Leslie 710

[ppeterso2]

I have a almost-NOS Leslie 710 that is in a beautiful full size cabinet and want to use it. I moved it into my storage until I could figure out what to do with it. I already have a 147 hooked to my A105 Hammond and want to add this one and use the console socket on the organ using a spare 22H amp that I have and wondered w/o hacking up the inside of this Leslie 710 would this amp squeeze in the bottom lefthand side of the 710? I figured I could hook the 22H into a traditional crossover of sorts, the 2 speed horn, 15" woofer and the four motors (might have to modify the amp for the 2 add'l motors...).

Will this work? My other option is to run the 710 as it is by obtaining all of the necessary parts.

[dspiffy]

Running a 710 with a 22H would be expensive and unecessary. The only reason to do it would be if you were converting into a 22H-- i.e. removing the rotorsonic and 15", installing a 16 ohm 15" and regular drum, etc. This takes some woodworking and lot of pricey parts.

If you want to use the 710, use it as is. You'll need the crossover for it, Trek II Trek II LC0-1A.

If you're really feeling adventurous you can do these mods:

http://www.dairiki.org/HammondWiki/Leslie710Modifications

But personally I think they are unnecessary.

[tonewheel1966]

IIRC the motor needs to be inverted too.....

[Bobmann]

I just worked on a 710 a couple weeks ago...installed a Trek crossover, removed the Rotosonic and installed a drum from a 122 and relocated the 15" speaker to be over the drum. Just a little cutting of the shelf is involved, and a little creative bracketry for the motor. I think it sounds as good as one of my 122s
All you need is the drum, pulley, and upper bearing support. I used the axle from the Rotosonic. These are always available on sleezebay...there are several on there right now. I had mine finished in a couple hours.
I did not change the motor rotation; I am sure that some will insist that there is a difference in sound, and I cannot dispute that. I just did not think that there was enough of a difference to warrant the extra work, personally. My opinion is that very few people would ever be able to tell the difference...I really can't...and that would only be if this speaker was sitting next to a counter-rotating type and one could do a A-B comparison. (ducking...;)

Bob

[tonewheel1966]

Hi Bob

The motor only needs to be inverted to allow the fitting of the 22H amp.

but..........

They do sound better going in opposite directions ;)

[dspiffy]

I just worked on a 710 a couple weeks ago...installed a Trek crossover, removed the Rotosonic and installed a drum from a 122 and relocated the 15" speaker to be over the drum. Just a little cutting of the shelf is involved, and a little creative bracketry for the motor. I think it sounds as good as one of my 122s
All you need is the drum, pulley, and upper bearing support. I used the axle from the Rotosonic. These are always available on sleezebay...there are several on there right now. I had mine finished in a couple hours.

You used the existing amps? Not sure what Trek crossover you used, but there are detailed instructions in the link I posted . . . is this what you did?

[Bobmann]

Yes, I did use the existing amps, and the LCO-1 from Trek, and changed the components as listed in that Wiki link. I think it sounds great...but then my 60 year old ears may not be able to pick up subtile differences anymore.
As I said before...I can't tell much of a difference between the 710 and any of the 122s that I have, (the 710 may be a bit brighter) although I have not hooked them thru an A-B switch so I can compare simultaneously.
For the price difference between what a 710 and 122 sells for, I would recommend giving the 710 a try.
Just my opinion.

Bob

[ppeterso2]

Thanks, it looks like I may try it out like it is. The Trek crossover isn't that expensive, but the prepacked 9pin hookup kits seem to be near $300! Looks like Dr Fishsticks has some alternatives to the $300 kit. In some sick sorta way, being a vintage guy and all, I would like to hear the Rotosonic drum--just as an experiment...

[BlueOliveB3]

Psst - rolling your own 9-pin kit is a pizza cake. A 3-position halfmoon will give you chorale-off-tremolo. Heck, a center-off toggle in a plastic Radio Shack project box is a good quick'n'dirty way to cobble a let's-see-if-I-like-this hookup. You'll need a 9-pin female socket, it wants AC power on pins 8 and 9 (insulate these with shrink tubing!), Pin 1 is ground, 2 is rotary audio (only channel you'll use once you install the LCO-1A crossover in the 710), grounding pin 6 to ground turns on tremolo, and grounding pin 7 to ground turns on chorale. Don't ground both of those at once, or both motors will try to run.

9 and 11 pin Leslies are every bit as easy as 147-type Leslies to cobble kits for.

TP

[dspiffy]

Yes, I did use the existing amps, and the LCO-1 from Trek, and changed the components as listed in that Wiki link. I think it sounds great...but then my 60 year old ears may not be able to pick up subtile differences anymore.
As I said before...I can't tell much of a difference between the 710 and any of the 122s that I have, (the 710 may be a bit brighter) although I have not hooked them thru an A-B switch so I can compare simultaneously.
For the price difference between what a 710 and 122 sells for, I would recommend giving the 710 a try.
Just my opinion.

Bob

Mike Casino on the link we are discussing, said his modded 710 sounds better than a 760. I dont see how it would sound much different than a 760 (very similar amp and drivers) but a 760 is a GREAT sounding Leslie so . . .

However, I think this series of Leslie sounds pretty good without the mod (but with the crossover). So try that first!

[Momboc]

I'm interested in the mod also. What input line signal level does a 710 require?

[Hamman]

I cant believe a 710 could be better then a 760/770. At least the 760/770 is set up properly and has more umph. I have hooked up a 710 to a B3 before w/ the active xover and its weak. IMHO. The 760/770 has that sound, when hooked to a tonewheel as being between a tonewheel and a LSI organ. ppeterso2 there are some cable "inline" plug and play xover for that 710 on ebay and or Speakeasy....you still need to figure out your speed switching WHICH you could do with your existing 147 trm. switch....should have two insulated sets of contacts in it. Becareful not to cross up your 147 trem. wires with the 710's.

[dspiffy]

I have trouble believing it too, but Mike Casino is very well respected.

[ppeterso2]

ppeterso2 there are some cable "inline" plug and play xover for that 710 on ebay and or Speakeasy.....

I saw that inline piece and emailed Speakeasy about it. They told me that I would still need the crossover and that the inline connector item would keep me from blowing the rotosonic speaker.

[Hamman]

My bad! I assumed it was doing the same thing as the xover....well then I would just buy a complete 1 box kit then!

[dspiffy]

I thought the Speakeasy thing did both too! Best to go with the Trek then.

[dspiffy]

Or you can build your own crossover, Bob S provides a schematic on his web page.

[jdoc]

01-10-2011 04:44 PM #4
Bobmann

I just worked on a 710 a couple weeks ago...installed a Trek crossover, removed the Rotosonic and installed a drum from a 122 and relocated the 15" speaker to be over the drum. Just a little cutting of the shelf is involved, and a little creative bracketry for the motor. I think it sounds as good as one of my 122s
All you need is the drum, pulley, and upper bearing support. I used the axle from the Rotosonic. These are always available on sleezebay...there are several on there right now. I had mine finished in a couple hours.
Any Pictures??????????
Thanks