Suitable for loads of 500 ohms minimum and up to 50 feet typical cable
http://www.jensen-transformers.com/as/as030.pdf
12 dB Amplifier and High Current Line Driver with DC Servo
http://www.jensen-transformers.com/as/as024.pdf
High Output Line Driver for Single Ended Power Supply.
http://www.jensen-transformers.com/as/as079.pdf
This driver is suitable for loads of minimum 300 ohms and 500 feet of typical cable.
http://www.jensen-transformers.com/as/as023.pdf