I have a Formac Studio TVR. Its probably a few years old but I used it a long time ago to painstakingly record TV episodes to a Powerbook G4 12″.
As a firewire device on Linux, it works as a DV capture device. So if you have one of these lying around, it works. Just make sure to do the following:
While there is an analog TV tuner on the Formac, there is no mention of how it is operated, nor is there any documentation about how to control it.