at the risk to state the obvious:
A LPF of a solid state PA has 50 Ohms in- and output impedance.
A tube type PA needs a LPF which transforms from several kOhms on the tube side
to 50 Ohms at the output.
Therefore the values for the lumped reactances differ considerably from the
Moreover design parameters like optimum loaded Q for the needed flyweel effect
etc. come into play.
The ARRL Handbook,also old versions, cover this subject in depth.
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Chris Wilson
>Sent: Thursday, August 03, 2017 4:19 PM
>To: [email protected]; [email protected]
>Subject: LF: LPF for a valve based (tube based) LF amp?
>My next contemplated project is a GS35B valve based LF amp. I have the
>HT supply, a couple of GS35B's to play with and a suitable filament
>supply. My question is can I build an air wound LPF based on exactly
>the same values as the one I use on my W1VD FET based Class D amp?
>That gets pretty warm and I use a small PC processor fan on the centre
>toroid, but I am unsure if the filter characteristics are specific to
>a FET based amp in some ways?
>W1VD amp schematic here: http://www.w1vd.com/137-500-KWTX.html (1
>kW amplifier) http://www.w1vd.com/137-500-KWRev3.0.pdf
>W1VD LPF details here: http://www.w1vd.com/LPF.html
> Chris mailto:[email protected]
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