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Convert amplifier speaker outputs to female 3.5mm jack

post #1 of 4
Thread Starter 

Hi guys, I have a little tube amplifier that has wire outputs for speakers.

 

 

I want to be able to connect headphones instead of the speakers. I'm not quite sure how to go about this, but I was thinking strip down the ends of four rca cables and connect it in a configuration like this;

 

 

I have no idea at all. Do the cables have a ground wire that I need to connect somewhere? I undestand that the ground is inside the amp thats why the speakers don't need a ground wire. Any help is much appreciated!

post #2 of 4

Before you do anything you need to find out if the speaker (-) out can be tied together.  For single ended headphones, that would be used as the "ground".  If the amp is not differential and is only applying signal to the (+) then it'll be fine.  You'll just need a resistor divider in that case, something like 300 ohms in series with the (+) line, and 120 ohm connecting between the (+) and (-)


Edited by holland - 7/9/13 at 12:01am
post #3 of 4
Quote:
Originally Posted by XDT View Post

Hi guys, I have a little tube amplifier that has wire outputs for speakers.




I want to be able to connect headphones instead of the speakers. I'm not quite sure how to go about this, but I was thinking strip down the ends of four rca cables and connect it in a configuration like this;




I have no idea at all. Do the cables have a ground wire that I need to connect somewhere? I undestand that the ground is inside the amp thats why the speakers don't need a ground wire. Any help is much appreciated!

I use a line out converter (made for car audio) to connect my headphones to my speaker amp.
WARNING
Be cautious about amp output and headphone impedance. To much power will damage your headphones. I have 20w going into planar magnetics so I'm fine for the most part. Dynamic drivers however are not as forgiving. I got my line out converter at Best Buy for 17 bucks. It has gain settings and everything. I just screwed the grounds onto the case of the amp. I'm sure you could diy one with resistors if needed.
Edited by 24grant24 - 7/9/13 at 8:29am
post #4 of 4
Thread Starter 

Thanks guys, I just used a line out converter and it worked a treat!

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