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Re: [Amps] More on "baby ur radio"

To: "Bill Turner" <>, "Amps group" <>
Subject: Re: [Amps] More on "baby ur radio"
From: "Jeff AC0C" <>
Date: Sat, 19 Dec 2015 22:40:28 -0600
List-post: <">>
Migration is a real phenomenon but it's a quality defect, and not part of the normal operation. Google "purple plague."

I am interested to see if there are any data specific to idle hours on a power transmit tube. The filament issue and thermal heat/cool is something I can wrap my head around easily. But a cathode setting there at op condition, B+ applied to the anode - but with the tube otherwise undisturbed - what's the actual wear mechanism?


-----Original Message----- From: Bill Turner
Sent: Friday, December 18, 2015 2:50 PM
To: Amps group
Subject: Re: [Amps] More on "baby ur radio"

------------ ORIGINAL MESSAGE ------------(may be snipped)

On Fri, 18 Dec 2015 00:59:04 +0000, Charly wrote:

P.S., next question is "do transistors 'wear out'?"

Good question. I heard years ago that over long periods of time some
of the molecules in a transistor could "migrate" to undesired areas,
so in that sense, they do "wear our". True or not true?

Even if true, my experience is they far outlast tubes provided they
are protected against over voltage and current.

73, Bill W6WRT
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