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Post subject: Fender Twin Big Problems
Posted: Mon Nov 22, 2010 2:17 pm
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I have a Twin I bought in 1990... I have 2 issues....

A...I have a hole in one of my speakers in the back that took a cymbal holder during a move...its about a square inch... what will this do to my sound as I really can't notice a difference.... how can i repair it myself?

B...This amp has been worked hard for years, been taken in lots for cleaning, fixing, but no one has been able to correct an issue with my reverb... every time and again while i am high/low volume, playing with reverb, something happens that creates a sound that can only be discribed as a bomb going off in a spring factory.... 3 shops/techs could not fix....at a loss...

thanks to any advice...

Billy


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Posted: Mon Nov 22, 2010 2:23 pm
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Some silicon gel might be used to repair the torn speaker cone (use as sparingly as possible).

The reverb issue sounds like a problem with the springs within the tank itself.

HTH

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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Posted: Mon Nov 22, 2010 4:37 pm
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Maybe theres a faulty pickup inside the reverb tank, thats causing some noise.

Swap it for a similar large pan reverb tank and see if the problem persists

As for the speaker, if you dont notice a difference and you still enjoy the tone then leave it alone! If it does fail on you during a gig, well you still have the speaker on the other side so you can still get some sound!

If it does bother you that much, either get a direct replacement or think about the tone you'd like to add to your sonic capability then ask us here at this beautiful forum for that spec and we'll direct you to the nearest thing.

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Posted: Mon Nov 22, 2010 4:59 pm
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How is the reverb tank placed in the cabinet? Is it in a tank pouch with a wooden base at the bottom? I've seen some amps that had its tank actually screwed to the bottom of the cab. It makes for a great reverb tone... but also makes the amp succeptible to feedback and tank "crash."

If you like the tone and the tank is screwed to the cab... try placing a rubber grommet between the tank and the cab, which the attaching screw passing through. LIGHTLY cinched down the tank. Over-tightening can torque the tank's frame and cause other problems.

Check all connections. The RCA IC line may have a loose outer contact. Just pinch it a tad, with your fingers to tighten it. I like to clean & use contact cleaner on all electric contact parts. Just a tiny bit will do the job. And clean the socket and pins of the 12AT7 driver tube.

HTH. And good luck with your amp!


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Posted: Tue Nov 23, 2010 2:23 am
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BMW2002Ti wrote:
How is the reverb tank placed in the cabinet? Is it in a tank pouch with a wooden base at the bottom? I've seen some amps that had its tank actually screwed to the bottom of the cab. It makes for a great reverb tone... but also makes the amp succeptible to feedback and tank "crash."

If you like the tone and the tank is screwed to the cab... try placing a rubber grommet between the tank and the cab, which the attaching screw passing through. LIGHTLY cinched down the tank. Over-tightening can torque the tank's frame and cause other problems.

Check all connections. The RCA IC line may have a loose outer contact. Just pinch it a tad, with your fingers to tighten it. I like to clean & use contact cleaner on all electric contact parts. Just a tiny bit will do the job. And clean the socket and pins of the 12AT7 driver tube.

HTH. And good luck with your amp!


Great Call BMW2002Ti,

I had the same problems with my new 2010 Fender Pro Tube Twin Amp that was displaying the same symptoms as the Reverb on Billyboycott's amp.

My Qualified Fender Amp Tech did exactly what you suggest here, I had this problem about 3 weeks ago, now I have no problems.
I think the reverb sounds a lot more true now that the tank is suspended on rubber gromets..

Great call, by the way are you an amp tech :P


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Post subject: Re: Fender Twin Big Problems
Posted: Thu Mar 31, 2011 11:54 pm
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Thanks for the advice.....it did the trick.... there's something about playing a Strat through a Twin that is awesome...cheers to all!!!!


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