From ted@speakeasyvintagemusic.com Fri Nov 09 13:56:07 2007
Subject:Re: Leslie switching - How, Why, and What used to be...

That's it - that and the executive decision to reuse the 6 pin connector
already installed on the organ, for the sake of showroom convenience at
the dealership. Hooking up a connector kit inline with the preamp
output was relatively easy, but changing/adding a socket was a whole
different matter (especially on the 4 poster "B" type cabinets.)

Early cabinets did attempt to make the 31 series instant switching.
First you had to flip a switch on the cabinet. Then they went to a
system with a switch at the console that looked for an increased load on
the B+ lead, but that was unreliable. Then finally they adopted the
"piggyback DC" system that we all know today.

Cheers!

Ted Thompson
General Manager - Speakeasy Vintage Music

* * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* PH: 717.292.0814 *
* Main Site: http://www.speakeasyvintagemusic.com *
* Media Site: http://media.speakeasyvintagemusic.com *
* Support: http://support.speakeasyvintagemusic.com *
* MOSweb: http://www.mosweb.com *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Bruce Wahler wrote:
> Hi David,
>
> It's not that anyone WANTED to wait -- at least, in the early days. The combining of audio and speed switching on one pair of wires actually saved cable cost and size. In the Vibratone's original use -- theater and liturgical music -- the use of tremolo was generally on a per-song basis, so the 2-sec. delay was considered a minor inconvenience.
>
> Musicians, OTOH, have a tendency to incorporate design flaws into their playing style. Thus, some players actually prefer the delay.
>
> Regards,
>
> -BW
> --
> Bruce Wahler
> AshbySolutions.com_
> 978.386.7389 voice/fax
> bruce@ashbysolutions.com
>
> At 06:30 PM 11/9/2007, you wrote:
>> That's a pretty silly design. Why would you want to wait a second or two for the speed to change? I have a b3 with a 147 and a 122 hooked up to it and it seems that both spin at the same time.
>> Sent via BlackBerry from T-Mobile
>>
>> -----Original Message-----
>> From: Ted Thompson
>>
>> Date: Fri, 09 Nov 2007 16:14:28
>> To:CloneWheel@yahoogroups.com
>> Subject: Re: [CWSG] Re: Fwd: Decimator web page up with sounds
>>
>> A 122 and a 147 will respond identically (within the mechanical
>> tolerances of the system) *once the relay closes*
>>
>> That's the rub. A 147 relay (be it mechanical or solid-state) will trip
>> immediately when the speed switch is thrown. A 122 relay will be
>> delayed by as much as a second or two.
>>
>> Once the relay has toggled power from one motor to the other the two
>> rotors change speed based on their properties, the horn being light
>> changes speeds rapidly, while the rotor being heavier takes a few
>> seconds to achieve the same change.
>>
>> TECH CORNER: The reason for the delay is that a 122 has it's control in
>> the form of a DC voltage riding on the audio lines. If that DC voltage
>> were to be instantaneously toggled from 0v to 40 or more volts (or vice
>> versa), you'd hear a bang in the audio. As a result it is designed so
>> that it slowly rises when you switch one way, and slowly falls when you
>> switch the other way. This takes time of course, and that's why you
>> have to wait for the switching to occur.
>>
>> Cheers!
>>
>> Ted Thompson
>> General Manager - Speakeasy Vintage Music
>>
>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>> * PH: 717.292.0814 *
>> * Main Site: http://www.speakeas yvintagemusic.com *
>> * Media Site: http://media. speakeasyvintagemusic.com *
>> * Support: http://support. speakeasyvintagemusic.com *
>> * MOSweb: http://www.mosweb. com *
>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>
>> tonysounds wrote:
>>> I thought that the 122 and the 147 used different switching systems (one was AC); the ramp times were the same (depending on maintenance) but the initial impulse to change was delayed in the 122.
>>>
>>> Again, I'm not trying to crawl into my own colon on this, but to me, that's as much a factor in ramp time as anything else: I say "go!" and it takes "X" for that to happen. Whether it's a cloth pulley, a DC-switch, or a sag in idler arm, it doesn't matter: the net result is it's slower.
>>>
>>> T
>>>
>>> goffmac747@aol. com wrote:
>>>
>>> now that is an improvement on the improvement...
>>>
>>> -----Original Message-----
>>> From: Ryan Stroup gmail.com>
>>> To: CloneWheel@yahoogro ups.com
>>> Sent: Sat, 10 Nov 2007 2:53 am
>>> Subject: Re: [CWSG] Re: Fwd: Decimator web page up with sounds
>>>
>>> Yeah, I think he may have been talking about the delay, not the actual
>>>
>>> ramp time. That threw me off too for a second!
>>>
>>> I forgot to mention something else. I'm pretty sure Speakeasy doesn't
>>>
>>> make those rubber "O ring" style belts anymore. The belts are now a
>>>
>>> green polymer material. You can actually stretch these belts to obtain
>>>
>>> slower horn speed. That's what I did. Just be careful not to stretch it
>>>
>>> too far otherwise it'll be too big to fit around the horn pulley and
>>>
>>> motor pulley without a tensioner.
>>>
>>> --
>>>
>>> Ryan
>>>
>>> Dave Bradley wrote:
>>>
>>>> I wouldn't say they ramp faster. In fact, once you pull the amp out of the
>>>> cabinet, a 122 and a 147 are identical.
>>>
>>>> However, the 122 does have a DELAY before the relay trips, while the 147
>>>> does not. So while the 122 takes about a second before it start ramping, the
>>>> actual ramp time is no different.
>>>
>>>> Moe
>>>
>>> __________________________________________________________
>>> Email and AIM finally together. You've gotta check out free AOL Mail! - http://mail. aol.com
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>> "The meek shall inherit nothing." -FZ
>>> www.myspace.com/tonyorant
>>>
>>> __________________________________________________
>>> Do You Yahoo!?
>>> Tired of spam? Yahoo! Mail has the best spam protection around
>>> http://mail. yahoo.com
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>> To unsubscribe, send email to: CloneWheel-unsubscr ibe@yahoogroups.com
>>> Yahoo! Groups Links
>>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>> To unsubscribe, send email to: CloneWheel-unsubscribe@yahoogroups.com
>> Yahoo! Groups Links
>>