I assume this Leslie has single speed motors? There is no switching tube present so I further assume a speed controller under the chassis?
I wonder if you are hearing the pulsing that speed controllers make at slow speed. You could try unplugging one motor at a time to see if the noise goes away. If it does then this test will also indicate which motor/rotor is making the noise.
I was wondering tonite about the missing tube, which I just noticed LOL
I have not opened the cabinet yet, but have been playing a bit.
The thump does not really bother me, I just want to see if it's something I should fix.
Sometimes if I am switching alot, I will loose sound from the speaker. If I restart the RT3 it comes back.
Shining a light inside tonite I noticed the lower rotor looks new.
It will go to very loud volume with all bars out, and I worry I might be over driving. I watched Dr Kemp adjust the pedal switch to protect a leslie amp and wondered if I should do the same. You hear it when the organ is not producing sound, but not with a note. It's still happening I'd guess, but it's just not loud enough to break on through.
This document shows how to install our 2-speed controller for the 22H. More importantly, it also contains info on how to reduce noise with motor/rotor adjustments associated with electronic motor control.
It will go to very loud volume with all bars out, and I worry I might be over driving. I watched Dr Kemp adjust the pedal switch to protect a leslie amp and wondered if I should do the same.
Kemp's PhD is in psychology, not electronics. I also happen to have a PhD in the humanities, but I don't encourage anyone to call me "Dr. Anderson" in the context of Hammond/Leslie repairs. There's a moral to that story.
This document shows how to install our 2-speed controller for the 22H. More importantly, it also contains info on how to reduce noise with motor/rotor adjustments associated with electronic motor control.
Can't tell you how much I apreciate that document. Fantastic overview and guidence. I was aware of several methods to make the 22H a two speed. The removal of the switching tube would suggest this was the method.
I have a 5 to 6 pin cable also, the switch does not work with that one. 6 to 6 is fine, though switching does vary, sometimes flawless, other times it will cut sound either briefly, or until a organ restart. I have several 6 pin cables and this seems to be the case with all. Heat a factor? The amp in speaker does get warm, when recording the videos I felt it.
But a restart works right away.
I also got the idea there were several ways to wire the switch. I'm thinking it works, so probably it's wired as designed as noted in the document, but perhaps not as cleanly as required.
My other project is getting a 760 plugged in. Once I acomplish that I will go deep on this speaker as outlined in the PDF.
In general, can I damage the amp with high volume? EG all bars out pedal to the floor, it gets very loud. I don't mind being careful, I just want to know. If it is possible, can I adjust my RT3 to reduce the risk?
I've used many many forums over the years, on all sorts of subjects. I've never seen a forum with such decorum. Really impressive lack of negativity here. Thanks to all.
Kemp's PhD is in psychology, not electronics. I also happen to have a PhD in the humanities, but I don't encourage anyone to call me "Dr. Anderson" in the context of Hammond/Leslie repairs. There's a moral to that story.
I like him. He can call himself squire for all I care. I'm now used to his video style LOL, and his emphatic intros. Thanks to him I have the trim, tone and perc adjusted, and my 22H is signing at half volume. RT3 is much improved. He's one the few guys on YT who shows the DIY stuff, like making cable ends. Gracious and helpful to me.
And he can play Hammond organ. There is a nice little video were he visits Huss
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