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Re: 577 D1 IV curve question
DW
Thanks for the replies
Refer to this link below https://groups.io/g/TekScopes/photo/255355/1?p=Created,,,20,2,0,0 The offset knob is set to 0 and the ZERO and AID switches are IN. I pushed them in and out and observed no change in behavior https://groups.io/g/TekScopes/photo/255355/0?p=Created,,,20,2,0,0 With ZERO and AID switches set in the OUT position and the offset set to 4 I am able to remove the vertical offset of the IV curve where it appears to look normal. This seems to be a new problem that has occurred recently, when I got this instrument I don't recall this problem from before.
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Re: 577 D1 IV curve question
Dennis beat me to it. Are you possibly referring to that little kink near the left side of the trace?
-- Michael Lynch Dardanelle, AR
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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
Chuck Harris <cfharris@...>
It has about 100 pages on TV type CRT's.
toggle quoted messageShow quoted text
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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Re: 577 D1 IV curve question
Hi DW,
toggle quoted messageShow quoted text
It would help if you said what you thought was odd about the curves so we knew what we were looking for. There is nothing wrong at all as far as I can tell other than the base steps are offset. To confirm this turn the silver 10 turn OFFSET pot. As you turn it the offset will change making the entire set of curves move up and down on the CRT. The odd thing is the offset button does not appear to be in the "activated" position. Try pressing this push button. It may be stuck somehow in the active position. Dennis Tillman W7pF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of DW Sent: Monday, November 16, 2020 7:26 AM To: TekScopes@groups.io Subject: [TekScopes] 577 D1 IV curve question Hello, I have a 577 D1 serial B030223 that appears to have developed a slight problem with displaying an IV curve https://groups.io/g/TekScopes/photo/255355/2?p=Created,,,20,2,0,0 If you click on the link above notice the oddly displayed IV curve, I also included pictures of the instrument settings if that is questioned Any one experience this issue before or have any thoughts, thanks -- Dennis Tillman W7pF TekScopes Moderator
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Re: Peter Keller CRT book
Hi Simon,
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Yes, I got your info and added you to the list. I will keep everyone posted via TekScopes on what comes next once the orders stop, Peter runs out of books, or I stop accepting orders in about 5 days. Dennis
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Simon Sent: Sunday, November 15, 2020 11:01 PM To: TekScopes@groups.io Subject: [TekScopes] Peter Keller CRT book Hello Dennis Did you get my request for a copy? Simon Jarman Tougnet 32100 Castelnau sur l'Auvignon FRANCE Best regards Simon Jarman -- Dennis Tillman W7pF TekScopes Moderator
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577 D1 IV curve question
DW
Hello, I have a 577 D1 serial B030223 that appears to have developed a slight problem with displaying an IV curve
https://groups.io/g/TekScopes/photo/255355/2?p=Created,,,20,2,0,0 If you click on the link above notice the oddly displayed IV curve, I also included pictures of the instrument settings if that is questioned Any one experience this issue before or have any thoughts, thanks
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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
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.
toggle quoted messageShow quoted text
Thanks, Barry - N4BUQ
----- Original Message -----
From: "Dennis Tillman W7pF" <dennis@ridesoft.com>
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Re: Q122/222 Jfet J300 subs for 2215A scope ?
charlesterrebonne@...
thanks to all who replied - the 2215A scope is off the bench for now but Ill get back to it soon and will report when I get this working...I am almost at the point of sticking a high quality transistor socket there and just trying some other close to J300 specs Jfets I have on hand...FYI all the parts I have tried in the Q122/Q222 position in the scope : 2N3918, NTE133, k19, NTE132 tested good out of circuit...i have some more Jfet #s in my stock I need to try.
