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Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
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In 2017 when I bought my copy of Peter Keller's definitive book on the CRT I
paid $70 for it. 1) PETER WAS VERY CLEAR: HE HAS NOT GIVEN ANYONE PERMISSION TO SCAN HIS BOOK OR TURN IT INTO AN ELECTRONIC, DOWNLOADABLE, FILE (but he has made it possible to buy it at a huge discount) 2) The 6-part, 36-page article that Bill Perkins scanned on the Tektronix CRTs was originally published by the Tube Collectors Association which has since disbanded. As far as Peter is concerned we may post it to our website. It will then be accessible to more researchers and collectors there. 3) I (Dennis Tillman) also think this article should be posted to TekWiki. AND NOW FOR THE VERY GOOD NEWS: Peter's book is still available in hard cover and he has copies of to sell. Because of recent interest in it from more than five members of TekScopes I went out on a limb and asked if a discount would be available if I could guarantee him an order of at least 10 copies of his book provided I did all the work of collecting the funds and mailing the copies to our members. In his reply (BELOW) he offered our members a huge discount. The cost would be $40 + shipping if we order 10 copies or $30 + shipping for an order of 20 copies of his book. If there are 20 orders that will mean your copy will cost less than half of what I paid for my copy. Also, I believe I can even get him to autograph each copy. If there are enough orders I will collect the funds and ship each order to our members. In the meantime I will find out the most economical way to ship these. If you definitely want a copy of Peter's book contact me OFF-LIST at dennis at ridesoft dot com and include your address. Once I know what the postage will cost and how many orders we have I will know what the final price will be for each of you. Dennis Tillman W7pF From: Peter Keller Sent: Friday, November 13, 2020 9:25 PM To: dennis@ridesoft.com <mailto:dennis@ridesoft.com> Subject: RE: Inquiries about your book Hi Dennis, I have been selling them at $69.50 plus $6.00 shipping. For ten all shipped to one address at one time I would be willing to sell them at $39.50 each plus actual shipping cost. Ten copies would weigh about 25-30 pounds I believe. Twenty copies would be $29.50 each plus shipping. Peter
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Dave Voorhis
On 14 Nov 2020, at 21:58, Dennis Tillman W7pF <dennis@ridesoft.com> wrote:
… If you definitely want a copy of Peter’s book contact me OFF-LIST at dennisPer another thread, if I recall correctly there were issues with your ridesoft.com <http://ridesoft.com/> domain consistently receiving email. Have those been addressed? If not, is there an alternative email address where you can be reached?
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Hi Dave,
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Several months ago I ended up on someone's SPAM list and began receiving photos from women all over the world who would like to meet me. Since there wasn't a single Tek scope in any of the pictures I deleted the emails and marked them as SPAM. They slowly stopped sending me their pictures and, unfortunately none of them seemed to know what I was looking for in a relationship. Alas I seem to have found the only woman who will tolerate my insanity. Whether I will ever be able to convince her that marrying me was a good idea is another matter entirely. :) I have received 18 emails and 10 confirmed orders for Peter's book in the past 100 minutes so I think it is safe to say people are able to send me email. Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Voorhis Sent: Saturday, November 14, 2020 4:13 PM To: TekScopes@groups.io Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" On 14 Nov 2020, at 21:58, Dennis Tillman W7pF <dennis@ridesoft.com> wrote: … If you definitely want a copy of Peter’s book contact me OFF-LIST atPer another thread, if I recall correctly there were issues with your ridesoft.com <http://ridesoft.com/> domain consistently receiving email. Have those been addressed? If not, is there an alternative email address where you can be reached? -- Dennis Tillman W7pF TekScopes Moderator
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We have reached the first break point. I now have 10 firm orders for Peter's
book. If there are another 10 orders in the next few days (which I think is highly likely) the price will drop to $30 plus shipping. I think a week is a reasonable amount of time for me to wait so everyone has had a chance to respond to Peter's offer. If anyone has a better idea please let me know. This is what Siggi just told me when he placed his order a minute ago: <snip> PS: I've started reading the book already from the online copy, and it's awesome. It's just knocking over every question I've ever had about CRTs, one by one. Who knows what happens to the price after 20 copies? I will be happy to ask Peter if that happens. Dennis Tillman W7pF _____________________________________________ From: Dennis Tillman W7pF [mailto:dennis@ridesoft.com] Sent: Saturday, November 14, 2020 1:58 PM To: TekScopes@groups.io Notification (TekScopes@groups.io) <TekScopes@groups.io> Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" In 2017 when I bought my copy of Peter Keller's definitive book on the CRT I paid $70 for it. 1) PETER WAS VERY CLEAR: HE HAS NOT GIVEN ANYONE PERMISSION TO SCAN HIS BOOK OR TURN IT INTO AN ELECTRONIC, DOWNLOADABLE, FILE (but he has made it possible to buy it at a huge discount) 2) The 6-part, 36-page article that Bill Perkins scanned on the Tektronix CRTs was originally published by the Tube Collectors Association which has since disbanded. As far as Peter is concerned we may post it to our website. It will then be accessible to more researchers and collectors there. 