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Re: [Amps]  Runaway Plate Current

To: <>
Subject: Re: [Amps]  Runaway Plate Current
From: "Peter Voelpel" <>
Date: Mon, 30 Dec 2013 22:45:44 +0100
List-post: <">>
The use of not bypassed cathode resistors in the cathode lead of tetrodes
sometimes is done on purpose to improve IMD by negative feedback, but those
resistors are not large, around 10-15 ohms.


-----Original Message-----
From: Amps [] On Behalf Of Bill Turner
Sent: Montag, 30. Dezember 2013 21:53
To: Amps
Subject: Re: [Amps]  Runaway Plate Current

ORIGINAL MESSAGE:          (may be snipped)

On Mon, 30 Dec 2013 09:29:49 -0700, W8ZR wrote:

>What I'm
>unsure about is whether the amp might be prone to instability because of
>large cathode resistance, even near cutoff 


A large cathode resistor reduces the gain considerably compared to no
resistor, and especially so if it is not bypassed, which it should not be.
With all other factors the same, instability should be no problem at all. 

73, Bill W6WRT
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