Was Pleiades or anode bias known since at least 1962?

The elegant term is used: "operation of the grid at space potential".


Extract from an RCA unclassified report:


http://www.dtic.mil/dtic/tr/fulltext/u2/294926.pdf


Page 20.

"...Some of the measurements of transconductance which are shown later in this report are made in a special manner in that the grid is operated at approximately space potential The circuit being used to measure transconductance is shown in Fig. 4. It will be noted that the grid is returned to a positive ten volt supply through a 20 megohm resistance. This will assure a constant value of one-half microampere of grid current. The plate of the tube under test is returned to a variable positive..."


This brilliant report was found by chance today googling: penta psk9ccm nuvistor base