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Topic: Super Twin Reverb footswitch help desired |
Lane Gray
From:
Topeka, KS
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Posted 25 Jul 2014 10:57 am |
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Does anyone have a footswitch for these?
Fender sent me a schematic for the amp, but said the manual is lost to the mists of time.
The non-reverb model had 3 switches (but I don't recall which wire had TRS), but I suspect that the Reverb mighta used a different switch.
I can forward this schematic if someone wants it.
I'm also thinking of making a legmount switch if the switches do something useful: if they don't do things I'd like to change (I suspect I'd want reverb on, EQ on, distortion off), I'd probably just use plugs in the jacks (open or closed as suits purpose).
Does anyone have the info?
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 25 Jul 2014 11:09 am
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| Isn't this the model where you don't even get the full power (180W?) unless you have something switched on with the footswitch? (That's a very vague statement but it's all I've got in my head). |
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Lane Gray
From:
Topeka, KS
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Posted 25 Jul 2014 11:14 am
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The non-reverb did. I wanna say (won't be home til tomorrow) that the 3 switches on the non-reverb were "EQ," "Distortion" (and I've never heard a single good word said about their distortion) and "Boost".
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 11:18 am
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Lane, email me the schematic and I will figure it out for you.
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Lane Gray
From:
Topeka, KS
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Posted 25 Jul 2014 11:26 am
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Thanks, Scott. Shot you an email.
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 11:32 am
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Lane, is this the footswitch you have?
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Lane Gray
From:
Topeka, KS
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Posted 25 Jul 2014 11:45 am
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That's the one from the Super Twin (no reverb).
Does the STR use the same switch?
I would have assumed they also switched the reverb.
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 11:46 am
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Well, for some reason I haven't gotten the email yet, but I did find a schematic, and that switch pic is the correct switch.
The Distortion switch is also available on the front of the amp.
Here is how the switch would be wired...
Distortion switch to shield and ring of the TRS cable.
Boost switch to the shield and tip of TRS cable.
EQ switch to shield and tip of TS cable.
Would be really easy to make it up as a leg switch.
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 11:50 am
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You are correct Lane. Evidently they had a second switch for reverb, because I found the jack buried in the schematic. It is wired TS, separate cable.
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Lane Gray
From:
Topeka, KS
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Posted 25 Jul 2014 11:50 am
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Since I am not sure I'd WANT to switch the power level (but I may try it), I assume permanent activation would be inserting a shorted plug into the EQ jack, and a TRS plug with ring open, but sleeve and tip shorted?
And the reverb was on with nothing inserted
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Jon Light (deceased)
From:
Saugerties, NY
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Posted 25 Jul 2014 11:54 am
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Maybe you already shot this down but to repeat, I recall reading that unless you activate it via footswitch, the amp defaults to around 100 watts. The SUPER in Super Twin requires footswitch boost.
http://bb.steelguitarforum.com/viewtopic.php?t=150299 |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 11:57 am
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Here is a highlighted cut of the schematic. If you notice on the distortion jack, there is an "S1" just above it, that switch is on the back of the distortion control on the front of the amp. That switch would have to be on for the footswitch to be able to operate that function.
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 12:06 pm
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Lane, here is something in the other thread about the boost switch...
| Quote: |
| Regarding the boost function in the Super Twin Reverb, the remote foot switch does nothing more than insert a 39 Ohm resistor parallel to the 100 Ohm resistor in the negative feedback loop in the power amp. This leads to a reduction of the amount of negative feedback in the power amplifier, which in turn increases output power (as well as distortion and noise). |
I don't see the mentioned 39 ohm resistor. I do see that if the switch is on, it shorts the tip to ground. If you plan to run it in "high gear" all the time, you could make up a plug with TS shorted.
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 12:08 pm
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Additional thought, since we don't have a footswitch schematic, the 39 ohm resistor may be in the footswitch itself...
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 12:12 pm
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Yep, resistor is in the footswitch, found that on another forum.
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 12:41 pm
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So, here would be the reverse engineered footswitch schematic...
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 25 Jul 2014 2:26 pm Re: Super Twin Reverb footswitch help desired
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| Lane Gray wrote: |
Does anyone have a footswitch for these?
Fender sent me a schematic for the amp, but said the manual is lost to the mists of time. |
Yes, I have a Super Twin Reverb, and it came with two footswitches; one for just the reverb, and the other for the EQ/Dist/Boost. The rated wattage (180 RMS) is available without the boost switch on (at least, according to Fender) and I'd guess the output with the boost and distortion on, and all controls at maximum would far exceed 180 watts RMS!
cavier emptied  |
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Lane Gray
From:
Topeka, KS
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Posted 25 Jul 2014 5:06 pm
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Thanks, everyone. I do like its tone through a SICA in a Tommy Huff cab (mine's a head, not combo).
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Scott Duckworth
From:
Etowah, TN Western Foothills of the Smokies
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Posted 25 Jul 2014 11:58 pm
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Glad to help Lane. Now that I did my Session 500 Pre Amp project, I'm thinking slit cab of my Nashville 112!
_________________
Amateur Radio Operator NA4IT (Extra)
http://www.qsl.net/na4it
I may, in fact, be nuts. However, I am screwed onto the right bolt... Jesus! |
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