How do I add a 1/4 output into my organ that wasnt made with one? I Want to use an amplifier instead of the built in speakers..

[Guest]

I just bought a classic KIMBALL ORGAN that has a speaker built into the console &amp; I want to rig it up so that I can plug it into an EXTERNAL AMPLIFIER....I need to wire it so that this is possible. If anyone knows how to do this, I would greatly appreciate their help! CHEERS!</P>
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[fredy2]

Re: How do I add a 1/4 output into my organ that wasnt made with one? I Want to use an amplifier instead of the built in speakers..



If the Kimball has a single speaker you can lift the leads to the voice coil and connect a power resistor of 8 ohms between these leads. Then use a small audio transformer for isolation. Use an audio output transformer, connecting the primary across that power resistor. Connect the secondary to the pins of a 1/4 inch jack. If you need a volume control to further reduce the gain that is easily connected as well...</P>


You can find a suitable transformer at radio shack as well as the resistor.</P>


Catalog #: 274-255 1/4 inch jack</P>


Catalog #: 273-1380 transformer</P>


Catalog #: 271-120 8 ohm resistor, 20 Watt</P>


Check the transformer package for the color code of the leads. You want either the whole primary or half of the primary (using the center tap as one lead)across the power resistor. The jack connects to the secondary leads of the transformer.</P>


The transformer isolates the grounds of the organ from whatever you connect as an amp.</P>
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[Guest]

Re: How do I add a 1/4 output into my organ that wasnt made with one? I Want to use an amplifier instead of the built in speakers..



this is going to be a great help to me in doing so to one of my organs as well, fred.. thanx for the info!</P>


one further question i have is:</P>


on the transformer, there is a bundle of two wires, white and red, which i am presuming are the primary leads.</P>


on the other side, there are three wires, a black, a green, and a blue.</P>


to my knowledge, a 1/4 jack only requires a hot signal wire and a ground - what is that 3rd wire for? or is it useless?</P>


anyways, thanks for the electronic guidance.</P>

[fredy2]

Re: How do I add a 1/4 output into my organ that wasnt made with one? I Want to use an amplifier instead of the built in speakers..



The package that the transformer came in should have had the color code on it.</P>


I would suspect that the side with three leads is the PRIMARY... You will use two of these three leads. One is the center tap of the primary.</P>


Radio shack doesn't have any spec showing the color code online...</P>


First try using the leads that are farthest apart on the green, blue, black side... maybe the green and blue? If you get insufficient output to the jack, then use the middle one instead of one of the end ones. That will double the output voltage.</P>


The White and red will go to the two jack terminals... doesn't matter which to which...</P>


You can verify the primary by finding which three leads show as being connected on an ohmmeter...</P>

[fredy2]

Re: How do I add a 1/4 output into my organ that wasnt made with one? I Want to use an amplifier instead of the built in speakers..



I think I found the color code... the blue and green are the full primary, with the black being the center tap, as I suspected.</P>


The red and white are the secondary and will go to your jack.</P>


We step the voltage down from that given the speaker as you don't need so much to your external stuff. The transformer provides isolartion to avoid ground loops and associated hum.</P>