|
Re: 2430a carrying handle and face cover
I also need to buy a 2430a carrying handle and face cover.
toggle quoted messageShow quoted text
I have lots of the 2430/2430A scope parts. contact me offline if interested. electronixtoolbox at gmail dot com Craig
On Jan 26, 2020, at 8:04 PM, Terry Gains <terry.waihi@gmail.com> wrote:
|
|
|
|
A piece of gear I would like to move on
Eric
Does anyone have an interest in a Tektronix CMD80? It is not a scope but it is tek branded. Mine came broken but mostly optioned up. I think it has 75% of the options installed. I can take pictures if anyone would like? It has been repaired.
|
|
|
|
Re: Guernsey Island 2445
There have been a few times when Håkan looked up the cross referencesI just bought a Guernsey manufactured 465 s/n 103496. I will need to crack it open and see what I have. Hope it is a "Late" series (but probably not). Seems crazy that they would not sync their serial numbers across all the production sites, since so many parts of these instruments are Serial number sensitive? -- Michael Lynch Dardanelle, AR
|
|
|
|
Re: Where have all the Schematics Gone?
Dennis,
You hit the nail on the head! -- Michael Lynch Dardanelle, AR
|
|
|
|
Re: Type O plugin with Power Supply
Glenn Little
Link to picture.
toggle quoted messageShow quoted text
Can take more if interested. https://groups.io/g/TekScopes/photo/239601/0?p=Created,,,20,2,0,0 Glenn
On 1/26/2020 9:03 PM, Dennis Tillman W7PF wrote:
Groups.io strips out anything that isn't simple text. The photo didn't make it in your message. --
----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"
|
|
|
|
Re: 2430a carrying handle and face cover
Terry Gains
I also need to buy a 2430a carrying handle and face cover.
This for a 2430a with Tekmate restoration. The carrying handle and face cover are needed for portability and completion. Kind regards, Terry G
|
|
|
|
Re: Type O plugin with Power Supply
Groups.io strips out anything that isn't simple text. The photo didn't make it in your message.
toggle quoted messageShow quoted text
Easiest thing to do is put your picture in the photos section of TekScopes, copy the link and send your post again including the URL for the photo. Dennis Tillman W7PF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Glenn Little Sent: Sunday, January 26, 2020 4:39 PM To: TekScopes@groups.io Subject: [TekScopes] Type O plugin with Power Supply Many years ago I bought this from Deane Kidd. It has been in my back room since. The plugin is serial 000096. Serial 000098 sold for $100.00 as a parts unit. The power supply has no type number on it. I suspect that is may be a prototype. The power supply is missing at least two tubes and one transistor and has no cover. A picture is attached. I would like to get $100.00 plus shipping for the plugin and power supply. Is anyone interested? Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license" -- Dennis Tillman W7PF TekScopes Moderator
|
|
|
|
Re: TEK514 needs new 5V4G tube
Hi Steve,
toggle quoted messageShow quoted text
Is there any reason you can't buy a 5V4G? There are 123 of them on eBay at the moment. Prices start at $12 for them and go up. I can test it for you to confirm its good if want to send it to me. Dennis Tillman W7PF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Richard Solomon Sent: Sunday, January 26, 2020 4:33 PM To: TekScopes <TekScopes@groups.io> Subject: Re: [TekScopes] TEK514 needs new 5V4G tube This may be blasphemy, but you could replace the rectifier tube with a couple of diodes. You may need a small resistance to adjust for the lower voltage drop in the diodes. 73, Dick, W1KSZ On Sun, Jan 26, 2020 at 4:34 PM Roy Morgan <k1lky68@gmail.com> wrote: Steve, -- Dennis Tillman W7PF TekScopes Moderator
|
|
|
|
Re: TEK514 needs new 5V4G tube
Harvey White
Considering the cost for a 5V, which IIRC is a rectifier with an indrectly heated cathode (*many* years ago). You might want to take some silicon rectifiers and put them in, substituting for the 5V4. You may get a bit hotter B+ out of the combo, and I've heard that some people put some fairly large wattage resistors in series to limit the surge, but I'd certainly consider that fix for AU $45.00. (which even at the last rate I remember is USD22.00 and that's a big bunch). I suspect that 1N4006 might be a good candidate.
toggle quoted messageShow quoted text
If you had an octal tube base you could build it into that. Harvey
On 1/26/2020 6:10 PM, Steve Hendrix wrote:
Okay, it's a "valve" for our limey friends!
|
|
|
|
Type O plugin with Power Supply
Glenn Little
Many years ago I bought this from Deane Kidd.
