[Top] [All Lists]

Re: [Amps]  Runaway Plate Current

Subject: Re: [Amps]  Runaway Plate Current
From: Paul Baldock <>
Date: Mon, 30 Dec 2013 07:35:04 -0800
List-post: <">>
Can you bias a Tetrode off like a Triode with a large resistor in the Cathode?

- Paul

At 02:03 AM 12/30/2013, you wrote:
I agree that biasing the control grid off is better.

Because of negative screen current, an active (rather than VR tubes or zeners) shunt regulator is best, and not difficult to do, although the heavy bleed current approach worked.

Question: Why do these modern ceramic tubes show negative screen grid current under some conditions? What is the mechanism that causes it? Straight thermionic emission from the screen seems unlikely, especially as a gold sputter would effectively prevent it.

73 es HNY

Peter G3RZP

Amps mailing list

Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>