Northern Hammond CV - vibrato/chorus type?

[Guest]

I've been looking online for a detailed description of how the CV's chorus / vibrato funtions but I cant seem to find any info on it.</p>

One friend of mine suggested that there was as additional tone wheel section inside the CV that was used to create the chorus effect but at a glance, it looks like just a slightly larger grey vibrato unit.</p>

Anybody know the scoop?</p>

cheers,</p>

D </p>

BTW-in a previous post I mentioned that this CV had an aftermarket speaker system added to it. It appears that it was built from the guts of a Northern Hammond tone cabinet. There was also an older style reverb unit that appears to be of the oil filled variety...
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[redoctoberff]

Re: Northern Hammond CV - vibrato/chorus type?



I'm pretty sure the M/CV vibrato line box (large, silver, wooden) is functionally the same as that of other scanner vibrato equipped Hammonds, just with bigger parts. Specifically, the inductors that make up the delay line are big, waxy, paper/cloth looking things that take up a lot of space. </p>

You can see the line box in my (still) unfinished chop in this picture--it's big, but sounds the same as my M3's to my ears.</p>

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Stefan Vorkoetter, a member here (stefanv) rehauled the vibrato on his M100 and explains quite comprehensively on his website how the Hammond vibrato system works. You can find it here: http://www.stefanv.com/electronics/h...brato_mod.html
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[redoctoberff]

Re: Northern Hammond CV - vibrato/chorus type?

Oh--also, your friend is thinking of the BC, which predated the scanner vibrato (V, 2 and 3) models and *did* have a separate generator, called the chorus generator, for pitch-shifted tones. I've never heard one but I bet they sound awesome.

[Guest]

Re: Northern Hammond CV - vibrato/chorus type?



Silly me. I just looked a little closer behind the preamp section &amp; of course its a scanner vibrato in there.</p>

So all I really need to do now is add percussion and a leslie kit.</p>

Super cool that your making an M3 chop! I use one in my R&amp;B band and it sounds fatter than any hammond clone could. Players who say they'll only play an A100/B3/C3 or console are seriously missing out on some great spinet organs...
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cheers,</p>

D
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[redoctoberff]

Re: Northern Hammond CV - vibrato/chorus type?

[quote user="funkyd307"]

Super cool that your making an M3 chop! I use one in my R&amp;B band and it sounds fatter than any hammond clone could. Players who say they'll only play an A100/B3/C3 or console are seriously missing out on some great spinet organs...
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[/quote]</p>

Amen. This project has been quite a while in the making--I'm currently trying to get a DIY Leslie done first (priorities--we can put a keyboard through a Leslie!) but then I'll be back to the chop cab, mainly trying to figure out the spacing within the cabinet, then spray painting the interior (black), routing all the edges, then tolex, amp corners, etc. It's a pretty time consuming project, but once this is is all said and done it'll have built in LED overdrive, variable vib/chorus (the mix, not the speed... sadly), variable perc volume, manual tapering, foldback someday, and FX loops for each manual so I can put an octave pedal on the lower, and have bass. In other words, it's going to take forever. Have I mentioned it's also an M? Original M, which means I'm adding percussion and *maybe* selective vibrato, with an M100 amplifier and M3 matching transformer. </p>

One step at a time...</p>

Anyway, the point is that I will hopefully by the end of this have a portable, "lightweight" Hammond with most of the sound, if not the range, of a console. The way I see it, unless you're playing jazz, you don't *really* need 61 keys to get "the sound," especially not for what you'd hear in a rock band. The right drawbar settings, a little bit of growl, and a Leslie are just about all you need. If I do ever find myself a cheap console, I think that would be my home organ, and I would still prefer to gig with the chop...
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[Guest]

Re: Northern Hammond CV - vibrato/chorus type?



There are so many cool things going on with your chop! I've used the boss super octave (polyphonic) pedal on my M3 with very satisfying results so I can imagine how cool yours is gonna sound.Right now I'm kinda in a similar place in my life: in the midst of slowly building the ultimate M-series live rig. I'm adapting a version of a "B3 look alike" chop design for M-series (mentioned on the forum) which I bought off ebay. My adaptations to the design will include a closing / locking lid and a top half (roughly the size of yours) that splits from the bottom (4 legs on 4 heavy duty locking wheels) half so I can take it in smaller vehicles and up flights of stairs. Instead of a tolex or paint finish, I'm going to try a company called Rhino Liner that does any color of truck bed liner protective coatings.I'll probably go with either black, white or red wine/burgundy for the color...</p>

I'm better at cabinet work than electronics so I'll be reading any posts about your chop as it progresses to pick up any knowledge I can...</p>

Best of luck to you and your cool M chop!
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Cheers,</p>

D
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[redoctoberff]

Re: Northern Hammond CV - vibrato/chorus type?



Thanks! It sounds like we have the same idea going with the M rig. I wish I had a super strong bottom half, but for the time being I'm going to use two thick sturdy table legs I have (think restaurant table--the kind with one central support--I got these for free at a rummage sale) or my friend's heavy duty Z style keyboard stand. The legs would be detachable using bolts. </p>

I'm excited to hear how yours progresses. I just looked up the Rhino Linings stuff--that's awesome! It's like the tolex idea but taken to a whole new level, with the emphasis on durability. Talk about an indestructible chop. Wine red would look cool, and black is the classic look. I almost think it's better to cover a chop anyway since they aren't going to look like normal wood cabinets when you're done. I really want to see how the B3 look alike thing happens. I'm putting a folding/locking top on mine as well but it will be squarish.</p>

Good to hear about the super octave pedal... it's one of those things that *could* work, but might not, and it's nice to know you have had positive results. I do worry about there being enough signal level if you're taking it at the matching transformer rather than the speaker output, but I figure it can't be *that* much lower than a guitar output... I'll have to find a way to experiment. If you have questions about the electronics I'll be sure to answer them as I find answers! I have most of the mods pretty well planned out... it's just a process of finding which specific places to modify (i.e. what resistor sets the vibrato chorus and percussion volumes, etc.) and getting it all done. It's taken so long to get where I am now--finished cab, have all the guts and parts, etc--that I'm sure this project will still be a while in the making.</p>

If you have any suggestions for how to do the Leslie cabinet--I have the box built, but not finished--I'd love to hear them. This is really my first attempt at any sort of real woodworking...
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