[Amps] Tube 201

[Will Matney]

John,

Where did I flip flop? I've always said a grid could not become positive from the methods being discussed. So did Terman if any will read the same edition I have. Nowhere in the 1st edition, which I have, says a grid became positive. It only says "less negative". The quote I made is exactly word for word what was in print except for one mispelled word I caught. Once one reads this whole section on gassy tubes, and the one that talks about space charge, you can see what is really meant. There's only one possible cause of a grid ever becoming positive, and that is only for part of a cycle from a grid being driven into that region by the incoming signal. I posted this earlier, and wha was said about it. The only other would be to purposely place a positive potential on the grid. Were not talking about this here, only about what would happen with a gassy tube or about a grid which is floating. When Terman says suddenly positive, it means suddenly more positive than what it was at that moment. It would never go above ground potential or 0 Vdc from electron flow. He says this in various other places in the book. One has to read the whole chapter on vacuum tubes to see all of this. One can't be like some preachers and take one verse from the Bible and say it means something else. If you read before and after the verse, you find that it meant something totally different than they professed. I've seen this happen before. By what Tom says, Terman is flip flopping, or was wrong. Did he lie. the first time? Some how, I don't think so.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 7/24/06 at 9:21 PM John Vickers wrote:

>----- Original Message ----- 
>From: "Will Matney" <craxd1 at verizon.net>
>Nowhere in the whole paragraph about gassy tubes (Effect of Gas upon Tube 
>Characteristics) which is under part 13, page 316 in this book, says a
>grid 
>became positive! It only says this can cause a grid to become "less 
>negative"!
>
>Will;
>Anytime I become less negative, I  become more positive. And I'm VERY 
>POSITIVE you should go back and read Richs free advice to you in his post
>of 
>7-20-06 sent at 9:47 PM. You're starting to "Flip Flop" like Kerry. :>)
>
>73, WA4TT