3) I (Dennis Tillman) also think this article should be posted to TekWiki. AND NOW FOR THE VERY GOOD NEWS: Peter's book is still available in hard cover and he has copies of to sell. Because of recent interest in it from more than five members of TekScopes I went out on a limb and asked if a discount would be available if I could guarantee him an order of at least 10 copies of his book provided I did all the work of collecting the funds and mailing the copies to our members. In his reply (BELOW) he offered our members a huge discount. The cost would be $40 + shipping if we order 10 copies or $30 + shipping for an order of 20 copies of his book. If there are 20 orders that will mean your copy will cost less than half of what I paid for my copy. Also, I believe I can even get him to autograph each copy. If there are enough orders I will collect the funds and ship each order to our members. In the meantime I will find out the most economical way to ship these. If you definitely want a copy of Peter's book contact me OFF-LIST at dennis at ridesoft dot com and include your address. Once I know what the postage will cost and how many orders we have I will know what the final price will be for each of you. Dennis Tillman W7pF From: Peter Keller Sent: Friday, November 13, 2020 9:25 PM To: dennis@ridesoft.com <mailto:dennis@ridesoft.com> Subject: RE: Inquiries about your book Hi Dennis, I have been selling them at $69.50 plus $6.00 shipping. For ten all shipped to one address at one time I would be willing to sell them at $39.50 each plus actual shipping cost. Ten copies would weigh about 25-30 pounds I believe. Twenty copies would be $29.50 each plus shipping. Peter
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Dave Brown
The vintageTEK museum has the 6-part 36-page article that Bill Perkins scanned on the Tektronix
CRTs that was originally published by the Tube Collectors Association. It is hosted at https://vintagetek.org/tektronix-crt-history/ Dave
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OK, its official, we have reached the 20 book price of $30 + shipping.
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Meanwhile, at this very moment on eBay (item number:123833837045), Peter's book is for sale for ONLY $650. Unless that price includes an all-expenses paid trip to the Bahamas to pick up the book I don't think any of us are likely to buy it. Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis Tillman W7pF Sent: Saturday, November 14, 2020 4:52 PM To: TekScopes@groups.io Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" We have reached the first break point. I now have 10 firm orders for Peter's book. If there are another 10 orders in the next few days (which I think is highly likely) the price will drop to $30 plus shipping. I think a week is a reasonable amount of time for me to wait so everyone has had a chance to respond to Peter's offer. If anyone has a better idea please let me know. This is what Siggi just told me when he placed his order a minute ago: <snip> PS: I've started reading the book already from the online copy, and it's awesome. It's just knocking over every question I've ever had about CRTs, one by one. Who knows what happens to the price after 20 copies? I will be happy to ask Peter if that happens. Dennis Tillman W7pF _____________________________________________ From: Dennis Tillman W7pF [mailto:dennis@ridesoft.com] Sent: Saturday, November 14, 2020 1:58 PM To: TekScopes@groups.io Notification (TekScopes@groups.io) <TekScopes@groups.io> Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" In 2017 when I bought my copy of Peter Keller's definitive book on the CRT I paid $70 for it. 1) PETER WAS VERY CLEAR: HE HAS NOT GIVEN ANYONE PERMISSION TO SCAN HIS BOOK OR TURN IT INTO AN ELECTRONIC, DOWNLOADABLE, FILE (but he has made it possible to buy it at a huge discount) 2) The 6-part, 36-page article that Bill Perkins scanned on the Tektronix CRTs was originally published by the Tube Collectors Association which has since disbanded. As far as Peter is concerned we may post it to our website. It will then be accessible to more researchers and collectors there. 