AO29 - going to Leslie AND 1/4" out at the same time

[bourniplus]

Hello everyone,
I've read alot about this but am still wondering. My M100 has no internal speaker, there is a load resistor instead, and the audio signal goes straight to my 147 Leslie, and it sounds great. If I add a 1/4" output according to the simple circuit that can be found on the wiki page, and use it at the same time as the Leslie -let's say, going to an effects pedal-, would this affect the signal that goes to the Leslie? Or should I add some kind of isolation transformer? I guess that's what a D.I. box would do, but the isolated output would be XLR. Thanks for any advice.

[Jaim]

Shouldn't affect anything. I use the attached for a line out.

Jim

[Sweet Pete]

Along with the relay/power supply 12V switching for my 115V AC Leslie 147 speed control system,I can simultaneously switch the Neo Vent.
One switch for both.This includes slow/stop/fast on both.
M100 can do both 147 and line out.No worries, consolidate your motor switching too! If that effect happens to be a Leslie sim.....

[tpappano]

Something to keep in mind on a M3 is that the speaker winding of the output transformer has a grounded center tap which makes the black and green wires a ‘balanced' line. I suggest that the sleeve terminal of your line out jack and bottom leg of your level pot should return to chassis ground instead of the black wire. This might prevent conflicts with other external gear. I wasted a couple of hours troubleshooting my ao29 because of low output. I had installed shiny new 3-wire line cords on the M3 and E100 and both organs connect to my 720. I had forgotten about the center taps and the new ‘ground' connections effectively were shorting half the transformer secondary, substantially reducing output 8)

[bourniplus]

I was thinking of using the lineout to go to a reverb pedal, instead of using the reverb unit I've built from the M100's parts. I couldn't help but think that the organ's output, the Leslie and the pedal would then form a new circuit, different from only organ/Leslie. I'm not concerned about speed switching for the moment, just the audio.

[tpappano]

Would you be disconnecting the Leslie's audio input from the organ and moving it to the output of the reverb pedal? I don't see why that shouldn't work. Am I assuming correctly that the pedal allows you to control how much reverb is added, etc?

[bourniplus]

No, the Leslie would still be connected to the organ. The idea is to have a wet, non-leslied reverb signal that I would send to its own P.A. channel.

[tpappano]

Ok then, the Leslie and line out jack should should work perfectly fine together.

[Jaim]

Something to keep in mind on a M3 is that the speaker winding of the output transformer has a grounded center tap which makes the black and green wires a ‘balanced' line. 8)

This only applies to early AO29's with a field coil speaker. The later models have a single ended transformer with one leg connected to ground.

I don't think I've ever worked on an early AO29, I know the OPT's are different. Thanks for the heads up.

Jim

[tpappano]

Indeed, you are correct. I flipped through the schematics to check for taps on the different versions, I flipped a little to quickly 8)

[bourniplus]

So I made a line-out using the circuit in post #2. Instead of the pot, I used a resistor. Even with a 220 ohms resistor I still have a bit of distortion and a pretty hot signal that needs to be padded on my mixer. Should I experiment with other values for the other components as well?