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We are happy to try to answer your Hammond and Leslie related questions. Last names and email address will be omitted to protect the curious!
12/22/09

Our church has an X77 organ and X77 speaker cabinet. We have obtained a separate Leslie 122 cabinet and connection cable. Is it possible to connect the Leslie 122 to the X77?
Leslie made no console connection kit for this application. The X-77 organ requires a four channel amplification system, which is why a special Leslie was constructed for it. The 122 Leslie is a single channel unit, so in order to use it you would first need an interface that combines the four organ channels into one. This is not a commercially available product and would have to be custom built.

4-channel, early 80s model) Service brochure - Leslie 415, HL422 and 315 Service brochure - Leslie 715, 815, HL722 and HL822 Service brochure - Leslie 710. Model 520 are essentially the non-rotating components of the Model 720 in a smaller chassis. Leslie Speaker forms, circuit diagrams. The service manual and parts are the same for all four models. This model was designed to be used on 2 channel organs, with the appropriate console connector kit. Download LESLIE SPEAKERS 750. Service manual & repair info for electronics experts. Service manuals, schematics, eproms for electrical technicians. This site helps you to save the Earth from electronic waste! LESLIE SPEAKERS 750. Type: (DJVU) Size 1.1 MB. Category AUDIO SERVICE MANUAL.

Is the Hammond M-3 compatible with a Leslie 147?
Sure. For this application you could use the modern day 6147 console kit or the legacy 26-1 kit. Just about any Leslie can be fitted to the M-series organs; Hammond console kits are also available for most 9 and 11 pin models as well as the 122 family.

Please clarify whether a Leslie 710 under 1 channel operation via the Trek LCO-1A nullifies/mutes the 6 X 9 rotosonic speaker as well as both upper-lateral speakers and thus the aforesaid speakers end up useless for reverb reproduction purposes nor available for the 1 channel operation mode.
That is not exactly correct. The LCO-1A takes the full range organ signal and splits it into two frequency bands: low and high.
The low frequencies (150 Hz and below) are routed to the stationary channel amplifier. There is a passive crossover (post amplifier) that further splits this frequency band between the 15' speaker and the two 6 x 9 speakers. I do not know the crossover frequency here, but one might suspect that very little signal is sent to the 6 x 9 speakers.
The high frequencies (above 150 Hz) are routed to the rotary channel amplifier. Once again, a passive crossover splits this set of frequencies between the 6 x 9 rotosonic drum and the compression driver. I suspect the crossover frequency here is 800 Hz. If so, the rotosonic drum receives the tones from 150 to 800 Hz, while the driver receives tones above 800 Hz.
In practice, the 710 with an LCO-1A, when attached to a B-3/C-3 or earlier organ, produces a very nice sound. It's quite a bit louder than the standard Leslie 122, but when pushed into distortion the tone is not as pleasing.

I just acquired an E100 model. When the motor gets to operating speed it makes a horrible screeching noise. Organ plays perfectly but wow that noise is awful. Should I allow some more time for the oil to make its way to where it needs to be?
Generally the noise you are describing is one or more generator bearings protesting the lack of oil. It can take several weeks for oil to work its way into dry bearings via the wicking system. You can also manually oil the affected bearing (s), though some disassembly of the organ is required to do this.

Where can I get an owner’s manual for my Hammond S-6 chord organ?
Owner and service manuals for all the Hammond organs produced from 1935 to 1985 can be obtained from Organ Service Company (www.organservicecompany.com). They also have Leslie manuals available.

I have a Hammond C-2 and want to add percussion to it. I have an AO-29 amp from an M-3. I have access to the bar for the percussion switches and matching transformers.
My problem is my schematic reading skills are somewhat lacking as is my experience with Hammonds. I have the service manuals for both the M-3 and the C-2. Is this (in your opinion) a viable good alternative to finding a AO-28 amp?
This is way too complicated. I'd just install a Trek TP-2B and spend all the time saved playing the thing.

Is there a way to replace the field coil speaker in my Hammond M-3 with a more modern speaker? I can’t find any information anywhere about this.
Yes. Hammond issued Technical Service Bulletin #27 on this subject. The solution involves adding a high wattage resistor across the wires for the field coil.
Technical Service Bulletin #8 addresses this issue for the early Hammond Tone Cabinets that used field coil speakers. Drop us a note and we will email these TSB’s to you.

I have a Hammond L122 spinet. How exactly can I connect a 9 pin Leslie 760 rather than the usual 6 pin 145/7)?
Sure. Grateful dead barton hall poster. You would use a 9770 console kit for this application.

03/09/06

Jason writes: 'I have a Hammond M-3. Would I be better off with a Hammond L-100?'
Maybe. Take a look at what this guy did with one.

Jack writes: 'I have an L-100 which I have 'engineered' to a Leslie 120 (no amp) using the correct half moon switches and triggering the relays in the Leslie correctly. I get a pop when I switch to fast. How do I stop this?'
Try a .1 mfd 600 volt Orange Drop 715 series capacitor across pins 2 and 5 of the Amphenol.

Duane writes: 'I am attemting to hook a 600 ohm audio signal into a PR40. First I had to take care of a bad hum, mabey a filter cap. I ripped out the pr40 amp filter cap and replaced it with 3 electrolytics in parallell. The two black wires going to the filter cap, one must have been ground. I hooked both black wires to the + caps, turned on power and had an impressive lighning storm in the first 5u4g tube in the power supply. I reconfigured the wires from ac wall 3 pin plug to power supply connector, powered up again and had another lighning storm inside the second 5u4 on the power supply. I think the two black wires I hooked to the amp filter cap, one must have been ground. I have no idea what I am doing here, all I want is to hook a 600ohm audio signal from a radio into the PR40 and power the PR40 from the 115v wall socket. Please help, ?'
I would suggest that you stop working on your power supply! I don't think it is going to get any better, and it could get a lot worse. I have replacements if you think you might need one.

08/14/05

Ken writes: 'I see your leslie 122 tube set includes 12AU7A tubes - why not 12AU7 tubes as shown on the label? What is the difference? ?'
The difference between the 12AU7 and 12AU7A is the 'A' can be used in series string filament circuits due to it's controlled warm-up cathode. Otherwise, there is no difference and it can be d

Leslie 710 Service Manual