3) I (Dennis Tillman) also think this article should be posted to TekWiki. AND NOW FOR THE VERY GOOD NEWS: Peter's book is still available in hard cover and he has copies of to sell. Because of recent interest in it from more than five members of TekScopes I went out on a limb and asked if a discount would be available if I could guarantee him an order of at least 10 copies of his book provided I did all the work of collecting the funds and mailing the copies to our members. In his reply (BELOW) he offered our members a huge discount. The cost would be $40 + shipping if we order 10 copies or $30 + shipping for an order of 20 copies of his book. If there are 20 orders that will mean your copy will cost less than half of what I paid for my copy. Also, I believe I can even get him to autograph each copy. If there are enough orders I will collect the funds and ship each order to our members. In the meantime I will find out the most economical way to ship these. If you definitely want a copy of Peter's book contact me OFF-LIST at dennis at ridesoft dot com and include your address. Once I know what the postage will cost and how many orders we have I will know what the final price will be for each of you. Dennis Tillman W7pF From: Peter Keller Sent: Friday, November 13, 2020 9:25 PM To: dennis@ridesoft.com <mailto:dennis@ridesoft.com> Subject: RE: Inquiries about your book Hi Dennis, I have been selling them at $69.50 plus $6.00 shipping. For ten all shipped to one address at one time I would be willing to sell them at $39.50 each plus actual shipping cost. Ten copies would weigh about 25-30 pounds I believe. Twenty copies would be $29.50 each plus shipping. Peter -- Dennis Tillman W7pF TekScopes Moderator
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Hi Dave,
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I believe I first discovered Peter Keller when I came across some issues of the Tube Collectors Journal at a ham swap meet. I had some, but not all, of the series. I still have them somewhere but there is no hope of finding them at the moment in my mess. I was thinking of coming down to Beaverton. It would be nice to see Peter again but it seems like it is getting too dangerous to travel once again. If I am not mistaken Kurt Rosenfeld spoke to Peter in 2017 when I bought my copy of Peter's CRT book. I do not know what came of that conversation. Maybe Kurt can fill you in Dennis
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Brown Sent: Saturday, November 14, 2020 8:08 PM To: TekScopes@groups.io Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" The vintageTEK museum has the 6-part 36-page article that Bill Perkins scanned on the Tektronix CRTs that was originally published by the Tube Collectors Association. It is hosted at https://vintagetek.org/tektronix-crt-history/ Dave -- Dennis Tillman W7pF TekScopes Moderator
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Leon Robinson
Dennis,
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That won't even get close. When my wife and I got married in 1967 $750 covered round trip air fare from Miami and a weeks stay at the Sheraton British Colonial in Nassau. Just looked up inflation rate since then, $6850 USD Leon Robinson K5JLR
-------- Original message --------
From: Dennis Tillman W7pF <dennis@ridesoft.com> Date: 11/14/2020 10:23 PM (GMT-06:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" OK, its official, we have reached the 20 book price of $30 + shipping. Meanwhile, at this very moment on eBay (item number:123833837045), Peter's book is for sale for ONLY $650. Unless that price includes an all-expenses paid trip to the Bahamas to pick up the book I don't think any of us are likely to buy it. Dennis Tillman W7pF -----Original Message----- From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis Tillman W7pF Sent: Saturday, November 14, 2020 4:52 PM To: TekScopes@groups.io Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" We have reached the first break point. I now have 10 firm orders for Peter's book. If there are another 10 orders in the next few days (which I think is highly likely) the price will drop to $30 plus shipping. I think a week is a reasonable amount of time for me to wait so everyone has had a chance to respond to Peter's offer. If anyone has a better idea please let me know. This is what Siggi just told me when he placed his order a minute ago: <snip> PS: I've started reading the book already from the online copy, and it's awesome. It's just knocking over every question I've ever had about CRTs, one by one. Who knows what happens to the price after 20 copies? I will be happy to ask Peter if that happens. Dennis Tillman W7pF _____________________________________________ From: Dennis Tillman W7pF [mailto:dennis@ridesoft.com] Sent: Saturday, November 14, 2020 1:58 PM To: TekScopes@groups.io Notification (TekScopes@groups.io) <TekScopes@groups.io> Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" In 2017 when I bought my copy of Peter Keller's definitive book on the CRT I paid $70 for it. 1) PETER WAS VERY CLEAR: HE HAS NOT GIVEN ANYONE PERMISSION TO SCAN HIS BOOK OR TURN IT INTO AN ELECTRONIC, DOWNLOADABLE, FILE (but he has made it possible to buy it at a huge discount) 2) The 6-part, 36-page article that Bill Perkins scanned on the Tektronix CRTs was originally published by the Tube Collectors Association which has since disbanded. As far as Peter is concerned we may post it to our website. It will then be accessible to more researchers and collectors there. 