Fender Twin Reverb

JoshHeartless

Joined: Jun 17, 2006
Posts: 1010
Bay City, Michigan
United States

Posted on Oct 22 2006 10:18 PM

Does anyone know why the reverb in the fender twin reverb sounds so good? Is it because of the length of the reverb tank? Or does it have something to do with the tightness of the springs? Or is it just because it's a twin reverb?

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SurfCat

Joined: Oct 04, 2006
Posts: 64

Posted on Oct 23 2006 01:05 AM

Does anyone know if the Twin Reverb has a reverb circuit by AccutronicsÂ®?

If so, any info on the reverb model number?

SurfCat

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WR

Joined: Feb 27, 2006
Posts: 3832
netherlands
2 Link Pins

Posted on Oct 23 2006 01:18 AM

Hearteater
Does anyone know why the reverb in the fender twin reverb sounds so good?

but it doesn't, in comparison with a tank!

sorry had to say that ... it does sound good, just as good as any vintage Fender's reverb. it's pretty much all the same circuit, a 12AX7 tube driving a long 4 spring tray. there's a lot of other amps that use a tubedriven reverb circuit with the same tray and I'd think they'd sound equally good, that's what I get form people that actually know these amps. but solid state driven reverbs sound bad compared to the tube driven (for surf that is).

WR

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bots

Joined: Jul 05, 2006
Posts: 290
Shwa City

Posted on Oct 23 2006 01:21 AM

Hearteater
Does anyone know why the reverb in the fender twin reverb sounds so good? Is it because of the length of the reverb tank? Or does it have something to do with the tightness of the springs? Or is it just because it's a twin reverb?

Are you speaking of the current fender twin reverb or a vintage one? I've been really unimpressed with the current reverb on the new fender amps. It could also be me being spoiled with an external drip tank.

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JoshHeartless

Joined: Jun 17, 2006
Posts: 1010
Bay City, Michigan
United States

Posted on Oct 23 2006 11:38 AM

well, im kind of asking if i stretch out my springs in my current reverb circuit, if it would make it sound better. it sounds to me that the springs in a twiun reverb must pretty loose.

ive also heard that a twin reverb has 2 reverb circuits, is this true?

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PhatTele

Joined: Jun 05, 2006
Posts: 445

Posted on Oct 23 2006 12:29 PM

The Twin Reverb is essentially the same thing as a Deluxe Reverb, Vibrolux Reverb, Pro Reverb, Bandmaster Reverb, and Super Reverb. The main circuit board topology and preamp tube compliment (which includes the reverb on one channel) are the same. It's called the AB763 circuit. Here's a great link showing the circuits for all of these amps:

http://www.ampwares.com/ffg/index.html

The tanks used in all of these amps (and the little ole Princeton Reverb) are the same (2-spring...or 4 springs tied into two strands...Accutronics model #4AB3C1B).

For whatever reason, some tanks sound better than others. It's just the luck of the draw. Also, I happen to think that the old ones (late 70s and earlier) sound better than the brand new ones. I'm not sure why, but the new ones I buy sound "plinky" when compared to an old one in the same amp.

3-spring tanks...or 6 springs tied together into three strands...Accutronic model #9AB3C1B have that great older tone. However, you need a dwell control to be able to tame them.

Finally, don't "stretch out" your springs. They'll just flop around in the pan and will sound like crap if they make any sound at all.

Last edited: Oct 23, 2006 12:32:42

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surfneptune

Joined: Mar 16, 2006
Posts: 923
3 News Pins

Posted on Oct 23 2006 12:32 PM

Correct me if I am wrong, but reverb in the combos is voiced internally, as opposed to having a tone knob, you have a resister (Sp) set at one setting, same with the dwell, you can have a tech change it around to dial it in.

I have to say that I like the reverb from my old deluxe better than any tank I have had.

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PhatTele

Joined: Jun 05, 2006
Posts: 445

Posted on Oct 23 2006 12:35 PM

Yes. There is a 1M resister which controls the dwell. It's a fixed value which you can replace with a 1M pot. I've done this in a couple of project amps where I'm using a 3-spring tank. It works great.

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WR

Joined: Feb 27, 2006
Posts: 3832
netherlands
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Posted on Oct 23 2006 01:48 PM

to the original posters: what exactly do you mean by reverb circuit, cause it seems your talking about the tray,

fwiw, terms used seem to overlap, since 'tank' is used for bothe the "fender reverb unit" (the entire effect box) and for the accutronics pan holding the springs, "unit' is used for the Fender box as well as the pan, and the pan is also reffered to as "tray". I dont get it either

WR

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JoshHeartless

Joined: Jun 17, 2006
Posts: 1010
Bay City, Michigan
United States

Posted on Oct 23 2006 02:11 PM

yes, i mean the tray. sorry about unclarity.