It has been in my back room since. The plugin is serial 000096. Serial 000098 sold for $100.00 as a parts unit. The power supply has no type number on it. I suspect that is may be a prototype. The power supply is missing at least two tubes and one transistor and has no cover. A picture is attached. I would like to get $100.00 plus shipping for the plugin and power supply. Is anyone interested? Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"
|
|
|
|
Re: TEK514 needs new 5V4G tube
Richard Solomon <dickw1ksz@...>
This may be blasphemy, but you
toggle quoted messageShow quoted text
could replace the rectifier tube with a couple of diodes. You may need a small resistance to adjust for the lower voltage drop in the diodes. 73, Dick, W1KSZ
On Sun, Jan 26, 2020 at 4:34 PM Roy Morgan <k1lky68@gmail.com> wrote:
Steve,
|
|
|
|
Re: Your generosity is STUNNING!
Hi Michael,
toggle quoted messageShow quoted text
A bank account is definitely something we have to do. It is a little tricky because Michael is in Canada and I am in the US so we have to be sure we comply with the laws of both nations. We also need to put it in an account where currency variations won't adversely affect it. That would probably be the US. In April 2011 it cost $0.95CD to buy $1.00US. The Canadian dollar was worth more than the US dollar. Today it costs $1.32CD to buy $1.00US. A Canadian dollar is worth $0.76US. Since Groups,io is in the US it might be easier to have the bank account in the US. I am hopeful Groups.io will implement a payment option that would let us pay 5 years at a time. That would be even better. Michael Dunn says I shouldn't hold my breath. Dennis Tillman W7PF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Michael A. Terrell Sent: Sunday, January 26, 2020 12:20 PM To: TekScopes@groups.io Subject: Re: [TekScopes] Your generosity is STUNNING! Why not set up a bank account for it, and Autopay for Groups.io? It could also be used to fund group purchases for custom made replacement parts, when you are short a person or two. Put the money back into the account when the extras are sold. We did this for a computer club, in the '80s. It was registered as a non profit, but it wouldn't be difficult to do that for a group this size. On Sun, Jan 26, 2020 at 12:46 AM Dennis Tillman W7PF <dennis@ridesoft.com> wrote: Hi Raymond, -- Dennis Tillman W7PF TekScopes Moderator
|
|
|
|
Re: Tek CRTs supplied to competing manufacturers
This is documented in the book: Winning With People: The first 40 years of Tektronix by Lee.
toggle quoted messageShow quoted text
Dennis Tillman W7PF
-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of george gonzalez Sent: Sunday, January 26, 2020 11:55 AM To: TekScopes@groups.io Subject: Re: [TekScopes] Tek CRTs supplied to competing manufacturers I think it was the other way around, Tek used to buy CRTs from Dumont and RCA but found out they were getting the below average CRTs. This came to light when some university bought like 50 CRTs and some alert Tek person noticed the tubes were not in serial number order and they all were extremely bright and sharp, better than the ones sent to Tektronix. This spurred Tek to start up their own CRT factory. Expensive but had superb results. On Friday, January 24, 2020, Greg Muir via Groups.Io <big_sky_explorer= yahoo.com@groups.io> wrote: Thanks, Dennis. -- Dennis Tillman W7PF TekScopes Moderator
|
|
|
|
Re: TEK514 needs new 5V4G tube
Roy Morgan
Steve,
toggle quoted messageShow quoted text
I would strongly suspect a shorted filter cap in that supply. If you have an external variable B+ supply, bring the voltage up VERY SLOWLY at the tube cathode while monitoring the current. (Scope power off) Roy Morgan K1LKY Western Mass
On Jan 26, 2020, at 6:10 PM, Steve Hendrix <SteveHx@hxengineering.com> wrote:
|
|
|
|
Where have all the Schematics Gone?
