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Post subject: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:03 pm
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This weekend I was surfing around and ran across some suggestions on channel jumping the DRRI. A few guys swear by it and most comment about the two channels being 180 out of phase but I am sort of lost on how to do this properly. There is not much info out there and some might be conflicting. Just for grins, I played with it a little and noticed the out of phase thing when I used certain volume settings between the two channels. But I hit a couple of spots that really peaked my interest and I like the fact that this can give me more EQ options, and possibly mixing up V1 and V2 glass for different sounds.

But as I said, there is not much info out there, and some of it I don't trust. I read one suggestion of reversing the polarity on the patch cord on one end and I ain't too sure about that. I also read about using a A-B-Y box, but I would hate to spend $50 on one when I don't even know what it does.

And lastly, will mixing up V1 and V2 glass, give me more tweaking options?

Thanks.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:14 pm
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Simple cord between Inputs from one channel to another.
Nothing fancy.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:18 pm
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tyronne wrote:
Simple cord between Inputs from one channel to another.
Nothing fancy.


And don't worry about the phase thing, just find the sweet spots?

Lets just say I wanted the normal channel to use a master volume to OD the Vibrato channel?

Thanks man.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:22 pm
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The "NORMAL" and "VIBRATO" channels are out-of-phase with one another. This 180-degree reversal occurs at the reverb recovery stage (V4) and is common for all dual-channel reverb-equipped vintage Fender amps (and the re-issues of same). This condition may be compensated by reverse-wiring your instrument patch cable to the second channel or by using an A/B/Y switch designed to rotate the phase. The Radial Big Shot is one such device and I'm pretty sure there are others. Channel jumpering using a patch cable exacts a price in the amplitude of the signal being fed to the second channel while the gain when using an A/B/Y box remains (roughly) balanced for each of its two outputs.

HTH

Arjay

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:45 pm
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Retroverbial wrote:
The "NORMAL" and "VIBRATO" channels are out-of-phase with one another. This 180-degree reversal occurs at the reverb recovery stage (V4) and is common for all dual-channel reverb-equipped vintage Fender amps (and the re-issues of same). This condition may be compensated by reverse-wiring your instrument patch cable to the second channel or by using an A/B/Y switch designed to rotate the phase. The Radial Big Shot is one such device and I'm pretty sure there are others. Channel jumpering using a patch cable exacts a price in the amplitude of the signal being fed to the second channel while the gain when using an A/B/Y box remains (roughly) balanced for each of its two outputs.

HTH

Arjay



I stand corrected!

Thanks Arjay.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:48 pm
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Thanks guys. I'm gonna try the patch cable mod and Ill let yall know how that turns out. I'm not ready to spend another $100 on another box as of yet.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 3:55 pm
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The Radial Big Shot goes for around eighty bucks at MF, a skosh cheaper than that sometimes on Ebay (I paid $75 for mine).

Arjay

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 4:52 pm
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Well I did the patch cable mod and it sucks. The volume drop was extremely noticeable even more than Arjay noted.

Question Arjay. Should I forget about channel jumping and spending the extra money for the Radial Big Shot when I already have a MXR 10 band EQ?

Thanks brother.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 6:15 pm
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Apples and tangelos, Gary.

The two devices you mention perform entirely different tasks.

The most useful function the A/B/Y selector can provide is to give any vintage two-channel amp a true channel-switching capability. Thus, you can create two completely independent signal chains for your guitar using different stompboxes and alternative front-panel volume/EQ settings and have them available when using a single amp. And you can alternate between them "on the fly" using the footswitch feature. Alternatively, you can use this device to play a pair of amps in tandem -- great for creating some live pseudo-stereo stage effects if the amps are separated by two or three meters.

In all candor, the Radial Big Shot was the best money I ever spent on a stompbox.

HTH

Arjay

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 6:29 pm
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Retroverbial wrote:
Apples and tangelos, Gary.

The two devices you mention perform entirely different tasks.

The most useful function the A/B/Y selector can provide is to give any vintage two-channel amp a true channel-switching capability. Thus, you can create two completely independent signal chains for your guitar using different stompboxes and alternative front-panel volume/EQ settings and have them available when using a single amp. And you can alternate between them "on the fly" using the footswitch feature. Alternatively, you can use this device to play a pair of amps in tandem -- great for creating some live pseudo-stereo stage effects if the amps are separated by two or three meters.

In all candor, the Radial Big Shot was the best money I ever spent on a stompbox.

