so i have a couple RCA GZ34's a Sylvania, sovtek, an EH and an unknown....ALL were within a Volt (i will test ac/dc from each this weekend) and post

BUT, there may be good stuff happening at GT....because when i yanked the new DRRI GZ34....it looked exactly exactly like the RCA i have (measurements TBD on it)
BTW, have an awesome update for the SS series loop circuit…you need it only if you want a loop whose improvement is scads above that cap choked circuit. –stay tuned my minion works as fast as he can…he’s old too

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Post subject: Re: Supersonic 22 reverb feedback
Posted: Thu Jan 23, 2014 8:28 pm
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Thanks for the replies. I did the tube tap thing also during my testing but I forgot to mention it. There was no microphonics. I realize my post sounds like I want alot of reverb.
That's not the case. The reverb on my SS22 amp is not very strong for a Fender in my opinion. It needs to be around setting 4 for my taste on this amp. Other Fenders I have played setting 3 is usually enough. But when I get to setting 4 that's when the noise starts. I find it interesting that setting the tank outside the cabinet works fine even with higher than normal reverb settings but putting it back in it starts to howl again. I am not any sort of a tech. I'm that guy who takes things apart to see how it works. Sometimes I learn and sometimes "I wish I wouldn't have done that" if you know what I mean.
The SS22 is packed tight and the speaker magnet is very close to the tank as well as some of the tubes. I really like the clean channel of this amp with a good strat. It Chimes and sparkles. I like the drive channel. Some people do not. I feel you have to turn the volume up to hit the sweet spot but what tube amp do you not have to turn up to sound good.I emailed fender support several days ago and received a response today. They gave me a name of a repair center in my area. Since it's under warranty I guess I will take it in... Sorry to be long winded.


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Thu Jan 23, 2014 11:12 pm
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If you do a search here, you'll find that this problem has happened to others AND, isolation of the tank fm the cabinet has been one of the effective solutions. Deja vu :!:

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Post subject: Re: Supersonic 22 reverb feedback
Posted: Thu Jan 23, 2014 11:26 pm
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I second that, it has been covered in depth on here before.

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Post subject: Re: Supersonic 22 reverb feedback
Posted: Fri Jan 24, 2014 12:27 pm
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Spent more time today with this thing. I opened up a Mesa 5/50 Plus tank to see what was different. Besides it being screwed down to a piece of 1/8 inch plywood board, it also had some rubber weather striping stuck to the top of the tank down the center. The top needs something to dampen it for vibration. This time I cut some rubber weather striping to size. 3 pieces. 4 inch long. 1/2 inch wide and 3/8 inch deep to match what I saw on the Mesa. Ran it down the middle "- - -" I did not screw it to wood. I put it back in the bag with the cardboard that came with it and screwed the bag back in place as it was. That did the trick. It wasn't the RCA cord (which I will upgrade soon) or a bad tube (which I will upgrade those too). Played it for an hour. No Problems. The tank just needs something to dampen the vibration from the speaker. All is well now.


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Fri Jan 24, 2014 2:28 pm
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On old Fender amp ,the reverb is in the bag without cardboard but it is the bag wich is screw to the bottom of the cab , not the reverb tank . Did you reverb was like that before ?


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Fri Jan 24, 2014 4:01 pm
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The reverb tank is in the bag with a piece of cardboard instead of wood. The tank is not attached to the cardboard in any way. It's just there to absorb vibrations. This is the way it came from the factory. Fender trying to cut corners I guess. The bag is screwed to the bottom of the cabinet on each end. The Rubber weather strip on top is what it needed.
This is an awesome amp for 22 watts and I didn't want to give up on it. All the modulation pedals sound superb through the effects loop. People give this amp a bad rap but I wonder how many have played one with the speaker broken in. It took some hours of play time and now the amp is much warmer on the fat channel and crystal clean on the deluxe channel with a strat. The tone controls are on both channels are sensitive. You have to play and dial it in to your guitar. Different stroke for different folks. I'm a happy man now!


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Sat Jan 25, 2014 2:29 am
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Mman101 wrote:
The reverb tank is in the bag with a piece of cardboard instead of wood. The tank is not attached to the cardboard in any way. It's just there to absorb vibrations. This is the way it came from the factory. Fender trying to cut corners I guess. The bag is screwed to the bottom of the cabinet on each end.