Message #163848
Sent: Sunday, January 26, 2020 9:20 AM Subject: Re: [TekScopes] 11801 questions - funny fan noise and light Ragnar asks: Are there any schematics on these [11801] boxes to be found? By the 1960s Tek's Service Manuals (SM) were the finest in the industry. They were a major selling point for Tek products. They were specifically designed to give you all the information necessary to fix the instrument. With the SM it was relatively inexpensive to maintain Tek instruments in calibrated condition for a long time after they were purchased. The longer those instruments could be maintained in good condition the lower the Total Cost of Ownership (TCO) for the company that owned it. Eventually someone would realize that the SMs were adversely affecting sales. With such good SMs no one was in a hurry to buy new instruments from Tek when it was easy to keep their old instruments calibrated and working perfectly. In the mid-1980s someone in management did realize that Tek could make more money by NOT including schematics in their service manuals. By the time the 11000 series of scopes appeared in 1986 schematics were banned from the Service Manuals for new products. As far as I know there are no schematics available anywhere for the 11K scopes. I tried on one occasion to get the set for an 11K scope from someone at Tek but they were unable to locate them. Since then Tek has tightly controlled the schematics for all of the 11K scopes and probably all other products as well. If a schematic set were ever to escape from Tek's "clutches" and be released "into the wild" for a supported product then returning it to the factory for repair would not be the only way to get it fixed. The disappearance of the schematics from Tek's service manuals was impossible to miss when it happened. It occurred during a period in the latter half of the 1980s when Tek was struggling financially with layoffs, spin-offs, and decreased earnings almost every quarter. When a product support department is a Cost Center the company recognizes that good support is an intrinsic cost of producing a good product. The company can charge more for its products because of the superior support provided for them. The cost associated with providing this support is recouped indirectly by a higher price the customer will pay for a well-supported product. When a product support department is a Profit Center it is expected to generate revenue for a company by charging for support. This change will help a struggling company's bottom line for a few years - which was probably why Tek chose to do it in 1986 - but eventually it will result in a loss of customers and greater competition. In other words, this will come back to bite you one day. Presumably the manager who is credited for this great idea will also know he has a few years to find a job elsewhere before the real damage he has done becomes apparent to the board. Why did Tek remove the schematics? * Without schematics Tek products have to be returned to the factory or nearest repair center for repair. This is inconvenient for the customer because travel time back and forth can be greater than the repair time. It is dangerous because the instrument can be damaged in transit. It is expensive to crate up and ship a large, heavy instrument. In addition, since the factory has a monopoly on repairs, they can charge more than the customer's in-house repair department costs. This increases the customers TCO. Tek makes money but it is at the expense of the customer who eventually will realize that Tek products are becoming as expensive to own as other similar products from HP, LeCroy, etc.. * More importantly, without schematics, Tek can arbitrarily shorten the useful lifetime of their products by declaring a product obsolete and ending the repair service for it each time they introduce a new product that improves on the old one. By no longer providing repair service for obsolete products customers can be pressured to purchase the new replacement the next time their existing instrument breaks. Tek makes more money by selling new products to replace the old ones they will no longer repair. The customer's TCO goes up a lot in this scenario. Each time the TCO goes up for the customer it encourages him to look at competitive products and even low cost products from places like China which do not have the engineering excellence Tek is (was?) famous for. By making support a Profit Center Tek makes more money in the short term but loses customers in the long term when they purchase competitive products with a lower TCO. In the very long term Tek loses the low end segment of the market to new competitors who see an opportunity to enter it with 1) products that are cheaper than Tek can make, and 2) products the customer can justify buying because they understand it was meant to be recycled rather than repaired when it eventually breaks. The TCO is irrelevant for throw away products. In the very long term, supporting customers with a Profit Center model, will drive customers to reputable competitors with similar products that offer them a choice of in-house support vs. Tek Profit Center support. Some customers will realize they have another choice - buy an inexpensive throw-away instrument for 1/4 to 1/3 of the price Tek charges. This creates more competition at the low end of the marketplace where the profit margin has eroded so deeply that Tek is no longer competitive. Dennis Tillman W7PF
|
|
|
|
Re: Scope tester on Ebay
Miguel Work
|
|
|
|
Re: Tek CRTs supplied to competing manufacturers
On Sun, Jan 26, 2020 at 11:56 PM, Greg Muir wrote:
From "Winning with People; The first 40 years of Tektronix", page 12: "Why did Tek make its own cathode-ray tubes? Because neither Dumont's nor RCA's were good enough and Tel thought it could do better". Raymond
|
|
|
|
TEK514 needs new 5V4G tube
Steve Hendrix
Okay, it's a "valve" for our limey friends!
