[WSWSS] 4-250A question/WTB

[Bill Janssen]

Following this thread leaves me somewhat confused. It seams to me
that two different "grounded grid" configurations are being discussed.

There is the case of tetrode operation with the grid grounded and the
cathode
held at some voltage to derive the correct grid bias.

Then there is the case of tying the grids together so as to operate the same

as a triode with the grid grounded.

Maybe I am the only one having trouble with the explanations.

Bill K7NOM

John W Lee wrote:

> Hi Jack,
> I have an HF amp that has a pair of 4-440's in it grounded grid,  and
> have put
> 4-250's in it just to see, and they work just about the same, same
> output, etc.
> No bias, 2700 volts on the plate.  I use the 4-400's because I have some
> spares,
> and only two 4-250's.
>
> 73,
> John, K6YK
>
> On Sat, 08 Mar 2003 09:14:49 -0800 Jack Parker <w7pw@bmg50.com> writes:
> > Hopefully somone on one of the lists will be able to answer this
> > inquiry...
> >
> > I am fortunate to have acquired a pair of used but good 4-250A's
> > with
> Etc.
>
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