These are the best of the tubes ever made for the PVS7. Autogated, thin film, high specs, just really high quality tubes.

This one is in EXCELLENT shape, made from all new housing and lenses, with a nice minty tube, I use one of these exact tubes myself.

Feel free to compare with the others I have listed, this will perform well, but keep the overall price down by going with a used unit, solid choice for beginners.