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JoshHeartless Joined: Jun 17, 2006 Posts: 1010 Bay City, Michigan	Posted on Oct 22 2006 10:18 PM Does anyone know why the reverb in the fender twin reverb sounds so good? Is it because of the length of the reverb tank? Or does it have something to do with the tightness of the springs? Or is it just because it's a twin reverb? — The Tremblors on Facebook! The Tremblors on MySpace! Top
SurfCat Joined: Oct 04, 2006 Posts: 64	Posted on Oct 23 2006 01:05 AM Does anyone know if the Twin Reverb has a reverb circuit by AccutronicsÂ®? If so, any info on the reverb model number? SurfCat Top
WR Joined: Feb 27, 2006 Posts: 3832 netherlands	Posted on Oct 23 2006 01:18 AM Hearteater Does anyone know why the reverb in the fender twin reverb sounds so good? but it doesn't, in comparison with a tank! sorry had to say that ... it does sound good, just as good as any vintage Fender's reverb. it's pretty much all the same circuit, a 12AX7 tube driving a long 4 spring tray. there's a lot of other amps that use a tubedriven reverb circuit with the same tray and I'd think they'd sound equally good, that's what I get form people that actually know these amps. but solid state driven reverbs sound bad compared to the tube driven (for surf that is). WR — Rules to live by #314: "When in Italy, if the menu says something's grilled, don't assume it is." https://www.facebook.com/The-Malbehavers-286429584796173/ Top
bots Joined: Jul 05, 2006 Posts: 290 Shwa City	Posted on Oct 23 2006 01:21 AM Hearteater Does anyone know why the reverb in the fender twin reverb sounds so good? Is it because of the length of the reverb tank? Or does it have something to do with the tightness of the springs? Or is it just because it's a twin reverb? Are you speaking of the current fender twin reverb or a vintage one? I've been really unimpressed with the current reverb on the new fender amps. It could also be me being spoiled with an external drip tank. — www.myspace.com/vondrats www.myspace.com/therobotssurfband Top
JoshHeartless Joined: Jun 17, 2006 Posts: 1010 Bay City, Michigan	Posted on Oct 23 2006 11:38 AM well, im kind of asking if i stretch out my springs in my current reverb circuit, if it would make it sound better. it sounds to me that the springs in a twiun reverb must pretty loose. ive also heard that a twin reverb has 2 reverb circuits, is this true? — The Tremblors on Facebook! The Tremblors on MySpace! Top
PhatTele Joined: Jun 05, 2006 Posts: 445	Posted on Oct 23 2006 12:29 PM The Twin Reverb is essentially the same thing as a Deluxe Reverb, Vibrolux Reverb, Pro Reverb, Bandmaster Reverb, and Super Reverb. The main circuit board topology and preamp tube compliment (which includes the reverb on one channel) are the same. It's called the AB763 circuit. Here's a great link showing the circuits for all of these amps: http://www.ampwares.com/ffg/index.html The tanks used in all of these amps (and the little ole Princeton Reverb) are the same (2-spring...or 4 springs tied into two strands...Accutronics model #4AB3C1B). For whatever reason, some tanks sound better than others. It's just the luck of the draw. Also, I happen to think that the old ones (late 70s and earlier) sound better than the brand new ones. I'm not sure why, but the new ones I buy sound "plinky" when compared to an old one in the same amp. 3-spring tanks...or 6 springs tied together into three strands...Accutronic model #9AB3C1B have that great older tone. However, you need a dwell control to be able to tame them. Finally, don't "stretch out" your springs. They'll just flop around in the pan and will sound like crap if they make any sound at all. Last edited: Oct 23, 2006 12:32:42 Top
surfneptune Joined: Mar 16, 2006 Posts: 923	Posted on Oct 23 2006 12:32 PM Correct me if I am wrong, but reverb in the combos is voiced internally, as opposed to having a tone knob, you have a resister (Sp) set at one setting, same with the dwell, you can have a tech change it around to dial it in. I have to say that I like the reverb from my old deluxe better than any tank I have had. — THe NEpTuNeS Top
PhatTele Joined: Jun 05, 2006 Posts: 445	Posted on Oct 23 2006 12:35 PM Yes. There is a 1M resister which controls the dwell. It's a fixed value which you can replace with a 1M pot. I've done this in a couple of project amps where I'm using a 3-spring tank. It works great. Top
WR Joined: Feb 27, 2006 Posts: 3832 netherlands	Posted on Oct 23 2006 01:48 PM to the original posters: what exactly do you mean by reverb circuit, cause it seems your talking about the tray, fwiw, terms used seem to overlap, since 'tank' is used for bothe the "fender reverb unit" (the entire effect box) and for the accutronics pan holding the springs, "unit' is used for the Fender box as well as the pan, and the pan is also reffered to as "tray". I dont get it either WR — Rules to live by #314: "When in Italy, if the menu says something's grilled, don't assume it is." https://www.facebook.com/The-Malbehavers-286429584796173/ Top
JoshHeartless Joined: Jun 17, 2006 Posts: 1010 Bay City, Michigan	Posted on Oct 23 2006 02:11 PM yes, i mean the tray. sorry about unclarity. — The Tremblors on Facebook! The Tremblors on MySpace! Top

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Fender Twin Reverb