Hi! I have an M-100 and i am curious about what terminals you connected the quarter inch jack to. What terminals on the amplifier did you solider the quarter inch jack to?
Hi, the jack is connected to the output transformer (so it’s practically connected directly to the speakers). I used a DI box to lower the high signal level coming out of the amplifier and have an insulated, high impedance connection. Hope it helps!
@@DaveElectronics So would I get the same result if I soildered an instrument cable to the terminals on one of the speakers and then ran it thru a DI box? (I worried about scewing up the omage)
I have a quick question, when using the bypass resistor instead of speakers, does hooking the DI Box add additional impedance? It seems that the resistor and the DI box together would have their own impedance.
As far as I can tell, the only purpose of adding this impedance-matching resistor is so that you can turn the internal speakers off. If you just took the signal and sent it to the DI via a jack output (say, to record with a DAW), this would still work without adding the whole switched circuit?
Hi, yes, shure it will work just fine. I made the speaker bypass mod because, let's say, if i want to record a piano and the organ is close to it, i don't want the sound of the organ to spoil the piano recording.. it's just for convenience ;)
@@DaveElectronics Is there anything special that you do with the bypass? or do you just simply shut that amp and speaker off from the console when using DI.
The purpose of the DI box is to match the impedance for a direct connection to a preamp, an effect pedal or another amplifier (i often plug it directly to a Vox AC30). I added a switch to bypass just the speakers, so i can decide whether I want also the sound from the organ or not (for example, when I want to record just the dry sound from the organ, i bypass the speakers).
Hi! Great video, thanks! I just don’t Knie if I get it right: So the Switch, Switch between loudspeaker(s) and resistor. And the same output (but on the amp it self ) is connected to the DI-Box input? So the resistor AND the DI is connected? Or do you use the switchmechanism on the Jack? Cheers, Danny
Hi, thanks for the comment! The switch selects between the speakers and the bypass resistor. The DI box is connected to the output transformer (basically direcly connected to the speakers). You need the transformer of the DI box for the high impedance and to lower the signal level. The DI box is always connected, whether the switch is in the bypass position or not, but is a choice that I personally made for my convenience (basically for recording both the direct sound from DI box and the “real” sound from microphones on the speakers). Hope it helps! Dave
I have a question if you can help, I purchased a CV model that was sitting for years, i added oil, my tone generator wont start. The starter motor turns and connects with small gear on main shaft,but the main drive shaft doesn't spin. Do you know what may be the problem? Any help would be appreciated
Hi, have you tried turning the main shaft by hand? Try to isolate the problem. It might be the main sync motor (although is quite rare) or the scanner vibrato (if your model is equipped with it), so try to detach the main motor from the main shaft (simply by removing the flywheel). If it doesn’t turn, the problem is in the generator itself and you might have to remove the entire assembly from the organ and take a look inside by removing the metal cover on top. It’s a lot of work, but if the problem is there it could be some suck gears (usually not the tonewheels, you can hold a tonewheel and the shaft will continue to turn). I highly suggest you to download and print the service manual of your model, it’s very well done, with step by step guides on how to disassemble the various parts properly. Hope it helps, feel free to ask if you have problems.
Alright! So I'm trying to do something similar to what Jon Lord did. Would there be a problem if I'd use this method and get the signal into a guitar combo PLUS use a leslie with built in pre amp (Like the 125) ?
Yes, you can! This ‘mod’ allows you to connect the organ to anything that has a 1/4” Jack input. For example i use a signal splitter to connect the organ to the audio interface (for dry recording) and to the leslie simulator (mono input). The Leslie simulator (Boss RT-20) has a stereo output and i then connect it to two Vox amplifiers to have a beautiful stereo sound.
Thanks for the video. I just picked up a M112 and am looking at doing the same thing. What is weird to me is, my speakers appear the same as yours but are 16 ohm each, so together equal a total 8 ohm load. You said yours together were 4 ohm, which made me worried. Any thoughts?
