Adding USB out to a 600 ohm

[Quayhog]

I'm thinking of adding a USB to a separate box the would have a pair of Peerless 600:600 transformers.  I'd like to be able to hook up my analog tube mic pre amps which all have a a 600 ohm output option to a computer's USP port.

Is there a schematic that covers this, or even better is there a commercial product that would allow this.  I'm thinking Akai EIE but I'm afraid I'd over load the  mic preamps. 

 

[pucho812]

your looking to hook up your tube pres into the computer. plenty of audio interface options that have line inputs and are usb. I would highly doubt overload on an interface  with balanced line level  inputs.

 

[PRR]

A tube preamp with a 600 Ohm output surely already has a transformer output?

So run that floating winding into an unbalanced audio input on the PC or a separate ADC box.