>While looking through the ARRL hand book (1979) I came across an
>article for an 833a tri band amplifier. In the first part of the
>article the author says
The article seems to have survived into the 1980 edition.
>"Pi-network value are given for various surplus tubes: 4-400A, 4-250A,
>304TH and 833A.
That table covers different plate impedances depending on plate
voltage; not specific to any tube type.
>Can other tetrodes be used the same way? i.e. 4-1000, 4CX3000,
The 4-1000 may be triode connected, if the plate voltage is great
enough, though as Rich & Carl observed this circuit is a sub-optimum
methodology to use ANY tetrode.
The control grid of a 4CX series tube would likely be destroyed by
excessive dissipation in this connection should you develop sufficient
drive to obtain any practical power output.
********** and from another part of the perimeter:
>The 304TH and 833A are ...
>.... specified for grid driven, AB2 (linear) service ...
>? Where is this specified? There is no such thing as a triode, Class
>AB2 grid driven linear amplifier. . Cathode - driven, yes.
Probably in some audio application.
Nothing precludes running a triode in that class... it just wouldn't be
very efficient. More heat, less signal...
73 & Happy Monday!
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