Hi! Thanks for the comment! That’s a really nice question, thanks for pointing that out. Reading the manual the speakers should be two 16 ohms in parallel (so, as you said, total load of 8 ohms). Can’t really remember the impedance of mine, perhaps in the video I made a mistake… I will measure the speakers again and i’ll keep you updated. In any case, i highly suggest you take the measurements of each speaker (while disconnected from the amp) separately with a multimeter and stick to the total impedance of yours. Hope it helps, Dave
Although both are expressed in ohms, resistance and impedance are different concepts. Impedance only relates to alternating current and is frequency dependent. The audio output of an amplifier is alternating current. Speaker impedance is a nominal figure used for audio system design. Impedance cannot be measured with an ohmmeter; only resistance can.The 4 ohms you mention is the nominal impedance which results from having two speakers, each with a nominal impedance of 8 ohms, connected in parallel. The *DC resistance* of each speaker, as measured by an ohmmeter, will not be 8 ohms but more like 6 ohms. That said, a 4 ohm resistor will fool the output transformer into believing it is working into a 4 ohm impedance.
Yes, correct! I should have mentioned that in the video. I didn' t for the sake of semplicity, but yes, i'm using a resistive load and not the inductive load (of the speakers) which is measured differently. Thanks for the comment!
Yes, I was thinking that as well. I was hoping the 4 ohm load would be sufficient to compensate for the actual imedance of the speakers. Presumably it is since you haven't blown your amp yet! :-)
And if I were to say put the organ through an effects pedal, would I adapt the balanced signal back to a 1/4", or what? (Sorry, I'm not all yo familiar with circuitry)
Yes, i forgot to mention in the video about it, but i have a little cable that has balanced xlr (from the DI box) to unbalanced 1/4” jack. I always use it plugged to the Boss RT-20 as the Leslie simulator and it works fine.
You dont seem to get to the point very quickly, its kinda painful actually. you tell us all this great stuff with no specific details on how to connect all things relateds
Hi! I have an M-100 and i am curious about what terminals you connected the quarter inch jack to. What terminals on the amplifier did you solider the quarter inch jack to?
Hi, the jack is connected to the output transformer (so it’s practically connected directly to the speakers). I used a DI box to lower the high signal level coming out of the amplifier and have an insulated, high impedance connection. Hope it helps!
@@DaveElectronics So would I get the same result if I soildered an instrument cable to the terminals on one of the speakers and then ran it thru a DI box? (I worried about scewing up the omage)
Yes, you can! But remember that if you have the bypass mod like i do, when the speakers are bypassed, the DI is going to be bypassed as well.
Just performed the Mod and I cant be happier. Thankyou so much!!! :)
I have a quick question, when using the bypass resistor instead of speakers, does hooking the DI Box add additional impedance? It seems that the resistor and the DI box together would have their own impedance.
Hi, yes it does! But being the DI a high impedance device (much higher than the bypass resistor), its contribute is negligible.
As far as I can tell, the only purpose of adding this impedance-matching resistor is so that you can turn the internal speakers off. If you just took the signal and sent it to the DI via a jack output (say, to record with a DAW), this would still work without adding the whole switched circuit?
Hi, yes, shure it will work just fine. I made the speaker bypass mod because, let's say, if i want to record a piano and the organ is close to it, i don't want the sound of the organ to spoil the piano recording.. it's just for convenience ;)
What are the 3 speakers in the cabinet for? The two large ones are in parallel but what about the third one?
Hi, the two large speakers are for the main organ speakers (so dry, direct sound), the third one is the speaker for the spring reverb.
@@DaveElectronics Ahh ok.. Thankyou! i have been curious of that for a while.
@@DaveElectronics Is there anything special that you do with the bypass? or do you just simply shut that amp and speaker off from the console when using DI.
The purpose of the DI box is to match the impedance for a direct connection to a preamp, an effect pedal or another amplifier (i often plug it directly to a Vox AC30). I added a switch to bypass just the speakers, so i can decide whether I want also the sound from the organ or not (for example, when I want to record just the dry sound from the organ, i bypass the speakers).
@@DaveElectronics Ohh, I was meaning the reverb amp and speaker! sorry.
Hi! Great video, thanks!
I just don’t Knie if I get it right:
So the Switch, Switch between loudspeaker(s) and resistor.
And the same output (but on the amp it self ) is connected to the DI-Box input?
So the resistor AND the DI is connected?
Or do you use the switchmechanism on the Jack?
Cheers,
Danny
Hi, thanks for the comment!
