Chris,
Tom evidentily thinks I was confused when definately, I was not. Never once did
I say one should use contact bias. Matter of fact, if I recall, I said it
shouldn't be used in one of my posts. However grid leak bias has been used over
and over for many years. A hybrid circuit, I like to call it, is using the grid
leak set up with some negative voltage also applied to the control grid. In
this instance, a minimum negative voltage is always there to solve the problem
of the bias dwindling down to a value that wouldn't work. I've seen that used
in several amps.
The thing is, in any case for both bias arrangements, the grid goes negative
when it collects electrons from the cathode. Either bias circuit uses this
method.
Best,
Will
*********** REPLY SEPARATOR ***********
On 7/24/06 at 10:43 AM Tom W8JI wrote:
>> On Sat, 2006-07-22 at 21:04, Tom W8JI wrote:
>>> >>Actually both of you are mixing applications and very
>>> >>different systems. Contact bias or space charge biasing
>>> >>is
>>> >>NOT the same as grid leak biasing.
>>> >
>>> >
>>> > No, this actually forms the basis for grid leak biasing
>>> > where the grid collects electrons.
>>>
>>> Well, I can copy and post authoritative text in several
>>> peer
>>> reviewed textbooks written by well known authors ...
>>
>> Cool! Please do so.
>>
>> Chris
>
>
>Chris,
>
>I already posted it a couple day ago and posted the link on
>this site. I was up at 1AM doing that, so I remember it
>pretty well.
>
>http://www.w8ji.com/fusing_and_floating_grids.htm
>
>73 Tom
>
>
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