 Cathode current question
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Uspring
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Registered Member #3988
Joined: Thu Jul 07 2011, 03:25PM
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Posts: 711
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Steve Conner wrote:
It does make sense, but bear in mind that in high gain, high power tubes the electric field due to the control grid can be much more than 1kV/cm.
The grid-cathode spacings are measured in thousandths of an inch and the grid is driven with hundreds of volts. Thank you for the info. According to my math a thin layer of 1nC/cm^2 would create a field of about 5kV/cm. That would make the possible space charge somewhat higher. Too much charge there would choke electron emission of the cathode.
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