The switch selects between the speakers and the bypass resistor. The DI box is connected to the output transformer (basically direcly connected to the speakers). You need the transformer of the DI box for the high impedance and to lower the signal level. The DI box is always connected, whether the switch is in the bypass position or not, but is a choice that I personally made for my convenience (basically for recording both the direct sound from DI box and the “real” sound from microphones on the speakers). Hope it helps!
Dave
I have a question if you can help, I purchased a CV model that was sitting for years, i added oil, my tone generator wont start. The starter motor turns and connects with small gear on main shaft,but the main drive shaft doesn't spin. Do you know what may be the problem? Any help would be appreciated
Hi, have you tried turning the main shaft by hand? Try to isolate the problem. It might be the main sync motor (although is quite rare) or the scanner vibrato (if your model is equipped with it), so try to detach the main motor from the main shaft (simply by removing the flywheel). If it doesn’t turn, the problem is in the generator itself and you might have to remove the entire assembly from the organ and take a look inside by removing the metal cover on top. It’s a lot of work, but if the problem is there it could be some suck gears (usually not the tonewheels, you can hold a tonewheel and the shaft will continue to turn). I highly suggest you to download and print the service manual of your model, it’s very well done, with step by step guides on how to disassemble the various parts properly.
Hope it helps, feel free to ask if you have problems.
Alright!
So I'm trying to do something similar to what Jon Lord did.
Would there be a problem if I'd use this method and get the signal into a guitar combo PLUS use a leslie with built in pre amp (Like the 125) ?
Yes, you can! This ‘mod’ allows you to connect the organ to anything that has a 1/4” Jack input. For example i use a signal splitter to connect the organ to the audio interface (for dry recording) and to the leslie simulator (mono input). The Leslie simulator (Boss RT-20) has a stereo output and i then connect it to two Vox amplifiers to have a beautiful stereo sound.
@@DaveElectronics That's awesome! I didn't think it was that easy! The DI box, and you're good!
Thanks for the video. I just picked up a M112 and am looking at doing the same thing. What is weird to me is, my speakers appear the same as yours but are 16 ohm each, so together equal a total 8 ohm load. You said yours together were 4 ohm, which made me worried. Any thoughts?
Hi! Thanks for the comment! That’s a really nice question, thanks for pointing that out. Reading the manual the speakers should be two 16 ohms in parallel (so, as you said, total load of 8 ohms). Can’t really remember the impedance of mine, perhaps in the video I made a mistake…
I will measure the speakers again and i’ll keep you updated.
In any case, i highly suggest you take the measurements of each speaker (while disconnected from the amp) separately with a multimeter and stick to the total impedance of yours.
Hope it helps,
Dave
Although both are expressed in ohms, resistance and impedance are different concepts. Impedance only relates to alternating current and is frequency dependent. The audio output of an amplifier is alternating current. Speaker impedance is a nominal figure used for audio system design. Impedance cannot be measured with an ohmmeter; only resistance can.The 4 ohms you mention is the nominal impedance which results from having two speakers, each with a nominal impedance of 8 ohms, connected in parallel. The *DC resistance* of each speaker, as measured by an ohmmeter, will not be 8 ohms but more like 6 ohms. That said, a 4 ohm resistor will fool the output transformer into believing it is working into a 4 ohm impedance.
Yes, correct! I should have mentioned that in the video. I didn' t for the sake of semplicity, but yes, i'm using a resistive load and not the inductive load (of the speakers) which is measured differently.
Thanks for the comment!
Yes, I was thinking that as well. I was hoping the 4 ohm load would be sufficient to compensate for the actual imedance of the speakers. Presumably it is since you haven't blown your amp yet! :-)
And if I were to say put the organ through an effects pedal, would I adapt the balanced signal back to a 1/4", or what? (Sorry, I'm not all yo familiar with circuitry)
Yes, i forgot to mention in the video about it, but i have a little cable that has balanced xlr (from the DI box) to unbalanced 1/4” jack. I always use it plugged to the Boss RT-20 as the Leslie simulator and it works fine.
Dv555 Alright, thanks
You dont seem to get to the point very quickly, its kinda painful actually. you tell us all this great stuff with no specific details on how to connect all things relateds
wow, I am going to start watching your vids.
Your amplifier demonstrates cognitive processes too complicated for many humans I have known for years