HDMI output (1920x1080) HD for high definition multi-channel live viewing only. 1080p recording resolution is limited to a maximum of 1920x1080 per channel. Image quality and resolution is dependent on the type of camera connected to the DVR.
Neon can last decades. In practical terms the normal expected life span is between 8 to 15 years. Neon can be repaired and recharged as long as the tubing is not cracked/broken.
Output tubes are the big ones. They provide the power to drive the speakers. Since a lot of current passes through the output tubes, they do tend to wear down with usage. The lifespan depends on the tube and amp design but in general, 6L6, 5881WXT, EL34, 6V6 last about 1000 hours and EL84 last around 500 hours.