----- Original Message -----
From: "Chris Howard" <chris@yipyap.com>
To: <amps@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.......................................
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