Are you running an analog or digital connection UA5 > MD?
If analog*, just head down to Radio Shack and pick up a 2xRCA > 3.5mm stereo cable.
If digital, see my previous post.
* You'll achieve better results if you can record digital out of the UA5. If you're going UA5 > MD with an analog signal, you're really doing the following:
UA5 analog input > UA5 ADC > UA5 DAC > MD ADC
Going through the UA5s ADC and then DAC process doesn't provide any benefits, and the MD ADC won't be as good as the UA5s ADC. If you do want to run digital out of the UA5, you have several options: Nomad JB3, MD w/digital inputs, DAT.