[Amps] Ferrite-loaded plate choke

[wc6w at juno.com]

-- "DF3KV" <df3kv at aol.com> wrote:

<snip>

> http://lists.contesting.com/archives/html/Amps/1998-10/msg00480.html
>
>   If you fabricate the entire Pi-L coil from RG-402 then the
>effective impedance at the plate choke will be circa 50 ohms.  I am
>using this latter method with a pair of 4CX600's in an amp currently
>under constuction.
>
>Hi Marv,
>
>How can the effective impedance at the top of the plate choke be 50
>Ohms,  when the tube output impedance represents for instance 2 KOhm
>at the same connection?
>
>73
>Peter


Hi Peter, 
  The "plate" choke is connected to the "output" (center conductor of the coil) of the pi-net which will be transformed to a low impedance as is the antenna connection.

  It may be easier to visualize if you draw the circuit as described in the old link.

73 & Good morning,
  Marv WC6W



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