Wiltron 640
The Wiltron 640 Scalar Network Analyzer is based on an OEM version of a Tek 5000 series mainframe.
It is not known whether they're actually compatible with 5000 series Tektronix equipment.
![](http://w140.com/tekwiki/images/thumb/6/67/Wiltron_640.jpg/267px-Wiltron_640.jpg)
The Wiltron 640 Scalar Network Analyzer is based on an OEM version of a Tek 5000 series mainframe.
It is not known whether they're actually compatible with 5000 series Tektronix equipment.