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#703604 - 04/12/08 08:14 PM Leslie question
88obsession Offline
Junior Member

Registered: 04/29/07
Posts: 4
Loc: Denver

I have purchased a B3 that's wired for a 122. Will it play through my 147 and will it do any damage if I try?

#703605 - 06/18/08 07:09 AM Re: Leslie question
WRB-Greg Offline
Junior Member

Registered: 06/17/08
Posts: 6
Loc: CT
Is the cable pin-out the same? I believe those two models have different amplifiers. Also, on my Leslie Pre-Amp (I play an XK2), there are separate outputs for the 145/147 and the 122 (and other series) Leslie. So my layman's guess would be to say there could be some damage. Google the specs for those Leslies. There are TONS of info available.

#703606 - 06/26/08 05:57 AM Re: Leslie question
Ken Knapp Offline

Registered: 04/18/06
Posts: 2352
Loc: Pennsylvania
They are two different connections. If I recall correctly you could get quite a hum through the speaker and your fast/slow switching won't work right.


Piano Organ Depot
Hammond Organ Technician
Vice President - MITA, International

#703607 - 08/02/08 12:53 PM Re: Leslie question
sgreene123 Offline
Junior Member

Registered: 08/01/08
Posts: 4
Loc: Boston Area
There are two types of pin-outs - 11 pin and 8 pin. As long as the pinout is the same, you should have no problem.
"You will always be able to hear more than you can play." Miles Davis

#703608 - 08/02/08 02:21 PM Re: Leslie question
arcsound Offline
Junior Member

Registered: 05/16/08
Posts: 13
Loc: Troy, VA
Depending on how the signal leaves your B3, it may do damage to the 147. Even though the 122 and 147 have the same input connector (6-pin), they are expecting different types of signals. The 147 is an unbalanced input, i.e. one lead is the signal, and the other is the ground, pins 1 and 6, respectively, if memory serves. It expects an unbalanced output from say a Leslie Preamp pedal. The speed control is 110VAC switched to pin 2 or 5. The 122, however, was designed to work specifically with the Hammond organ, and as such, expects a balanced input, Signal-1 and Signal-2, for instance. Furthermore, the input is decoupled from the tube grids with a cap to allow for an approx. 80 VDC control signal to "ride" on one of the Signal lines, and act as a control signal to switch between fast and slow speed. This was done to accomodate the 5-pin Hammond connector (not enough pins for all the signals required, when speed control is considered. Mr. Hammond did not appreciate the competition for tone cabinets from Mr. Leslie and wanted to make it as difficult as possible to interface the two units, hence the pin incompatibility, which Leslie solved rather elegantly, IMHO). So, you have different options but the easiest is the change the 147 amp front end to replicate that of the 122 amp, by:
1) rewiring so that it is balance input
2) adding the decoupling cap
3) changing the relay from 110VAC to 80VDC
Note: this information is from memory, and it's been awhile since I've fussed with this stuff, so please verify the details independently, or get a technician to make the change for you if you are not comfortable wiring line voltage circuits.
Hope this helps!


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