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Sensibly equivalent to:
5820A/E P807
See also:
Electron Multipliers - Image Orthicon Camera Tubes
Extras ▼


The 5820 is an image orthicon 3 inch television camera tube. The image orthicon was designed in the 1940s with the objective of removing the main drawbacks in the iconoscope pick-up tube. This is an oversimplification of the development chain but in terms of practical television development is adequate.
These tubes were used for broadcast quality pictures in the most expensive cameras of the 1950s and early to mid 1960s. The image orthicon has excellent detail rendering qualities. The Plumbicon was smaller and replaced the image orthicon in broadcast camera designs from the mid 1960s.
The essential operating characteristics of the image orthicon is a low velocity scanning beam that doubles back from the target without touching it. The target is maintained at cathode potential. The beam focusing and scanning is carried out by means of electromagnetic coils around the tube. Above the base, at the right of the picture, can be seen the integral electron multiplier. A low noise signal is available as the tube's output.
The orthicon and image orthicon were both great improvements in design over the pre-WWII designs such as the Image Dissector and Iconoscope and their derivatives.
The end window envelope is 75 mm in diameter and, excluding the B14A base pins, is 368 mm tall.
References: Data-sheet. Type 5820 was first introduced in 1957. See also 1957 adverts.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 04, 2020.
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