Hammond L102 to treck preamp pedal and padding signal

[toto]

Good evening all.
After doing a full service on a Hammond L102, I would like to connect a Leslie 760 to it.
I have the Treck 2 so all I need is an output Jack socket at the back of the L102.

So far it's not too difficult (I believe), a dummy resistor across the green & black (or ground?) wires going to the speakers and a SPDT switch to kill the internal speaker and have the leslie on. Am I right so far?

I have read in posts that the signal coming out the amp is very hot.
I would like to build a pad to attenuate the signal so it doesn't arrive too hot in the treck 2.
Has anyone done that before? Would -20db be enough or should I do more?
I found this website where it explains how to make a pad:
http://www.martin-doppelbauer.de/aud...pad/index.html
Would these components mentioned in this website do the job?

Thank you all so much for your help. :->

[wayshot]

I'd skip the Trek II for this purpose and rather hook the Leslie directly to the organ with a connection kit.

[enor]

Additional preamps between a Hammond and a Leslie are never a good idea. Hook up a socket to the organ itself - it's very easy.

- - - Updated - - -

Thanks for your help Wayshot,
This is not my L102 and the person I am doing it for won't buy a connection kit I'd say. your solution sounds so easy that i'd really like to go for it but I can't.
I'm looking for a cheap solution with a bit of soldering involved that will make everyone happy! :->

You don't need a "kit". You need only the 9-pin outlet, a 10 ohm 10 watt power resistor, and a suitable speed switch.

[toto]

Good evening Enor,
I saw your previous post about this topic with your drawings.
I might hook up the leslie without the treck and put switches instead.
Is de dummy load going between the green and black amp output or between the green amp output and a hearth wire attached to the speaker? Sorry this is a stupid question...
Do you think padding the hammond is a good idea?
Thanks!

[enor]

Good evening Enor,
I saw your previous post about this topic with your drawings.
I might hook up the leslie without the treck and put switches instead.
Is de dummy load going between the green and black amp output or between the green amp output and a hearth wire attached to the speaker? Sorry this is a stupid question...
Do you think padding the hammond is a good idea?
Thanks!

The black wire from the amp _is_ a ground connection. So, the answer to your question is "both", in a sense... but install it across the speaker wires.

If you're going to connect it to a 760 - no, don't pad the signal down.

[toto]

Thanks Enor, you are great help again.
it all makes sense now. I suppose that if a dummy is putted in between the green and black wire, the amp load gets trapped in it and then we get a "normal" line out signal going to leslie. Am I correct?

[enor]

Thanks Enor, you are great help again.
it all makes sense now. I suppose that if a dummy is putted in between the green and black wire, the amp load gets trapped in it and then we get a "normal" line out signal going to leslie. Am I correct?

No, the signal will be much much hotter than a "normal" line out. But that's the way it's supposed to be, a Leslie expects such a hot signal in order to work.

[toto]

Thanks for the help,
Ill get these parts and rock on then.

[toto]

Enor,
Would a 10 ohms 12.5 watts resistor do the job or does it have to be 10 watts?
Thanks

[enor]

Enor,
Would a 10 ohms 12.5 watts resistor do the job or does it have to be 10 watts?
Thanks

10 Watts minimum - so 12.5 is fine for the job!