N-P 7" with tubes and issues

[asynchronousman]

~7" National Panasonic AN-609D tubed "Speed-O-Vision"

Everything's there, nothing missing, CLEAN as a whistle, nice blue cabinet, Great CRT, audio okay, tubes light, screen shade present and set runs. I would guess around 1969 to 1971. A really neat portable in the vein of Froot-a-loop(?) and the portable 8-tracks they made in the 70s

Problems are thus: tubes glow red, flips, diagonal lines some times, tuning tricky.

Biggest problem: those three-so red tubes that are always on and put out decent sized heat! This may be a quick on set but I don't believe that's normal or good. It was removed from usage and won't be back until I can assure myself it's safe to use.

Any data and ideas are welcome.

Steven