[AMRadio] 807's triode connection question...

[Mike Dorworth]

The grid to screen connection is used to make the tube act as a zero bias
class B tube instead of class ab1 or ab2. the drive requirement is low but
the voltage required is high hence regular class b driver transformers can
not be used.

The triode connecton is used for class A /


THE 100 ohm resistor is used in the modified Williamson connection..




----- Original Message -----
From: <ka1iic at prexar.com>
To: <amradio at mailman.qth.net>
Sent: Thursday, July 04, 2002 6:01 AM
Subject: [AMRadio] 807's triode connection question...


> Hi guys me again,
>
> I've been looking up all the info I can get about using 807's in triode
> connection....
>
> I have found 3 different cases and was wondering about the benefits of
> each....
>
> First off the older ARRL handbooks show connecting the grid to the screen
> through a 20k ohm resistor and driving the screen...
>
> Another publication shows connecting the screen to the plate directly and
> driving the grid as you normally would...
>
> And case three shows connecting the screen to the plate through a 100 ohm
> resistor and driving the grid as per the norm...
>
> Any guidance is welcome...  any comments welcome also...
>
> Thanks in advance
>
> 73
> Vince
> ka1iic
> -.--.
>
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> AMRadio at mailman.qth.net
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>


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