Would this work? (Leslie 1/4")

[ThomasP]

Hello!

I recently got a Leslie 760 which I would like to take to some upcoming gigs.

The 760 is hooked up to my CV, which can't come to these gigs.. but I would like to run a CX3 and a Wurlitzer 200 through it (both 1/4" inputs).

I don't have a Leslie Combo Preamp (which from my understanding would make running the CX3 and Wurly a breeze), but was wondering if I could make something similar before my upcoming shows.

Is it possible to make a speed control with On/Off and Fast/Slow controls, and run it through a preamp?

I was looking at this preamp...

http://artproaudio.com/art_products/...e_mp-original/

If that is even possible, then what would I set the preamp to in order to match levels?

Could I make something similar to the Combo Preamp with 2 inputs to run both keyboards at the same time?

How would I make the leslie go from 9 pin to 1/4"?

Lots of questions...

Thanks! Thomas

[Sweet Pete]

The pin-outs of a 760 can be sorted out at the Captain Foldback website.
It is the simplest of all 9 pin Leslies to configure.
The 760 needs to see a speaker level input which is way hotter than a standard line level signal.
Many folks who use more than one 1/4" instrument at a time find a modern small practice size amp
with two or more input channels useful for its 'speaker out' to drive the input of a 760 hard enough.
I used a little Peavey Rage 258 that was a free gift....to accomplish this. And it has an FX loop...and overdrive.
The only Leslie no longer in my possession I wish I still had? The 770,wooden version of a 760.
Best sounding solid state model for Hammond I've had the pleasure of using.

As long as you are confident enough to read a schematic you'll sort it out no problem.

[enor]

The ART Tube MP is excellent for the job! I have used it before, with great results.

[Sweet Pete]

I agree with Magnus on this too. My ART Tube MP is a great little 'single' channel Leslie preamp.
When I run my Nord to my 147 it works great!
If you are running two instruments the MP is only single channel however....which is why some people
use a small 'practice' size amp.
Even better than my little Peavey? I got to use a Fender Vibro Champ once and a Fender Princeton Reverb once.
More $ but GREAT tone....

The solo on Conquistador by Procol Harum w/ESO is a Hammond B3 into a Marshall 100 Lead Head padded down to line level
with 'speaker out' to a Leslie 122......and
if that's not good enough we are all open to further suggestions!

[jdoc]

pawn shop amp will do wonders.......did it with an 11 pin 7830 kit, gave tone controls, etc.

[Sweet Pete]

pawn shop amp will do wonders.......did it with an 11 pin 7830 kit, gave tone controls, etc.

My wife Maureen came home from a dog walk toting the Peavey Rage 258. It was sitting beside the trash with a pair of 1/4" cables.....
and a Yamaha E303 'home style' 61 note midi capable keyboard.....both working and FREE.....:->

One persons garbage is anothers treasure...."Where is the music rack and battery cover?" I asked......followed by a slap upside my head :P

"Well , at least it has it's wallwart power supply".....as I apologized.

[ClavAnother]

Fwiw, the behringer MX-400 is a nice tiny, quiet 4 channel mixer that's only $25. It would work for using multiple keyboards into a single channel preamp, but for all I know, it might even have enough gain to drive the amp on its own.

If youre cosidering the ART, it would be a cheap way to add more keys.

[Wes]

it might even have enough gain to drive the amp on its own.

I don't think so. 16 dBu output = ~ 1.3Vpp; need around 5Vpp to drive a 760 to full output.

Wes

[ThomasP]

Thanks for the replies!

I was wondering if the ART would work because its only single channel... Would it be possible to run the CX3 and the Wurly into a Y-type-connector and send that signal to the ART? Or would I run into troubles? I don't play the keyboards at the same time ever, but I don't know if that affects it.

If that works then the only thing I'm stuck on is how I wire 9 Pin to 1/4"?! I dont know which pins to connect to the hot/cold 1/4" and all that. Help would be greatly appreciated!

[Sweet Pete]

Two instruments into one mono input is not going to work like one instrument 'to' a pair of inputs.

Sorry I'm not literate enough to send you the Captain Foldback link, maybe while you are waiting for this gratification
you could Google the Captain Foldback site on your own.

Like I said in the first reply , a description of the 9 pins are listed in detail on this site. Along with most other models of Leslie as well.
Us old timers find it a valuable resource....make a copy of the pinouts for yourself and start asking the RIGHT questions,you'll get there my man!

Maybe senior member Wes Garland will help you out on here, he has a 760.

[ThomasP]

Hmm so the ART might not be the best idea... Too bad

I have checked out Captain Foldback and the MOSweb and understand the pin outs for my Leslie, I just dont understand which pins I need to connect to the 1/4".

Pin 1 (Ground) to the Sleeve of the 1/4" ??
Pins 8 and 9 (AC power) to the Tip of the 1/4" ??

I'm just not sure if thats correct and don't want to get hurt/hurt my gear!

Since the ART won't work because its only single channel... I have a sweet sounding Garnet amp head. I would just have to plug both keyboards into that, and that use the Speaker out to the Leslie in order to run it at an appropriate level?

Thanks for all your help everyone.

[Wes]

oh yeah! Use the Garnet, man, sweet sweet Winnipeg tube tone to warm up your CX3 before heading for the 760.... Make sure you wire a load resistor in parallel with the 760 input to load down the Garnett and keep it from cooking its output transformer.

Wes

[ThomasP]

Would the amount of resistance I add depend on the Garnet Amp?? What level should be being sent to the 760?

[Wes]

The resistance will depend on the design's ideal speaker impedance. Don't forget to use a power resistor. At least 10W.

The level should allow about 20W to be sent into an 8 ohm load....just turn it up until it sounds right.

[clem]

Pin 1 (Ground) to the Sleeve of the 1/4" ??
Pins 8 and 9 (AC power) to the Tip of the 1/4" ??

Definitely not pins 8 or 9. Looks to me like it would be Pin 1 to sleeve for audio signal - and Pin 2 to tip for audio signal +.