Your photo shows a Photo tube (Vacuum Tube).
CDS photocells are not vacuum tubes; there is no vacuum with a CDS photocell, unless the CDS photocell is either in a vacuum chamber, or is in deep space.
CDS photocells are not vacuum tubes; there is no vacuum with a CDS photocell, unless the CDS photocell is either in a vacuum chamber, or is in deep space.
Thx rkoonce,
http://www.decadecounter.com/vta/articleview.php?item=1186
Interesting piece of vacuum tube history- military circa 1955
http://www.decadecounter.com/vta/articleview.php?item=1186
Interesting piece of vacuum tube history- military circa 1955
It is very slightly like a photocell. These photo tubes were made in high-vacuum for speed (actually for talking movies, so about 1930) and slightly gassy for sensitivity (counters/chimes at store doors). Also in different color sensitivities for instrumentation and even astrophotography.
A key reference in the field: Photocells and their Application, V.K. Zworykin and E. D. Wilson
on ABE.com
Most of their applications were taken over by photo-diodes, but these are even more different than photocells.
A key reference in the field: Photocells and their Application, V.K. Zworykin and E. D. Wilson
on ABE.com
Most of their applications were taken over by photo-diodes, but these are even more different than photocells.