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Re: Info: 564B found FS in Wollongong, Australia
Phil (VA3UX)
564B's typically sell for around $50 on eBay.
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Phil At 01:08 PM 1/20/2002 -0800, you wrote:
Right, this bargain of $80US will turn into $280US when you include |
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Re: WTB: Tektronix 7D01 w/DF1(or DF2)
Hello Ashton,
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My limited experience with bad electrolytics in Tek scopes was that there is no capacitance. I would guess, the problem was discontinuity rather then drying out, because failure has been sudden, every time. In view of that, I wander how much help would be an ESR meter. However, I am looking into building one myself and would be interested to see what method you are using. Let me know, please, and if you have the schematic in a convenient form to e mail, please do so. A rough sketch showing only the principle is good enough, too. Regards Miroslav Pokorni ----- Original Message -----
From: "Ashton Brown" <ashtonb@...> To: <TekScopes@...> Sent: Friday, January 18, 2002 10:34 AM Subject: Re: [TekScopes] WTB: Tektronix 7D01 w/DF1(or DF2) Apropos - I sold one of [the pair] to a person in Spain via eBay, manyfor the whole lot. There are three sets for sale right now on US Ebay. |
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Re: WTD: 7704A Power Supply
Hello Lyn,
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A couple of years ago I bought a 7904 and it turned out that one of those slot connector bodies was completely missing. Fortunately, all (needed) pins were undamaged so I could slide the plug in; of course, the slot did not work. I bought replacement connector body from Tektronix and price was not unreasonable as one would expect, if I remember it correctly, the price was around $5 per piece. The body just slides over pins (a care not to bend pins is very helpful). With new body, pins got proper tension and the same slot worked. You might want to try Tek spare parts. Bear in mind that not all people working there are the same, some of those ladies were going way out of their way to help out, while some others told me very curtly that instrument is no longer supported; in both cases the query was for 7904 parts. What I meant with 'going way out way.' was using listings that were either off line or just plane hard copy listings. I wander if Walter (of Sphere) would be willing to trash a scope backplane to extract connector bodies. That backplane would have to be burned up badly or cracked to make it a viable business. If I remember it right, body slides on easily but that is one way process, removing the body would damage pins. ----- Original Message -----
From: "Lynn Lewis" <mrzuzu@...> To: <TekScopes@...> Sent: Friday, January 18, 2002 4:12 AM Subject: RE: [TekScopes] WTD: 7704A Power Supply Don, that sounds like some very good advice. I'll look for replacementsfor awhile before I disassemble it. By the way, guys, I'm going to sell ita scope to use them on, give me a ring.and myis that these contact tensioning covers are nylon, snap fit into place, andfrom anyone currently selling Tek parts: Sphere Research, Surplus Sales,Deane Kidd, plus the couple guys who keep showing up on ebay with new Tekparts. Ithink andup a |
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Re: Info: 564B found FS in Wollongong, Australia
Right, this bargain of $80US will turn into $280US when you include
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shipping. Regards Miroslav Pokorni ----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...> To: <TekScopes@...> Sent: Friday, January 18, 2002 1:25 AM Subject: RE: [TekScopes] Info: 564B found FS in Wollongong, Australia itsale in the "Cash-Mart" second-hand shop in Wollongong a coupleEr - OK, Wollongong is in Australia, right? So $165 is Aussie dollars? up. If I wasn't on the other side of the planet, that is :-) |
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Imitation Tek
Michael
Hi all,
I was talking to a friend yesterday, who is originally from Vietnam. He recounted the story of how he was drafted to work for the communists in some research project or other in the 60's. Among the equipment he was given to work with was a russian copy of a Tek 5-series scope. He said it had the Tek "style" and the layout was the same, only the colours were a little different and the labels were all in russian. Also, he remembered the knobs were larger and more roughly-made than a Tek. Anyone else heard of this? Regards, Michael |
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File - Posting Rules