3) I (Dennis Tillman) also think this article should be posted to TekWiki. AND NOW FOR THE VERY GOOD NEWS: Peter's book is still available in hard cover and he has copies of to sell. Because of recent interest in it from more than five members of TekScopes I went out on a limb and asked if a discount would be available if I could guarantee him an order of at least 10 copies of his book provided I did all the work of collecting the funds and mailing the copies to our members. In his reply (BELOW) he offered our members a huge discount. The cost would be $40 + shipping if we order 10 copies or $30 + shipping for an order of 20 copies of his book. If there are 20 orders that will mean your copy will cost less than half of what I paid for my copy. Also, I believe I can even get him to autograph each copy. If there are enough orders I will collect the funds and ship each order to our members. In the meantime I will find out the most economical way to ship these. If you definitely want a copy of Peter's book contact me OFF-LIST at dennis at ridesoft dot com and include your address. Once I know what the postage will cost and how many orders we have I will know what the final price will be for each of you. Dennis Tillman W7pF From: Peter Keller Sent: Friday, November 13, 2020 9:25 PM To: dennis@ridesoft.com <mailto:dennis@ridesoft.com> Subject: RE: Inquiries about your book Hi Dennis, I have been selling them at $69.50 plus $6.00 shipping. For ten all shipped to one address at one time I would be willing to sell them at $39.50 each plus actual shipping cost. Ten copies would weigh about 25-30 pounds I believe. Twenty copies would be $29.50 each plus shipping. Peter -- Dennis Tillman W7pF TekScopes Moderator
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In that case I definitely won't buy the book.
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W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Leon Robinson Sent: Sunday, November 15, 2020 9:44 AM To: TekScopes@groups.io Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" Dennis, That won't even get close. When my wife and I got married in 1967 $750 covered round trip air fare from Miami and a weeks stay at the Sheraton British Colonial in Nassau. Just looked up inflation rate since then, $6850 USD Leon Robinson K5JLR -------- Original message -------- From: Dennis Tillman W7pF <dennis@ridesoft.com> Date: 11/14/2020 10:23 PM (GMT-06:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" OK, its official, we have reached the 20 book price of $30 + shipping. Meanwhile, at this very moment on eBay (item number:123833837045), Peter's book is for sale for ONLY $650. Unless that price includes an all-expenses paid trip to the Bahamas to pick up the book I don't think any of us are likely to buy it. Dennis Tillman W7pF -----Original Message----- From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis Tillman W7pF Sent: Saturday, November 14, 2020 4:52 PM To: TekScopes@groups.io Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Re: [TekScopes] Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" We have reached the first break point. I now have 10 firm orders for Peter's book. If there are another 10 orders in the next few days (which I think is highly likely) the price will drop to $30 plus shipping. I think a week is a reasonable amount of time for me to wait so everyone has had a chance to respond to Peter's offer. If anyone has a better idea please let me know. This is what Siggi just told me when he placed his order a minute ago: <snip> PS: I've started reading the book already from the online copy, and it's awesome. It's just knocking over every question I've ever had about CRTs, one by one. Who knows what happens to the price after 20 copies? I will be happy to ask Peter if that happens. Dennis Tillman W7pF _____________________________________________ From: Dennis Tillman W7pF [mailto:dennis@ridesoft.com] Sent: Saturday, November 14, 2020 1:58 PM To: TekScopes@groups.io Notification (TekScopes@groups.io) <TekScopes@groups.io> Cc: 'Kurt Rosenfeld' <kurt.harlem@gmail.com> Subject: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications" In 2017 when I bought my copy of Peter Keller's definitive book on the CRT I paid $70 for it. 1) PETER WAS VERY CLEAR: HE HAS NOT GIVEN ANYONE PERMISSION TO SCAN HIS BOOK OR TURN IT INTO AN ELECTRONIC, DOWNLOADABLE, FILE (but he has made it possible to buy it at a huge discount) 2) The 6-part, 36-page article that Bill Perkins scanned on the Tektronix CRTs was originally published by the Tube Collectors Association which has since disbanded. As far as Peter is concerned we may post it to our website. It will then be accessible to more researchers and collectors there. 