[sdiy] Top Octave Generators, beehiving and leakage

[Veronica Merryfield]

DPX. Had one once. Drove across the UK to get it as well in a borrowed  
wreck of a car. Wish I could find the schematic. Had a great great  
chorus section that I added an external input to. I quite liked the  
string sound from it too, had a raspy edge to it which made it stand  
out.

If anyone has the schematics or ETI articles...


On 2-May-08, at 12:21 PM, Mike I wrote:
> That old  ETI- Powertran String-thing article by Tim Orr makes some  
> mention
> of the beehiving problem.
>
> Funny to see that   "Key Click" and "Leakage" have become  
> virtues    :D
>
>
>
> ----- Original Message -----
> From: dragon.servicing <dragon.servicing at googlemail.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, May 02, 2008 2:25 PM
> Subject: [sdiy] Top Octave Generators, beehiving and leakage
>
>
>> Hi,
>> I think that the background noise on the older organs is called
>> Beehiving. some models have worse background noises than others. It
>> seems it is quite hard to design an organ that has a low background
>> noise. Dc switching ( electronic switching ) on the keyboards  
>> ( rather
>> than switching the audio directly ) can help as you can then keep the
>> audio signals away from other bits of wiring and circuitry.
>> I think the leakage knob may be to simulate the effect of all the
>> different tonewheels being together on a Hammond organ.
>> ( the signal levels from the tonewheel generators are quite small, so
>> there may be coupling ? effects between them) .
>> regards Peter
>>
>>
>>
>> Dave Manley wrote:
>>> Roy J. Tellason wrote:
>>>>
>>>> I'm thinking of all that background noise I used to hear in some of
>>>> those organs I worked on....
>>>>
>>>> It's not at the outputs,  but all that stuff going on being  
>>>> picked up
>>>> elsewhere,  particularly in any lower-level circuitry that's the
> problem.
>>>>
>>>
>>> In pursuit of emulation perfection, The VOCE tone-wheel modules  
>>> give you
>>> a 'Leakage' knob to set the level of all this buzzing crosstalk.
>>>
>>> http://www.voceinc.com/
>>>
>>> -Dave
>>
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