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[Amps] Runaway Plate Current

To: <>
Subject: [Amps] Runaway Plate Current
From: "Jim Thomson" <>
Date: Sun, 29 Dec 2013 23:12:25 -0800
List-post: <">>
Date: Sun, 29 Dec 2013 13:05:33 -0800
From: Bill Turner <>
To: Amps <>
Subject: Re: [Amps] Runaway Plate Current

IMO, putting a tetrode into standby by removing screen voltage is bad design
for the reason the original poster mentioned. Depending on the tube, even
zero screen voltage may not put it all they way into cutoff anyway. 

Much better to leave screen voltage applied and just bias the control grid
into cutoff.

Opinions may vary, but that's how I would do it. 

73, Bill W6WRT

##   I concur.  Im no tetrode expert, but from looking back at tetrode xcvrs  
from the
past, they all applied even more bias to cut the tubes off on RX.   On TX,
bias was switched to a lower value....for normal idling current.    The bias 
was part of the TR switching setup if I remember correctly. 

Jim  VE7RF

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