[R-390] Tubes glow blue

[Gord Hayward]

When I killed an 807 in my Viking II (screen resistor failed, B+ spiked and
there was a flash from the getter to the metal it deposited on the glass 
- the
spark cracked the glass and left a crater on the inside) the nitrogen 
glow was
pinkish.  I've seen the blue when the electrons hit glass and have 
pushed the
glow around with a magnet.  The glowing tube got mighty hot too!

Cheers, Gord VE3EOS

-- 

Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.