HTH

Arjay



So how do I set it up brother?

And thanks man. I owe ya a brew.

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 7:38 pm
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The Radial Big Shot has four jacks -- one designated for input, two marked as outputs ("A" and "B"), and one "always hot" output for a tuner. The unit features three slider switches: one to rotate the phase of the "B" output by 180 degrees, one to eliminate any ground loops between the outputs, and one to place an isolation transformer in line with the "B" output (the latter two functions may be needed when driving two separate amps). A footswitch is used to select the "A", "B", or "both" outputs at the player's discretion.

Fundamentally, your guitar is plugged into the input while the two outputs are routed to each channel of your amp. You can insert various effects boxes anywhere you wish -- either between your guitar and the input, behind either of the two outputs, or in any combination thereof. In other words, you'll have a ball experimenting with all the possible combinations between your guitar, your stompboxes, and your amp.

As an example, you can use one of the A/B/Y's outputs to drive a Fulltone OCD or other clean boost pedal into your "NORMAL" channel while on the "VIBRATO" channel you're pumping a Big Muff cascaded into an Octavia. The Big Shot's footswitch selects which signal chain you wish to access -- some ballsy SRV or the hair-afire Hendrix vibe. Pretty neat, huh?

HTH

Arjay

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 7:44 pm
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Everything you need to know about setting up the Big Shot ABY. I use one also.

http://www.sweetwater.com/store/detail/BigShotABY/

http://www.tonebone.com/re-bigshot-aby.htm

http://www.tonebone.com/pdfs/manual-bigshot-aby.pdf

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Post subject: Re: Channel jumping a DRRI.
Posted: Tue Aug 21, 2012 8:22 pm
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Retroverbial wrote:
Apples and tangelos, Gary.

The two devices you mention perform entirely different tasks.

The most useful function the A/B/Y selector can provide is to give any vintage two-channel amp a true channel-switching capability. Thus, you can create two completely independent signal chains for your guitar using different stompboxes and alternative front-panel volume/EQ settings and have them available when using a single amp. And you can alternate between them "on the fly" using the footswitch feature. Alternatively, you can use this device to play a pair of amps in tandem -- great for creating some live pseudo-stereo stage effects if the amps are separated by two or three meters.

In all candor, the Radial Big Shot was the best money I ever spent on a stompbox.

HTH

Arjay


Totally agree Arjay! This pedal really opens up possibilities. Funny enough, I haven't used it to switch channels on my Showman or Bandmaster, but have used it to A/B/Y between the Bandmaster and a Dr. Z Mini Z through a closed 1x12 Dr. Z cab. Once you switch to both on, it's hard to go back to playing through just one at a time...

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Post subject: Re: Channel jumping a DRRI.
Posted: Wed Aug 22, 2012 7:33 am
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I have a 1967 Bassman and I jumper the Bass channel and Normal channels together. I consider it a 'permanent' setting :lol: !

edit: it's a 67 thanks Arjay for reminding me :lol:

You get a mix of the normal guitar tone with a whole lot more bass from the bass channel. Creates a huge sound with a full range of tones. Simply the best.

I've done this with a '57 Twin as well and again absolutely loved the sound. Mix of beautiful Bright channel highs but thickened out with the sound of the normal channel.

I haven't tried with a DRRi and obviously the set up is a little different given you will have to use an A/B/Y box. But, I absolutely recommend you give it a try. Your local guitar store may have a the Radial Big Shot in stock, or a Boss LS-2 Line Selector (or a Morley, Electro Harmonix, MXR... there are a lot though some are better than others) which will accomplish the same thing. Test it out your self!


Last edited by demaria.daniel on Wed Aug 22, 2012 7:52 am, edited 1 time in total.

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Post subject: Re: Channel jumping a DRRI.
Posted: Wed Aug 22, 2012 7:44 am
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demaria.daniel wrote:
I have a 1968 Bassman and I jumper the Bass channel and Normal channels together. I consider it a 'permanent' setting :lol: !

You get a mix of the normal guitar tone with a whole lot more bass from the bass channel. Creates a huge sound with a full range of tones. Simply the best.


+1!

Years ago I used to run a '67 Bassman in that configuration, playing a '64 Gibson SG Standard with a germanium Vox Tone Bender. The cab was a modified big-box Bassman with a quartet of Utah 12's. That rig nailed Clapton's "Live Cream - Vol II" tone perfectly.

Arjay

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