From jbsherry@gmail.com Sun Sep 24 07:30:50 2006
Subject:Re: how different is an A-143 from a B-3?

Not from everything I've read. According to this site:

http://www.theaterorgans.com/hammond/faq/a-100/a-100.html

there's separate Pre-amp, Power amp, and Reverb amp. Also, the wiring diagram from the
same page has the AO-28 clearly labeled:
http://www.theaterorgans.com/hammond/faq/a-100/schem2.jpg

Bottom line, an A-100 through a Leslie sounds like any console through a Leslie.

The original poster may mistakenly believe that B3s and C3s shipped from the factory with
Leslie hookups. Not so. Mr. Hammond disliked leslies. He admitted no benefit to the
sound of his organs, and clearly saw them as competition for Hammond tone cabinets.

The A is definitely a great way to get a console at lower cost. The Leslie hookup can be
added.

-jb

---quote---
PREAMPLIFIER

The Preamplifier is located within the console, suspended from the main generator shelf.
Its purpose is to amplify the signals before sending them to the amplifier. This unit also
houses the electrical portion of the swell or expression control .

POWER AMPLIFIER

A twelve watt amplifier is mounted on the lower shelf of the console. It receives the signal
from the Preamplifier and increases it in power to drive the two 12" speakers.

REVERBERATION SYSTEM

To the left of the amplifier are the reverberation amplifier and reverberation unit. A
portion of the output signal of the power amplifier passes through the reverberation unit
to the reverberation amplifier and this drives a third 12" speaker housed within the
console. The degree of reverberation heard can be regulated by rotating the knob marked
"Reverberation Control" shown in Figure 5.

In operation, an electrical signal from the amplifier is applied to the driver unit in the
reverberation device which then converts the electrical signal into mechanical energy. This
energy is transmitted through springs to a pickup unit where a part of it is converted back
to electrical energy. The remaining portion is reflected back to the driver and again back
to the pickup at a time interval determined by the spring lengths. This transaction
continues until the signal energy is reduced to one millionth of its original value. The
transfer time from driver to pickup and the reflections within the system itself produce the
reverberation effect.

---quote---

--- In CloneWheel@yahoogroups.com, Bruce Wahler wrote:
> - A perfect match, Leslie-wise, is a model 251, which has an extra stationary channel.
>
> Regards,
>
> -BW
>
> --
> Bruce Wahler
> Online Music Sales
> AshbySolutions.com™ http://music.ashbysolutions.com
> 978.386.7389 voice/fax
> bruce@...
>
> [Non-text portions of this message have been removed]
>