All Fender amps , vintage , came from the factory with reverb like that and no cardboard or wood , just in the bag and they never feed back .


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Sat Jan 25, 2014 4:30 am
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In my experience it is not the padding or lack of that was the issue causing feedback, but the construction and assembly of the transducers within the reverb tank. Without going in to detail, the reverb beads within the tank were orientated incorrectly causing excessive sensitivity to feedback in my unit. I tried adding more padding but the feedback would come and go until I took the plunge and dabbled with the internals of the tank.

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Post subject: Re: Supersonic 22 reverb feedback
Posted: Sat Jan 25, 2014 4:42 am
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On his books , Gerald Weber suggest to put some piece of tootpiks on transducer coil to keep it tight with the reverb to have a better reveb . May be usefull for feedback ?


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Wed Feb 19, 2014 11:54 am
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Mman101 wrote:
The reverb tank is in the bag with a piece of cardboard instead of wood. The tank is not attached to the cardboard in any way. It's just there to absorb vibrations. This is the way it came from the factory. Fender trying to cut corners I guess. The bag is screwed to the bottom of the cabinet on each end. The Rubber weather strip on top is what it needed.
This is an awesome amp for 22 watts and I didn't want to give up on it. All the modulation pedals sound superb through the effects loop. People give this amp a bad rap but I wonder how many have played one with the speaker broken in. It took some hours of play time and now the amp is much warmer on the fat channel and crystal clean on the deluxe channel with a strat. The tone controls are on both channels are sensitive. You have to play and dial it in to your guitar. Different stroke for different folks. I'm a happy man now!



Change out the TL072's in the loop for either TLE2072's in a dip 8 or OPA2134's (smoother with REAL fet inputs) don't waste dough on anything better since it is a tube amp...the loop tightens up quiets down and is more musical

your loop has;
http://www.ti.com/lit/ds/symlink/tl072.pdf

i tried LME series chips in the loop in nice improvements BUT way too much overkill for a tube amps

so i went to:
http://www.ti.com/lit/ds/symlink/tle2072.pdf

here is where i am staying on this amp..matter of fact today i finish it and will l fire it up again

but i am putting these in..i have a full well equipped lab and have seen no ringing, oscillation or other common things that can occur when swapping chips..

http://www.ti.com/lit/ds/symlink/opa2134.pdf best :D :D :D :D

messing with the coupling capacitor to the PI is worth it....and since it is the same power section as a DRRI mods on the DRRI PA section apply here also - stuff like feedback, PI coupling :mrgreen:

BTW all my reverbs howl...a dude owes me dough so he is buying me new TAD versions, i am putting planet waves speaker wires in, with nice made by "bluejean cables" to length RCA gold connected shielded belden wires, i use 6201 or the CV4...somethings in the AT7 spot for the reverb drivers sometimes a JJ12dw7 in the recovery circuit...\\the ss22 is a gem too many don't know about -but i will go through my tanks now that i have read this thread - can't wait to get the TADs thou

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Post subject: Re: Supersonic 22 reverb feedback
Posted: Sun Oct 19, 2014 8:22 am
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I purchased a new Fender Supersonic 22 combo in the box never opened. Reverb feedback occurred when set above 3. Took reverb tank out of bag and turned it over. Inside the black cover is a aluminum assembly that holds the reverb springs. The aluminum assembly is suspended in air by small springs (not the two long reverb springs) that run between the black cover and the aluminum assembly. This keeps any vibrations from getting to the reverb springs that could cause feedback. In addition the back cover has four rubber grommets that rest on a piece of cardboard to also keep vibrations from going through the cover to the suspended reverb aluminum assembly inside. To keep the floating aluminum reverb assembly from moving too far and coming in contact with the back cover, there are two pins attached to the back cover that go through oversized grommets in the aluminum reverb assembly one at each end. I found that one of the pins was not in the grommet hole but stuck between the outside of the grommet and the aluminum assembly which allowed vibrations that travelled through the cabinet, cardboard, and black cover grommets to go directly to the aluminum reverb assembly causing feedback. By moving the pin inside the grommet the reverb assembly could float and this eliminated the feedback problem.

This is a quality control problem. It should have been checked out at the factory and corrected before shipment.


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Post subject: Re: Supersonic 22 reverb feedback
Posted: Sun Oct 19, 2014 8:25 am
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