[HAM] Motorboating Not the Scanner!

[joe d]

A friend of mine had a case where it was a connection/wiring issue - kind of "jiggling the wiring loom solved it/led to the real culprit (just not sure which it was exactly, sorry). 
the organ was the B3 at SF's boom boom room (which needs some serious attention now, I can confirm that as of recent).
 
So it's worth a shot at "carefully" hunting and checking if it's connection/wiring related.
 
> Date: Mon, 19 Nov 2007 10:19:59 -0800> To: hammond at zeni.net> From: organfreak at donobi.net> Subject: [HAM] Motorboating Not the Scanner!> > > A cautionary tale for you do-it-yourselfers:> That pesky "motorboating" sound is not always a vibrato problem, and I have > the repair ticket to prove it. The first thing I did to this customer's > A-100 was, while it was running and it was making the bad noise, I put my > finger (inside a shop rag) on the flywheel and slowed it down. The noise > did not slow down in frequency. I stopped the generator with the organ amp > still running, and guess what? Motorboating! ("BUP-BUP-BUP-BUP.")> > Snooping around inside the amp revealed that the high-voltage (B+) supply > was fluctuating everywhere in the amp, at just the same speed as that > noise. Fix? New filter caps. And let that be a lesson to you, as it was for me.> > I hate to see people rebuilding scanners unnecessarily.> > > > --> Subscription Options/Unsubscribe/Archives: http://www.zeni.net/hf/> Hammond-Leslie FAQ: http://theatreorgans.com/hammond/faq/> HammondWiki: http://www.dairiki.org/HammondWiki/> hammond at zk3.dec.com archives: http://zk3.hammondforum.com/> 
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