Please edit any posts/replies to the list to
minimize quoted material. Please do not send personal replies to the list. List replies go to the list by default. To reply only to a message's sender, either cut and paste their name, reply to all and delete "TekScopes", or use a reply-to-sender function if your email client has it. Those congesting the list with with either of the above will have posting rights revoked or moderated. Only by following these simple rules will we have a "clean" archive. They also reduce inbox clutter and make digests much nicer to read. If you do not wish to belong to TekScopes, you may unsubscribe by sending an email to TekScopes-unsubscribe@... You may also visit the Yahoo web site to modify your subscriptions: Check out the files, bookmarks, and photos sections, and remember, you can search the group's archives from its home page, or when reading messages. The group's home is at: Regards, Michael Dunn Moderator, TekScopes |
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Re: WTD: 7704A Power Supply
Lynn Lewis
I'm glad you said that before I started trying to "fix" the focus on my
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7704A. I really was thinking about it. I did, by the way, find a backplane that is being shipped to me so that I can attempt to repair the plugin connectors. -----Original Message-----
From: Stan or Patricia Griffiths [mailto:w7ni@...] Sent: Saturday, January 19, 2002 5:36 PM To: TekScopes@... Subject: Re: [TekScopes] WTD: 7704A Power Supply This is also partly due to poor focus in 7K CRT's in general since they use the mesh screen technology . . . The typical "spot size" of a 7K CRT is several times larger than that of a 453, 547, or 585A for example. Stan w7ni@... donlcramer@... wrote: > "....It is a long time since I used a 4-bay Tek scope, but I recall that the > readout vibrated up and down a little too (it was either a 7704 or a 7904 - I > forget which now)...." > > Craig > --------------- > It seems the on screen readout, while a brilliant feature, is never quite > perfect. For instance, the character focus and/or astig never seems to be > quite sharp, and it varies depending on screen location in some models. Part > of the wonderful character of the scopes I suppose. > > Don > > > > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@... > > > > Your use of Yahoo! Groups is subject to Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: WTD: 7704A Power Supply
Lynn Lewis
I'll keep you in mind. It may yet come to that.
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-----Original Message-----
From: jcastanton [mailto:jstanton@...] Sent: Saturday, January 19, 2002 3:04 PM To: TekScopes@... Subject: [TekScopes] Re: WTD: 7704A Power Supply Lynn, I have a 7704A in good shape except that it has a weak tube. If you decide to part out your 7704A and it has a good tube, I would be interested. --- In TekScopes@y..., "Lynn Lewis" <mrzuzu@j...> wrote: > Okay, guys. Here's the deal. I have the 7704A working but I need some > advice. Slot 1 is unusable and slot 3 is unreliable. All the switches and > controls have been cleaned and work smoothly. All the panel lights work. > Go here to see the scope: > > > Is there a way to repair the slots? I can either try to repair them or else > I can break the scope down into parts and sell the parts. Dick already wants > a power supply. Does anyone else need any boards? Except for the slots, you > can see that the scope works. The readouts have a slight ripple so there's > probably a weak filter cap somewhere but it's not bad and it doesn't show up > on the trace. I would be happier with a more focused trace but it's not as > bad as > it appears in the photos. > > Fix it? Or, break it down? What do you think? > > > > > > > > -----Original Message----- > From: w1ksz [mailto:w1ksz@t...] > Sent: Wednesday, January 16, 2002 5:23 PM > To: TekScopes@y... > Subject: [TekScopes] WTD: 7704A Power Supply > > > I have a very clean 7704A with a sick Power Supply. Anyone have one > they will part with ? > > Thanks, Dick, W1KSZ > > > Yahoo! Groups Sponsor > ADVERTISEMENT > > > > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@y... > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > > Yahoo! Groups Sponsor ADVERTISEMENT To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: WTD: 7704A Power Supply
Stan or Patricia Griffiths
This is also partly due to poor focus in 7K CRT's in general since they use the
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mesh screen technology . . . The typical "spot size" of a 7K CRT is several times larger than that of a 453, 547, or 585A for example. Stan w7ni@... donlcramer@... wrote: "....It is a long time since I used a 4-bay Tek scope, but I recall that the |
