Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"


Colin Herbert
 

OK, I have a _very_ limited knowledge of colour CRTs, but I think the "magic" is called a "shadow-mask". The three electron guns are located in slightly different places ate the "gun" end of the tube and accelerate electrons to the phosphor screen. The shadow-mask has tiny holes in it in a matrix and the electron guns fire through these to only hit the three different colour phosphor spots that they are associated with. Does that make any sense?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of n4buq
Sent: 16 November 2020 17:43
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Tom,

My question is probably quite simple but, like I said, I'm not finding a good answer.

As I understand it (and from personal observation when I had a Trinitron TV and I'm primarily wondering about this type of CRT but the question probably applies to others), the screen has groupings of RBG phospher dots and the RGB guns "activate" those dots as needed; however, what I'm not understanding is how a given gun "activates" a given dot. Is a particular phosphor dot sensitive to a property of one of the color guns such that a blue dot ignores a red gun, etc.? If so, then I can somewhat understand it but I'm wondering if I'm way off in that assumption.

The various sites just seem to indicate there are three guns, each of which magically cause a given color to appear but it's not explained how a single color gun causes a corresponding dot to glow without affecting the ones around it.

(Hope that made sense...)

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Tom Lee" <tomlee@ee.stanford.edu>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 11:27:46 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology,
History, and Applications"

Hi Barry,

Pete's book mainly covers electrostatically deflected crts. Except for
some very early models, TVs used magnetically deflected crts (to allow
large screens without absurd set depths). The guns are similar, but the
deflection methods are very different because of the different
optimization objectives.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 11/16/2020 07:18, n4buq wrote:
Does anyone know whether this book covers CRTs that were used for color TVs
(and other color displays)? I ask because I'm not finding good
information on how those work.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
To: TekScopes@groups.io
Sent: Monday, November 16, 2020 12:15:11 AM
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology,
History, and Applications"

Hi Chris,
I don't expect any problems shipping this to Germany.

One correction:
This offer is strictly between Peter Keller and individual members of the
group. I did offer to act as the go-between because I thought there might
be
some interest and because I understood how "sensitive" our members are to
price. I was also hoping this would give Peter some well-deserved cash as
we
get close to the holidays.

So I told Peter I thought I might be able to pass along 10 orders for his
book. When he said OK I notified TekScopes. That was 36 hours ago. I have
orders for over 50 of his books as of this moment.

This brings back memories of when I asked for small donations to pay
Groups.io the annual fee for hosting TekScopes back at the beginning of
the
year. Somebody please remind me the next time I think up something like
this
to think twice about what happened the last two times I had a bright idea.
:)

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
ChrisBeee
via groups.io
Sent: Sunday, November 15, 2020 8:47 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes
Members: The Cathode Ray Tube, Technology, History, and Applications"

Hi Dennis,
I would be more than glad if I could support the group buy and get a copy
of
Peter's book, many thanks for making this possible! My only concern is if
you would ship to Germany too. I will send you a PM with my contact data.
Cheers
Chris







--
Dennis Tillman W7pF
TekScopes Moderator












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