Today I was able to do some more troubleshooting with my dad and my sons, on Dad's TEK514. I took along my thermal camera to help track down the short that was blowing the inlet fuse. Turned out i didn't need it, but it helped confirm. One rectifier tube right next to that monster power transformer started getting extra hot within seconds of power-on, and then started arcing and making a nice arc lamp. I've done a bit of searching and it seems the audiophiles like these tubes; the best I could find was AU$55 for a pair on eBay. Dunno how much shipping would be from down under. Fairly simple fix, to swap out a tube - if that's the only problem. But we checked all the electrolytic caps with an ohmmeter and none seemed to be shorted nor open. Looking for any thoughts on a good source for the tube, and/or whether it's a worthwhile fix. Steve Hendrix
|
|
|
|
Re: Tek CRTs supplied to competing manufacturers
Greg Muir
George,
toggle quoted messageShow quoted text
Do you or anyone else have a copy handy of "Winning with People; The first 40 years of Tektronix" to confirm this? I can’t seem to find my copy at the moment. Thanks, Greg
On 01-26-2018 at 12:55 pm George Gonzales wrote:
“I think it was the other way around. Tek used to buy CRTs from Dumont and RCA but found out they were getting below average CRTs….”
|
|
|
|
Re: 11801 questions - funny fan noise and light
Hi Ragnar,
toggle quoted messageShow quoted text
Maybe Tek switched to these kinds of fans to make their instrument more energy efficient. With the heightened interest in being ecologically responsible many companies, like Tektronix for example, have made a concerted effort to make their equipment more efficient. Every watt used by any electronic device ultimately ends up as heat that other machines (like fans and air conditioners) have to remove. The engineers designing new equipment know the savings that will come from every wasted watt they can eliminate result in a savings of several watts. Temperature sensing fans save power by not running at all until needed and then only running as fast and as long as necessary to remove the heat from the instrument. Dennis Tillman W7PF
-----Original Message-----
From: Ragnar S Sent: Sunday, January 26, 2020 9:20 AM To: TekScopes@groups.io Subject: Re: [TekScopes] 11801 questions - funny fan noise and light Thank you gentlemen for your replies! So it is unclear if it is supposed to do this, but it is at least not unheard of. I checked the voltages on the feed wires to the fan relative chassis ground. From start, the positive wire has about +6.3 V and the negative about +0.7 V. When the fan revving occurs, the negative wire goes to about -6 V for about 35 ms, making a total voltage over the fan of about 12 V. For some reason the pulses come irregularly, around 1 or a few times per second. My current hypotheses is that the intention is to regulate the speed of the fan, but I would be surprised if this actually is how it was designed to work. It is somewhat annoying. :-) Are there any schematics on these boxes to be found? Also - the neon (?) light in the power supply, right behind the fan, that starts to flicker as soon as it has power (also in standby mode) - do you guys have that too? Thanks for you help and best regards, Ragnar On 25 Jan 2020, at 16:01, Chuck Harris <cfharris@erols.com> wrote:investigate anything I can't identify, so I think I would have noticed it. to reduce the heat in the room and when I tried to boot it the fan was dead. I've not had time to correct it yet.
-- Dennis Tillman W7PF TekScopes Moderator
|
|
|
