[hsusmann]

Conelrad,

OK, that is interesting. I suppose there are a couple of failure/wearout
modes going on:

1. Cathode emissions decline with use
2. Phosphor degradation with normal use

I wonder if some of the phosphor degradation might not come
from ion bombardment rather than electron bombardment.
As far as I know there is no mechanism in these tubes to
divert the ions away from the screeen as in old style CRTs
with the ion traps etc...

And now this about sunlight on the phosphor. I had not thought
about that one!

Thanks,

Herb