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Old 3rd January 2011, 05:10 PM   #1
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Default Line out from tube organ

I've got an old organ I would like to give a 1/4" TRS out jack to. The organ is stereo—it has one speaker for reeds and strings, and another for flutes. How would I do this?
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Old 3rd January 2011, 05:15 PM   #2
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Check for the brand and model number and post them. Someone will dig out the schematic and there will be some suggestions. I can be done! You can most likely find the schematic and post it too,. that would be even better.
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Old 3rd January 2011, 05:18 PM   #3
croat47 is offline croat47  United States
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Not sure what make and model you've got. But Captain Foldback may be of help:

Captain Foldback Organ & Amp Service
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Old 3rd January 2011, 05:21 PM   #4
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Conn 427 (technically it's a 427M, but I believe the M signifies "maple")
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Old 3rd January 2011, 05:26 PM   #5
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A fairly straightforward way would be to run a 150K resistor from each speaker's +ve terminal to the tip and ring (one for each speaker) connections on the TRS jack. The ground can be taken from the negative speaker terminals. You could also stick a pot in there to adjust the line level.

It would help to know the make and model of the organ though. And I do have a few schematics here for really old models.

Edit:
Posted before I saw the model... I'll have a look in my collection of schematics.
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Last edited by Dragondreams; 3rd January 2011 at 05:27 PM. Reason: More info...
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Old 3rd January 2011, 05:28 PM   #6
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Quote:
Originally Posted by Dragondreams View Post
It would help to know the make and model of the organ though. And I do have a few schematics here for really old models.
I just posted it above: Conn 427 Caprice.

Edit: and I posted before I saw that you saw the model
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Old 3rd January 2011, 05:34 PM   #7
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Quote:
Originally Posted by Dragondreams View Post
A fairly straightforward way would be to run a 150K resistor from each speaker's +ve terminal to the tip and ring (one for each speaker) connections on the TRS jack. The ground can be taken from the negative speaker terminals. You could also stick a pot in there to adjust the line level.
Something like this: http://www.amazon.com/KOA-Speer-Thru...f=pd_rhf_p_t_1
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Old 3rd January 2011, 05:39 PM   #8
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That sort of thing, but with a value 100 times bigger...

I've had a quick look through my pile of schematics, but I don't have anything for the Caprice.

However, running a line out from the speaker terminals is still pretty safe and straightforward. I'm just hunting for a link to an example schematic for you...
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Old 3rd January 2011, 05:46 PM   #9
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Take a look at this page and you'll see a few options for fitting a line-out socket.

Most of the ones on that page are for valve guitar amps, but the principle is exactly the same. The version shown in the middle, the "FireZog" is probably closest to what you need to be looking at. You'll need one resistor and one pot for each speaker connection.

You're probably already aware of this, but valve gear carries high voltage that is potentially lethal, even when it's not plugged in! Be careful!
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Old 3rd January 2011, 07:27 PM   #10
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The amp has a single out plug, which has seven or so cables running into it (five for the 5.25" flute speaker [a thick red, black, and yellow, and a thin red and black] and two for the 12" reed/string speaker [a thin red and black]). The plug is located right next to the two transformers. I'm a little confused about which wires I should splice on the 5.25". Any help?
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