Expression Pedal for A100 Chop

[Trekkie]

I bought an A100 chop off eBay, and the guy I bought it from told me it came with a pedal. Well, it did. A Behringer pedal with no hook up to the organ. (lesson learned about seeking more specific answers, because long distance sellers don't always tell you everything.)

So, now I seek information on how to hook up an expression pedal on an A100 chop? (same guy also told me the organ came with a leslie cable, which it did. it just didn't come with a Leslie hookup) Now, I'm decent at playing the organ and hearing music in my head, but I'm pretty slow on the tech end. I have gleaned much wisdom from this purchase, such as rueing the day I bought a chop, and learning not to assume since they're sending you a leslie cable that it actually has, oh, let's say, a Leslie hookup and switch.

Any thoughts on what to do for an expression pedal?

[jdoc]

that would be called a Leslie Kit,and one would ask which kit and which cable , lol, what outs does the organ have? Only a Volume pedal on a line out would work, unless someone did some magic, because most Keyboard "expression" pedals don't work like that. Original pedal did "tone shaping" too....why some guys use a cable system to retain them

[Trekkie]

well, that helps a lot....

[Bradley]

AO28 or Trek2 preamp?

[Trekkie]

ao28,but it has a quarter inch line out

[Jaim]

Could you post some pics?

Jim

[enor]

Does the preamplifier still have the swell capacitor in it?

[Trekkie]

The AO28 is mounted upside down

[Jaim]

WOW - I blew up the picture and here's my take. You have a line out connected to a G and ground. The volume control looks like a total hack job on the 12BH7 tube extender. My guess is pin 7 (grid) is run through a pedal.

Note: Controlling the volume this way you lose the tone shaping circuits of the expression pedal.

I've seen chops where the tone control pot was removed and replaced with a 1/4 jack which was run through an Ernie Ball pedal modified with a 100K log pot.

Bottom line - that tube extender on the 12BH7 is scary. You could test the organ by removing the tube extender. You would have full volume.

Jim

[Jaim]

Didn't mean to scare you off.
Using a volume pedal instead of the expression pedal isn't uncommon. The are a lot of chops including some sold by national retailers that use the same method. This rig can be fixed.

What are you going to run the organ through?

Edit: Just a thought. Has anyone tried connecting a pedal to AO28 terminals E & F?

Jim

[enor]

the swell cap is still there. it's just a matter of designing a linkage.

[Trekkie]

Jim, planning to run it through a Leslie 122.

[Jaim]

You will need a Leslie 122 kit which provides a 6H connection. George Fish on his site has a nice collection of kit information. http://www.fishorgans.com/leslie_kits/

The kit has to have the speed switching circuit and provide the 6H connection. Usually an 8000 kit is used in a B3, however it is designed to connect to a 6 pin connector in the outlet box. In your case it would be nice to have the connector in the box. I've been looking around and haven't found something suitable. Tone Wheel General sells the 6122 kit but that has provisions for an internal speaker.

Being this is an A100, space would be another consideration. How much room to you have to mount a box and do you have a tremolo switch?

One other option would be to build a pedal that has the switching circuitry, speed foot switch and power cable. You could connect it to the organ using a TRS cable.

If you see a box - send a link via this thread or private message and I'll take a look.

Jim

[Tim_at_Jonas]

Linkage? You need the guy who made this: https://www.youtube.com/watch?v=n6_kJFOh4J4