Im working on a Yokagawa P9306UL, which is a striped down HL-2K a 2X 3-500Z
tube amp .. over to using a GS-35b and space is some what an issue. Using a
UHF/VHF suppression next to the tube (on the HV feed similar to the original
design/setup) is best for space constraints.
Mike
KC7NOA
> Date: Wed, 24 Feb 2010 23:19:46 -0600
> From:
> To: amps@contesting.com
> Subject: [Amps] High pass filter / was GS35B tuned input
>
> 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" <
>
> > 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).
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