Everything you ever wanted to know about plumbicons including diode guns (page 7). Courtesy of Naragansett Imaging. They stopped mfg of tubes but still carry some stock. They might be nice guys and answer your sub question.
http://www.nimaging.com/products/no_...0Operation.pdf
And this is lifted from an non-working website found on Google;
"Diode-gun Plumbicon tube has modulator grid which is operated with positive voltage w.r.t. the cathode, as in a vacuum-tube diode."
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
Last edited by Dave A; 11-15-2012 at 05:41 PM.
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