From the Tektronix replaceable parts reg. : 151-1124-00 = Siliconix J-2400...would'nt be surprised this was not a custom design but more likely tested/hand picked J300s jfets and assigned a Tektronix custom part# from Siliconix...searching Siliconix j-2400 brings up nothing...Id suspect most input boards from that 22xx series scopes came off the assembly line with "J300" marked Jfets in those Q122/222 positions..thanks
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Re: Noisy/drifty S-6 head
Roger Evans
Siggi,
There are two preset pots in the S6 head for gate balance (R30) and 'gain' (R45), either could be noisy, but a more obvious suspect is the edge connector from the S6 to the 7S12 since the DC / low frequency feedback path has to travel through the edge connector. Regards, Roger
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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
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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Re: 2465B power supply spare
Jean=Paul
I have a fully-overhauled PSU available in stock Check CondorAudio website homepage, and my email is in RED, in the middle of the page. M Yachad
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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
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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Re: 7A12 attenuator board clone
Jim Ford
Thanks, Roy. I hadn't thought about how the wetting process works. I just wanted to point out that if a person is used to tin/lead solder, he or she will go WTF when first using indium solder. I should have been clearer.JimSent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Roy Thistle <roy.thistle@mail.utoronto.ca> Date: 11/15/20 11:38 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] 7A12 attenuator board clone On Sat, Nov 14, 2020 at 07:30 PM, Jim Ford wrote:>> unless a lot has changed in the last few decades, indium-based solder really> sucks!>Well... yes... technology is apt to change (for the better?), with 2 decades past.All of us are familiar with the way that tin/lead solder spreads due to its wetting. But, I.M.O. it's a mistake to project this onto other solder technologies. Spreading is a competition between the forces of surface tension (trying to ball the solder up)... and wetting (trying to spread the solder out)... and to an extent... the solder dissolving into the surface forming an inter-metallic.Because a solder does not behave like the tin/lead one we are used to, does not mean there is not a good inter-metallic formed.
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Re: 7L5 Res shaft encoder
Nenad Filipovic
On Fri, Nov 13, 2020 at 8:30 PM Jean-Paul <jonpaul@ix.netcom.com> wrote:
FREQ knob has several defective positions, 1k 2k 5kHz : Theseintermittently fault to 100k, 200k and 500k respectively. I have a 7L5 with a similar problem and it's driving me nuts. Restoration of front panel PCB sockets made no difference, so it all points to the knob (switch) being the problem. I found a few old posts on the group dealing with this issue but (someone please correct me if I missed it) no one yet dared disassemble the knob. IIRC I read somewhere else that it may crumble into zillion little pieces which are a nightmare to put back properly. I've seen a fair number of 7L5's on eBay with broken knobs; would be great if someone from our group had such an unusable one and would be willing to dissect it and photograph the process. I admit I'm a chicken to disassemble mine and possibly end up with a dead 7L5 (far from Tek homeland in Eastern Europe, where I live). Best regards, Nenad
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Re: 7A12 attenuator board clone
Roy Thistle
On Sat, Nov 14, 2020 at 07:30 PM, Jim Ford wrote:
Well... yes... technology is apt to change (for the better?), with 2 decades past. All of us are familiar with the way that tin/lead solder spreads due to its wetting. But, I.M.O. it's a mistake to project this onto other solder technologies. Spreading is a competition between the forces of surface tension (trying to ball the solder up)... and wetting (trying to spread the solder out)... and to an extent... the solder dissolving into the surface forming an inter-metallic. Because a solder does not behave like the tin/lead one we are used to, does not mean there is not a good inter-metallic formed.
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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
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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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
In that case I definitely won't buy the book.
toggle quoted messageShow quoted text
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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Re: Special Offer from Peter Keller to TekScopes Members: The Cathode Ray Tube, Technology, History, and Applications"
Leon Robinson
Dennis,
toggle quoted messageShow quoted text
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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Re: Peter Keller CRT Articles and Book. WAS: Reworked Tek' Lit
Hi Raymond,
toggle quoted messageShow quoted text
I did get it. I was surprised to see you are in the Netherlands. Marian and I have such wonderful memories of our vacation there many years ago. Dennis
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Raymond Domp Frank Sent: Sunday, November 15, 2020 8:13 AM To: TekScopes@groups.io Subject: Re: [TekScopes] Peter Keller CRT Articles and Book. WAS: Reworked Tek' Lit Attn. Dennis Tillman, I sent you a PM earlier today. Because of recent problems with email messaging I'd appreciate your confirmation that you received my message. Raymond -- Dennis Tillman W7pF TekScopes Moderator
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Re: Peter Keller CRT Articles and Book. WAS: Reworked Tek' Lit
Attn. Dennis Tillman,
I sent you a PM earlier today. Because of recent problems with email messaging I'd appreciate your confirmation that you received my message. Raymond
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