What about designing a high-pass filter attached to the grid or
cathode .... lower end somewhere around 75Mhz into a 50 ohm load to
kill vhf/uhf parasitic gain ?
Don WA4NPL
Quoting "Bill, W6WRT" <dezrat1242@yahoo.com>:
> ORIGINAL MESSAGE:
>
> On Tue, 23 Feb 2010 06:19:20 -0800, "Jim Thomson" <Jim.thom@telus.net>
> wrote:
>
>> ### a Pi net IS a LP filter. Are you sure low Q promotes instability ??
>
> REPLY:
>
> I am sure in the case of a simple parallel resonant circuit. A pi-net,
> I don't know. Have not tried one at high Q.
>
> An 8877 is an excellent candidate for a simple parallel resonant
> circuit since its input impedance is very close to 50 ohms anyway.
> Likewise for a pair of 3-500Zs. (115 ohms for a single, 57.5 for a
> pair).
>
> 73, Bill W6WRT
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