[sdiy] Hammond Vibrato Scanner

[Michael Ruberto]

Doug,

Cool, this is just what I was looking for. The vibrato on my spinet works 
and sounds good, but there sometimes is a mechanical high pitch grinding 
sound. It's very sporadic - I can play the organ for a few hours and only 
hear the noise for like 10 seconds then it's gone.
I bought some Hammond Generator Oil today and I'm hopeing a simple lube will 
cure the problem.

This is a really interesting unit. The design is really unique. Makes me 
think of the variable air capacitors in old tube television sets. I wonder 
if it isn't too difficult to build a device like this using the delay line 
and an analog multiplexer. I'm sure the inductors would play merry hell with 
the multi chip though.
I'll have to study this some more, it's quite inspiring. Maybe some synth 
apps for this design.

Also, from studying the schematics I have there are some other very neat 
little circuits I think could be useful for a synth. The generator amp for 
the bass pedals has some potential.

M. A. Ruberto

>From: "Doug Forbes" <dougforbes at sbcglobal.net>
>To: "'Michael Ruberto'" 
><frankentron at hotmail.com>,<synth-diy at dropmix.xs4all.nl>
>Subject: RE: [sdiy] Hammond Vibrato Scanner
>Date: Fri, 29 Dec 2006 13:32:16 -0800
>
>It's a big multitap variable capacitor. They get a growth on the plates 
>that
>is conductive and needs to be cleaned. Here is just one of many links
>available on-line dealing with the cleaning process :
>
>http://www.bentonelectronics.com/vibrato.html
>
>
>Doug Forbes
>

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