poor quality in my pvr-500 amp didn't help

[Dekard]

So, I've seen some of the info on the type a and type b 500's. I've got the newer style and all the normal problems with poor signal quality. My pvr-150's are both working flawlessly. I got the 4 port radio shack amp for $50 and have tried that at the entire range of its adjustment with very minimal impact on quality. Connecting the cable feed directly results in a definate improvement although thats not a viable option for a lot of reasons.

At this point would you all recommend getting this rma'd, new drivers or i'm tempted to just get 3 pvr-150's and be done with this whole problem. I've got enough slots on my motherboard for 5 tuners and I don't like to screw around this much. What would be best?

[Dekard]

Also, I'm running linux on the server and windows on all the clients so the app won't work to fix this one. And swapping driver versions is a pita.