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Re: [Amps] 2 ways of Gettering...

To: <>, "'amps'" <>
Subject: Re: [Amps] 2 ways of Gettering...
From: "Sam Carpenter" <>
Date: Wed, 14 Sep 2011 10:20:21 -0400
List-post: <">>
I think the "always-on" nature of broadcast tubes helps the seals remain
tight and inhibits in-gassing. Low voltage tubes are not as sensitive to the
gas because the arc potential is much lower with the lower Voltage. A 3KV+
B+ can arc quite a gap. 800v not so much.

-----Original Message-----
From: [] On
Behalf Of Ron Youvan
Sent: Wednesday, September 14, 2011 9:17 AM
To: amps
Subject: Re: [Amps] 2 ways of Gettering...

Roger (sub1) wrote:

> On 9/13/2011 3:40 PM, John Lyles wrote:
>> Actually the getter is there all the time and what you are speaking about
is how to reactivate the gettering process.
>> By heating "some" metallic getters such as coated plates, they attract
more ions and molecules of gas in vacuum device. Running the plate with

> Somebody actually runs glass tubes without color in the plates?

   Actually yes.  I operated a DX-100 for 2 years as a novice and there was
no heat.
I have seen a vast quantity of broadcast transmitters am and fm operating
with no detectable sign of 
red, but many did operated with red plate spots depending on how hard they
had to be pushed.
    Ron  KA4INM - Ifen my mother in law were to boil water
                  it would taste funny ... Earl Pitts 9-1-11
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