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7000 Series Readout Jitter
Stan or Patricia Griffiths
One of the things that causes readout jitter is one of the
scope traces positioned way off screen up or down. You have to recall that there is only one vertical amplifier in these scopes and it positions everything on screen . . . traces and readouts. Depending on the readout mode you are in, the scope may refresh readout between traces, but more likely, it takes occasional "bites" out of the trace and refreshes readout randomly during the sweep. If one of the traces is WAY off screen, the vertical amp has to move very fast to refresh the readout and then back to the extreme position of an off screen trace. The verticals just can't move that fast without some recovery symptoms, which is usually vertical jitter of the readout. So just try making sure all of the traces that are active are fully within the screen area and your readout jitter may disappear . . . Stan w7ni@... |
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Re: WTD: 7704A Power Supply
jcastanton
Lynn,
I have a 7704A in good shape except that it has a weak tube. If you decide to part out your 7704A and it has a good tube, I would be interested. --- In TekScopes@y..., "Lynn Lewis" <mrzuzu@j...> wrote: Okay, guys. Here's the deal. I have the 7704A working but I needsome advice. Slot 1 is unusable and slot 3 is unreliable. All theswitches and controls have been cleaned and work smoothly. All the panel lightswork. Go here to see the scope:or else I can break the scope down into parts and sell the parts. Dickalready wants a power supply. Does anyone else need any boards? Except for theslots, you can see that the scope works. The readouts have a slight ripple sothere's probably a weak filter cap somewhere but it's not bad and itdoesn't show up on the trace. I would be happier with a more focused trace but it'snot as bad asone they will part with ?Service. |
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Re: WTD: 7704A Power Supply
Craig Sawyers
An obvious thing to try first is one of the DeOxit products.Caig also make a product called Pro-Gold that is specifically formulated for gold plated contacts. Craig |
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Re: WTD: 7704A Power Supply
As far as I know (which doesn't go very far), all the 7K scopes used the same
connector system. I've never seen one with a conventional PCB connector for instance. A trait I like about the 7K backplane connectors is they allow easy/smooth plugin insertion and withdrawal. An obvious thing to try first is one of the DeOxit products. This has been mentioned before and I must say I've had great luck with the stuff, usually on the cheap (tin) platings. Maybe this is less helpful with the gold/gold plate that Tek used on the 7K contacts. Don |
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On screen display and other CRT items....
wshawlee2
The "ripple" in the on screen display function of the Tek 7K frames
was a deliberate thing. It was used to prevent phosphor burn by moving the display around slightly, enough to prevent phosphor burn, but hopefully not enough to be visually irritating. This problem becomes very complex in storage scopes, and there are several options to do this in different ways, plus many have the display deleted altogether to avoid the problem. Very late scopes have a different symbol generator card set, and the display does not move, plus the characters look a bit different. I am not sure if they got tired of service complaints about the wiggling display or what, but the "8"'s certainly looked better. The focus of this display function is tricky, as it is a brief time- multiplexed data item in the over-all horizontal sweep process. Its intensity is high to be visible (because the time is short), and this makes the gun dynamics different during this brief interval. This often means a subtle difference in focus or astigmatism occurs. Interestingly, if the data display is far out of focus, it invariably seems to be tied to a weak CRT, and is an early indicator it needs replacing. Tubes in this state also exhibit the odd "decreasing intensity" trait at very high intensity control settings. Many people leave their scopes on (at high intensity) all day. This is very foolish, as it consumes the one thing you can't easily replace in the scope, the CRT. Many HP network analyzer guys did the same thing, and there are now hundreds of them running around trying to get replacement CRTs, which simply don't exist. Their $20K analyzers are now dimly lit doorstops. There is a way to work around this situation, but it's not simple. Good practice is to keep intensity low, and the scope/analyzer off when not in use. A surge protected power bar is an excellent idea, as the switching regulators had no real over-voltage protection until very late in the 22xx series production. A $25 accessory can save your scope from total death. all for now, walter |
