Hi All,
I bought my 3330 a few weeks back, and while it was a little tricky to set up and get working properly, it does so now quite well. I had this problem with it that I thought might be of interest to some.
The 3330 tuner wasn't locking on stations properly and would drop out, pixcelate and mess up my recordings. When i went to unplug the thing to return it, I had to move a security camera reciever that was sitting next to it, and hey presto the picture became perfect. Moving it about 50cm was sufficient to fix the problem. Also connecting the RCA leads from the video reciever also made the picture go loopy. So, it appears the 3330 is a little interference sensitive.
Now all I am waiting on is the Dual Tuner firmware and I'm set.