Hey guys,
We CW ops don't worry about IMD--connect all the grids you want together.
Adjust idling current just enough so it doesn't deform the waveshape and
stop worrying :-)
K6XK/0
-----Original Message-----
From: Radio WC6W <wc6w@juno.com>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Monday, January 25, 1999 11:44 AM
Subject: Re: [AMPS] Triode conected Tetrodes
>
>Hi Art,
>
>>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,
>>4CX5000,4CX10000
>
> 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!
> Marv WC6W
>
>
>
>
>*
>
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