3) I (Dennis Tillman) also think this article should be posted to TekWiki. AND NOW FOR THE VERY GOOD NEWS: Peter's book is still available in hard cover and he has copies of to sell. Because of recent interest in it from more than five members of TekScopes I went out on a limb and asked if a discount would be available if I could guarantee him an order of at least 10 copies of his book provided I did all the work of collecting the funds and mailing the copies to our members. In his reply (BELOW) he offered our members a huge discount. The cost would be $40 + shipping if we order 10 copies or $30 + shipping for an order of 20 copies of his book. If there are 20 orders that will mean your copy will cost less than half of what I paid for my copy. Also, I believe I can even get him to autograph each copy. If there are enough orders I will collect the funds and ship each order to our members. In the meantime I will find out the most economical way to ship these. If you definitely want a copy of Peter's book contact me OFF-LIST at dennis at ridesoft dot com and include your address. Once I know what the postage will cost and how many orders we have I will know what the final price will be for each of you. Dennis Tillman W7pF From: Peter Keller Sent: Friday, November 13, 2020 9:25 PM To: dennis@ridesoft.com <mailto:dennis@ridesoft.com> Subject: RE: Inquiries about your book Hi Dennis, I have been selling them at $69.50 plus $6.00 shipping. For ten all shipped to one address at one time I would be willing to sell them at $39.50 each plus actual shipping cost. Ten copies would weigh about 25-30 pounds I believe. Twenty copies would be $29.50 each plus shipping. Peter -- Dennis Tillman W7pF TekScopes Moderator -- Dennis Tillman W7pF TekScopes Moderator
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Kurt Rosenfeld
In 2018 I got permission from Mr. Keller to extract data from one of his articles and use it here:
http://w140.com/tekwiki/wiki/Cathode-ray_tube#Classic_Tektronix_CRTs_.28info_provided_by_Peter_Keller.29 There was no discussion of any other documents or permissions.
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ChrisBeee
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
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Hi Chris,
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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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n4buq
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.
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Thanks, Barry - N4BUQ
----- Original Message -----
From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
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Chuck Harris
It has about 100 pages on TV type CRT's.
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CONTENTS Cathode-Ray Tube Fundamentals A Laboratory Curiosity RADAR Indicator Cathode-Ray Tubes Oscilloscope Cathode-Ray Tubes Monochrome Television Picture Tubes Color Television Picture Tubes Data Display Cathode-Ray Tubes Avionics and Vehicular Cathode-Ray Tubes Photo-Recording Cathode-Ray Tubes Flat Cathode-Ray Tubes... There are about 300 pages in total -Chuck Harris 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.
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Tom Lee
Hi Barry,
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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.
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n4buq
Hi Tom,
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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>
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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?
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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>
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Dave Voorhis
On 16 Nov 2020, at 17:43, n4buq <n4buq@knology.net> wrote:
Hi Tom,The three beams are dynamically and statically aligned via a set of magnets and electromagnets arranged around the neck of the tube, in addition to the yoke coils that deflect the three beams together. The beams are aimed at a photo-etched perforated barrier called a shadow mask, which is either etched with holes (conventional colour CRT) or slots (Sony Trinitron) to further refine and align the beam. The combination of the static and dynamic deflection, plus the shadow mask, ensures that each colour gun only illuminates the relevant colour phosphor dots or bars on the face of the tube. At least, that’s what I recall from about 40 years ago, which is when I last repaired colour televisions.
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I'm a bit confused about the Trinitron having "dots", the Trinitron relies on stripes and the mask is an aperture grille.
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Chuck Harris
The trinitron works in much the same way as the shadow mask
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CRT's, with their triangular gun orientation, that GE and others developed. The major difference is the trinitron uses a common gun, with three horizontally spaced, cathodes.... one for each of the red, blue, and green phosphor colors. At the screen is a grill made up of high tension parallel wires that go from the top of the screen to the bottom. There is usually a couple of wires welded horizontally at various placements to keep the high tension wires from vibrating much. The common gun has three horizontally spaced RGB cathodes, and the alignment of the beams is arranged so that they travel at slightly different angles, converging at the slots formed by the high tension shadow mask wires. Any beam that can pass through a slot between the wires can only illuminate the appropriate stripe of color phosphor. When it is in a position where it could illuminate a wrong phosphor color, it is blocked by the shadow wire. -Chuck Harris n4buq wrote:
Hi Tom,
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