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Re: TM500/5000 and 5000 series scopes
deanhuster
Walter, don't forget the military's definition of "portable": it has
handles. Most folks argue about the portability of a 555 or 556. Still, the TM506, fully loaded, was a darned sight lighter and less bulky than the six individual items of equipment that it replaced. I always sat the TM504 or 506 on the bench with the 7K scope on top. When I used the TM515, I had to build a 3/4" plywood "U" shaped box to set over it to support the 7904 since the top of the TM515 wasn't flat. And that's why I modified the TM515 to have a pull-push power switch on the front panel. I didn't want to have to reach around behind all that mess to find the switch. Dean |
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Re: CT501 for a TM500-seried power module
deanhuster
Thanks, guys. I was having a senior moment. "Lemo connector" used
to just roll off my lips when I worked for Tek. A very-finely machined component that's a pleasure to use. And it's the 4-pin version from the DM501 that I used on my Frankensteinian CT501 so that I could get a lot of connector into a small space. The 2-pin version was used for the temperature probe on the DM40/43/44 backpacks for the "new" 400-series portables and the DM502. Dean |
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Re: Info: 564B found FS in Wollongong, Australia
Michael
Er - OK, Wollongong is in Australia, right? So $165 is Aussie dollars?Yes, and yes. That would make it around $80US or around ?60UK. At that price, I'd snapit up. If I wasn't on the other side of the planet, that is :-)Hmmm... sorry about that, chief... Unfortunately, I don't have $165 to spend, or I'd have snapped it up too, but $165 to an Aussie (at least to this one) represents many more working hours than the corresponding $80 or so to a US citizen, I suspect. And given the weight of the thing, shipping would cancel out the bargain value, assuming it arrived undamaged. Oh well, I'll keep my eye on it, and if the price comes down I'll go for it then... Regards, :) Michael |
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Re: WTB: Tektronix 7D01 w/DF1(or DF2)
Ashton Brown
Apropos - I sold one of [the pair] to a person in Spain via eBay, many
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moons ago. Also sent a HP --> UK with no problems. 7D01 arrived OK via US parcel post. I could occasionally be a middleman: some wimps on eBay check the "US only" box. Thus if you just gotta have something from such a seller - perhaps I could tranship for you. My local post office is a few blocks away and tiny = no lines. You'd have to be aware of size/wt. limitations and apprise me of what to put on for customs, given your local conditions. (I have PayPal - not sure if that is Int'l yet, but it could work for paying seller while waiting for your funds..) Doubt this would be practical for say, a 519! or anything so massive as to virtually demand 'foam-in-place' to arrive safely, but I could repack smaller things - according to physics Laws. (This doesn't mean to be an ad - but, I have quite a few Teks too; from 2xx, 3xx 4xx - and 7xxx from pristine to.. 'needs ~ work'. Even Rb and a quartz freq std and a spare 7854!. No, not a resale bizness - though it sometimes comes close.. in swapping for the keepers. As I'll likely Not get to doing minor fixes on several I planned to, anytime soon : well, nuff said) I encountered my first Tek (514AD?) at LBL in '56. Amazing to be able now to acquire the best of the best, as I see the toy digital displays drawing pretty pictures.. sometimes divorced from er reality or, if you want near-Real: at $20K+ $US. {sheeesh} Built my ESR meter from 'Stralia via Canada.. but haven't yet let it attack those stealth-bad electrolytics.. in a couple 485s {sigh} It is a nice hack though and.. it actually does read ESR! (equivalent series resistance - too many TLAs in the world) Just a thought, Ashton (in N. California US) Craig Sawyers wrote: Title says it all ;-). I want just the plug-ins (no probesThese come up fairly often on eBay. Seem to go in the range $10 to $60 for |
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