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no, from my understanding, the frequencies are separated from within the amp, an internal dividing network??
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The X77 has four channels: Vibrato, Non-Vibrato, Reverb/Percussion, Bass. These signals are derived within the console. Are you preserving these independent channels or is your intent to take the components from the X77L and make a conventional single channel Leslie?Comment
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i am only utilizing the Bass channel and the Horn driver is being powered by the Green wire (non-rotary input, according to uncle Harvey's guide to Leslie pin outs) is this the correct channel?Comment
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1 Black SIGNAL/DC GROUND
2 Red ROTARY CHANNEL INPUT
3 Yellow NON-ROTARY INPUT [Channelling determined by tab settings at the organ]
4 Orange BASS-CHANNEL INPUT
5 Green NON-ROTARY INPUT [Channelling determined by tab settings at the organ]
6 White TREMOLO GENERATOR INPUT
[Channelling determined by tab settings at the organ]
7 Violet TREMOLO/CELESTE CONTROL
[Grounding pin 7 switches rotor to slow and vibrato amplifier channelling]
8 Gray AC POWER IN
9 Blue AC POWER IN
this is a table showing the 9 pin connection made between my hammond x77gt and leslie x77p. i clipped the white, red, and yellow wires to make room for my 3 wires to leslie switch and the horn is driven by the audio signal from pin 5. is this correct, or should i have used a different channel for the horn speaker? any help would be appreciated.
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i thought maybe it was just a problem with my jensen v21, so i swapped with another driver from a WORKING leslie cabinet, and the sound is still distorted, i sounds like the horn is getting too much bass? is this because maybe im running it through the wrong channel?Comment
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also, does anyone have a copy of the service manual for the x77gt/x77p?Comment
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Ok, problem solved! I took the Jensen V21 all apart to find that someone before me had already made an attempt at replacing the diaphragm. With that being said, there were too many spacer disks under the diaphragm which raised it higher than normal, not allowing the voice coil to fully enter the magnet gap. With this repaired, i swapped it out with my replacement driver to find that the replacement was only rated at 11 ohms. could this be the reason for all the distortion? After returning the repaired V21 to the cabinet, everything is working and sounding great!Comment
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Now that i have solved my distortion problem.......when i picked up this organ, the previous owner informed me that the bass pedals did not work. I got the organ home and installed the pedal board and....NO SOUND. Even with all 4 pedal drawbars pulled out and both string bass pedal tabs pushed down, nothing. i checked all the connections and there didn't seem to be an issue there, so i removed the pedals and checked the actuators, they all look straight. When i push the buttons on the pedal contact box, NO SOUND. Can anyone shed some light on what might be causing this?Comment
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Keep in mind that the X77 is a four channel organ and that pedals will be on the bass channel. So it could be the bass channel output card in the console, the pedal preamp, or the pedal gate amplifier.
If you don't have a service manual, that's your first order of business.Comment
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Hello everyone,
I've been off-line for a while. Life stepped in and handed me a few rough deals, but I'm back. This is an interesting thread for as I love the X77, it's just too bad that in Hammond's effort to offer the Pros a souped-up B3, they failed. Granted, they gave us to extra harmonics on the upper manual, one extra on the lower, and finally took the footages all the way down, but aside from that all they gave us was a stripped-down H-100 in a slick case. And by stripped-down I mean they couldn't even give us a generator-driven vibrato/chorus system. Instead, they hoped a Leslie, albeit equipped with space generators and extra pulleys and other service-hungry crap, would suffice. Well, it didn't. Why, then, am I on my 4th one? Good question. I guess it's because I can't deny that I love the instrument. I love the extra drawbars and sass they add, and I love the styling of the console. Sadly, I also can not deny that the electronics inside the X were poorly researched and, even after replacing every transistor and capacitor in the organ, which I have done to all of the Xs I've owned, they still hissed and crackled and were prone to failing.
I've placed numerous posts under this thread in the past, but it's been a few years. Back in 2010 I did my last overhaul of the organ's electronics for a jazz fest I was set to play for. The concert went okay but I was again unhappy with the outcome and decided to gut the thing, and in the process add the cool stuff that Hammond should have added during their R&D back in the day. And along the way I've added some other items that simply weren't available at the time. This project began about 4 years ago and I uploaded a few pics at the time--they should be around here somewhere. I call the organ an X77-B, because I added a vibrato scanner and line box. The X77-B also has an 8-voice percussion system, an effect I call Chord Comp, which is similar to Lowrey's AOC (automatic orchestra control), upper manual effects like a phaser, echo, and wah-wah unit, and velocity-sensitive MIDI, which is mated to a Roland synth module inside the console. The lower manual has 8"and 4"strings on it, and the Trek II string bass unit, which replaced the X's malfunctioning string bass system, can also be played from the lower manual. All the electronics have been scraped, along with that monstrosity they called a Leslie. It was just too much work to rewire it so that it operated like an actual Leslie, so I saved the crucial parts and built my own. I also got rid of the control panel and had a new one fabricated. I hate those impossible-to-fix-or-clean tongue tabs. And to bring all those great harmonics out, I installed a Trek II preamp. It handles the percussion, adds reverb, handles the vibrato scanner and line box signals, and even offers to auxiliary channels for the strings and MIDI.
I can't wait to play it. haha...it's been a long road. I had to put everything aside for about a year, but now life has settled down and I can finally get back to it. If anyone's interested, I'll be happy to keep you posted on my progress.
Bruce
Over the years: Hammond M3, BC, M102, B3, four X77s and three PR-40s, a Thomas Electra and a Celebrity, three Fender Rhodes, Roland HS-10, HP-2000, HP-600, RD-600, JV-880, a thing made by Korg (?), two Leslie 910s, 122, 257, 258, 247, two 142s, and three custom-built Leslies. Wow, way too much money spent!
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Does anyone have copy of the service manual for the X77GT, or know where i can find one?Comment
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I could be wrong, but i would think it's not the bass amplifier since the bass signal from the manuals sounds fine through the bass speaker. I forgot to mention that i tore into the switch box for the pedals (box with 25 buttons on top) and sprayed contact cleaner on all the wire connections and buss rods inside, i even shifted the buss rods (used a screwdriver, and gave the little brass peg a few turns left, then right). Afterword i fired up the organ and now when i press the buttons i get a faint 'pop' coming through the bass speaker, but still no tones? does this shed any light on what the problem could be? All the connections from the TG to the pedals look fine. I also apologize for all the long explanations, but i'm fairly new to this, and my terminology could be wrong, so i just want to make sure everyone understands what i'm trying to say. Any and all advice is greatly appreciated. Thanks!Comment
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Start with the Pedal Gate Amplifier and the Pedal Gate Drive circuits.Comment
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The pedal gate amplifier is located inside the ORGAN right?Comment
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one last thing, there is a black lead coming out of the leslie power supply (ground) that is SUPPOSED to connect to one of the amplifiers on the leslie back panel, but i could not figure out where? would this cause no tones from the pedal amp? also there is a LOT of HUM coming out of the leslie.Comment
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