[Amps] High pass filter / was GS35B tuned input

[MIKE DURKIN]

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 at 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 at 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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