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Leslie Preamp pedals


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While I have your attention, I understand that the leslie slow/fast control is done by applying a DC voltage to the audio signal. How does that work?
The stock 122 (6-pin) uses a DC-controlled relay to switch Leslie motors. The switching voltage needs to change from 0V to at least 35V to switch from tremolo to chorale (or vice versa, I forget which). The balanced audio rides the switching voltage.

Does your metal box do that? I only see a foot switch in the white box which I assume is the preamp?
It switches the DC, controlled by the momentary foot switch (fast/slow/stop). There is no preamp per se. It uses a transformer.
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While I have your attention, I understand that the leslie slow/fast control is done by applying a DC voltage to the audio signal. How does that work?
The stock 122 (6-pin) uses a DC-controlled relay to switch Leslie motors. The switching voltage needs to change from 0V to at least 35V to switch from tremolo to chorale (or vice versa, I forget which). The balanced audio rides the switching voltage.

Does your metal box do that? I only see a foot switch in the white box which I assume is the preamp?
It switches the DC, controlled by the momentary foot switch (fast/slow/stop). There is no preamp per se. It uses a transformer.

 

Thank you for all the information. I think I'm going to try to make a connector box myself. And, I might even build a tube preamp now that the 300V comes for free from the Leslie. There appears to be tube preamp schemas available in the internets. I'm not sure if the preamp is really necessary, though because the clonewheel puts out line level signal.

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I'm not sure if the preamp is really necessary, though because the clonewheel puts out line level signal.

 

Yes, it's necessary. The output of a Hammond preamp is many times hotter than line level, and the leslie amp needs that level in order to deliver full power and creamy overdrive.

Moe

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