Hi Chris,
Thanks, but the circuit is not even close. What I've got is a
totally passive circuit.
I see your point about shorting the "unused" speaker, but that's not
how mine works. My MEE switch
only has three wires going to it. The "center" wire connects to
Main, both or Echo, depending on the
switch position.
The thing is, this used to work. But the guy that installed the kit
just put the box inside the organ case,
next to the preamp. In order to connect the Leslie, you had to leave
the back of the organ off. That
looked strange, so I extended wires from the box to the pedal case
and put the 9-pin connector
where it's supposed to go. In doing so, I might have messed
something up in the kit's wiring and
haven't found the schematic for it. This is as close as I got to the
right circuit. At least, the MEE and
Tremelo switches match what I have.
-- Bob
On 1/1/2022 10:36 AM, Chris Clifton
wrote:
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I'm guessing that it will be similar to this one, .
All the kits I've looked at for connecting 9-pin Leslies to
console Hammonds seem to use the same basic circuit.
When the MEE switch is set to echo, the brown and orange wires
are connected together. This effectively puts a short circuit
across the input terminals of the PR-40, muting it. The two 820
ohm resistors, R2 & R3 isolate the G-G terminals of the
organ from the short circuit. When thinking of MEE switching on
console type organs, I find it helpful to think in terms of the
switch muting the unwanted speaker, rather than enabling the
wanted speaker.
To use a two channel Leslie with a single channel organ, you
will need a crossover between the organ and the Leslie. These
crossovers are usually built into a short piece of tube with a
9-pin plug on one end, and a 9-pin socket on the other. The
crossover ensures that bass notes always go to the stationary
channel of the Leslie and sound through the 15" speaker, only
mid to high frequencies go to the rotary channel as the speakers
of this channel can't handle low frequencies.
On 01/01/2022 14:49, Bob Pasky wrote:
Does anyone have schematics for this Leslie Connector: 113910 ?
It's for adapting a B-3 to a Leslie 710.
I've looked in the usual places, but haven't found this
particular model.
Barring that, can anyone tell me how the signal to the PR-40
should be terminated
when the MEE switch is set to Echo? (The PR-40 is Main, the 710
is Echo). It appears
that the Main signal just floats and I'm reading something like
5v to Gnd. It makes an
awful "sproing" noise from the PR-40 when it's switched from
Main/Ensemble to Echo.
That can't be good for the PR-40 amp.
Thanks,
-- Bob
--
Bob Pasky