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Re: How to hook a Hammond organ reverb amp/tank to an amp

10/4/2005 10:25 AM
Peter	Re: How to hook a Hammond organ reverb amp/tank to an amp Hi Glenn, you can make this work for you, but the 1st thing to understand is that these organ reverbs work in a somewhat different way than guitar amp reverbs... In a guitar amp, the signal gets split, and part of it sent to the reverb tank. Then the output of the reverb tank gets mixed back in with the original signal. Then all that gets sent to the power stage and then to the speaker. So both the direct and the delayed (reverb) sound come out of the same speaker. These organ things are designed in a way that is more of an "add-on": the speaker output from the organ goes to the speaker (of course) but is also tapped off and used to drive the reverb tank. So the 'signal input' on your box wants to see the speaker output of another amplifier. This is sent to the "driver" output (via the little circuit called "volume compressor" on your schematic). Connect the driver output to the INPUT of your reverb tank (I think you have it backwards which might be why the signal is weak). The tank output then goes into the reverb amplifier (i.e. the RCA on the side of the box). Connect a speaker to the speaker terminals: this has to be ANOTHER speaker, it can't be the same one connected to your guitar amp already. What should come out is ONLY the funny-sounding reverb tank signal, just because that's the way these things are designed to work. You could modify the circuit to mix in some of the direct signal as well. You should be able to test the amplifier by plugging a signal into the RCA on the side of the amp (i.e. where the tank output would normally get sent) and hearing it come out the speaker. I'm guessing the organ likely has a control on it to adjust the amount of signal sent to this thing... hope that's helpful!

10/4/2005 10:25 AM

Peter

Re: How to hook a Hammond organ reverb amp/tank to an amp

Hi Glenn, you can make this work for you, but the 1st thing to understand is that these organ reverbs work in a somewhat different way than guitar amp reverbs...
In a guitar amp, the signal gets split, and part of it sent to the reverb tank. Then the output of the reverb tank gets mixed back in with the original signal. Then all that gets sent to the power stage and then to the speaker. So both the direct and the delayed (reverb) sound come out of the same speaker.

These organ things are designed in a way that is more of an "add-on": the speaker output from the organ goes to the speaker (of course) but is also tapped off and used to drive the reverb tank. So the 'signal input' on your box wants to see the speaker output of another amplifier. This is sent to the "driver" output (via the little circuit called "volume compressor" on your schematic).
Connect the driver output to the INPUT of your reverb tank (I think you have it backwards which might be why the signal is weak).

The tank output then goes into the reverb amplifier (i.e. the RCA on the side of the box). Connect a speaker to the speaker terminals: this has to be ANOTHER speaker, it can't be the same one connected to your guitar amp already. What should come out is ONLY the funny-sounding reverb tank signal, just because that's the way these things are designed to work. You could modify the circuit to mix in some of the direct signal as well.

You should be able to test the amplifier by plugging a signal into the RCA on the side of the amp (i.e. where the tank output would normally get sent) and hearing it come out the speaker.

I'm guessing the organ likely has a control on it to adjust the amount of signal sent to this thing...

hope that's helpful!

Replies:

GlennW Hi Peter, and thanks a lot. I was ... -- 10/4/2005 4:02 PM