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Topic: Another reverb question |
Mark Herrick
From:
Bakersfield, CA
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Posted 5 Jul 2004 3:58 pm |
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I've noticed a difference in the intensity of the reverb effect between my "Custom" Vibrasonic and my '74 Twin Reverb.
The Twin with the exact same tank seems to have a stronger reverb than the Vibrasonic. I have to put the Vibra on "7" to get the same amount of reverb that the Twin gets at "4."
Any ideas why this might be? Changing the reverb drive tube on the Vibrasonic doesn't seem to make a difference.
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 5 Jul 2004 4:11 pm
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| Hey Mark--am I correct that your Custom Vibro is not P to P wired? |
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Mark Herrick
From:
Bakersfield, CA
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Posted 6 Jul 2004 10:31 am
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That is correct. It is a PCB amp. The tube sockets, however, are mounted to the chassis, which is nice since it reduces stress on the PCB when inserting and removing tubes.
Perhaps the reverb difference is in the circuit design or trace layout?
I have also noticed a little "hiss" from the amp (Vibrasonic) when it is on. It is very slight, but it is there. I adjusted the hum balance and that helped a little. The Twin seems to be dead silent.
BTW, you'll hear a lot of people refer to amps as P-to-P wired when, in fact, they are wired on eyelet or turret boards which, technically, does not make them P-to-P wired. I think that's what can cause problems in what techs call "lead dress."
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 6 Jul 2004 11:50 am
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| Considering that the typical Fender reverb knob can rarely be set higher than 4, maybe they modified it in the later reissue to correct what I would consider a design flaw (don't shoot me, Jody). I have instructions for a mod that enables you to use more of the pot's rotation to better fine tune your reverb setting on a Fender BF amp. I intend to try it one of these days. I can email you the description if you want to see it. |
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C Dixon
From:
Duluth, GA USA
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Posted 6 Jul 2004 12:40 pm
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Jon makes a very valid point,
carl |
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Dave Van Allen
From:
Souderton, PA , US , Earth
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Posted 6 Jul 2004 4:25 pm
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| Quote: |
| Considering that the typical Fender reverb knob can rarely be set higher than 4, |
oh, Jon, they often can too be set higher; where is your sense of adventure?
Why, I myself turn mine up to, oh, I'd say, 5 occasionally!
[This message was edited by Dave Van Allen on 06 July 2004 at 05:25 PM.] |
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Mark Herrick
From:
Bakersfield, CA
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Posted 6 Jul 2004 4:38 pm
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Having only recently become a Fender amp owner, I was unaware of this aspect of the reverb control. At least I can stop wondering if there is a problem with the Vibrasonic...
Thanks!
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 6 Jul 2004 4:43 pm
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But don't listen to Dave Van Dale over there. He'll lead you to ruin. I drive 55, employ only the missionary position and keep my reverb below 4.
--Jon Flanders |
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Mark Herrick
From:
Bakersfield, CA
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Posted 6 Jul 2004 4:57 pm
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Indeedily Doodily[This message was edited by Mark Herrick on 06 July 2004 at 06:36 PM.] |
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Ken Fox
From:
Nashville GA USA
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Posted 6 Jul 2004 6:48 pm
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| The Custom Vibrasonic was based on the Blackface era amps. The Silverface amps ran the reverb drive tube a whole lot hotter than a Blackface amp. A lot of people preferred the Silverface Reverb circuit because of this. I do not change the reverb circuit when Blackfacing a Silverface amp circuit for that reason. Some of the later Silverface amps did not have a bypass cap on the reverb drive tube, resulting in a very thin sounding reverb. I have seen this in Dual Showman reverb amps. I have modified some of those back to the early Silverface amp circuits to achieve a fuller reverb tone. |
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