[Amps] grid fuses

[Michael Tope]

----- Original Message ----- 
From: "Chris Howard" <chris at yipyap.com>
To: <amps at contesting.com>
Sent: Thursday, July 20, 2006 4:56 PM
Subject: Re: [Amps] grid fuses


> On Thu, 2006-07-20 at 19:26 -0400, Tom W8JI wrote:
>> If we suddenly yank the grid off ground while the grid is too hot, 
>> it will rise towards anode potential. That isn't good news 
>> when HV is still there and the cathode is grounded. 
> 
> I thought we were talking grounded grid?
> If both the cathode and the grid were grounded, how
> did the thing ever work?

The cathode is typically connected to ground through the cathode bias 
network (zener diode in series with bias cutoff resistor/shorting relay) 
and the grid current return resistor (the grid current component of the 
cathode current has to have a DC return to ground). 

73, Mike W4EF.......................................