[sdiy] Hammond Vibrato Scanner

[Michael Ruberto]

Big problem, there is no place to oil the scanner. I found the 2 funnels for 
the generator and the 2 cups on the motor but nothing for the scanner. 
What's more is this scanner is huge compared to the ones dipicted on the 
websites I've looked at. It measures a full 5" by 3.5" roughly.

The scanner is the loudest mechanism in here. Everything else is silky 
smooth while running but the scanner has a constant sound not unlike bad 
brakes on a car. Given the mechanical noise it emits I am suprised it even 
works.

I guess the T500 is also unique in it's scanner. Seems to be different from 
the other Hammonds.

M. A. Ruberto


>From: "Michael Ruberto" <frankentron at hotmail.com>
>To: dougforbes at sbcglobal.net, synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] Hammond Vibrato Scanner
>Date: Fri, 29 Dec 2006 17:47:18 -0500
>
>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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