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Re: Digest Number 1029
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Don Mathis
I have a TEK 485 that is beautiful. It was used at Bell Labs.
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However, I've been told that it needs the HV part 152-0509-00 and possibly a fan. I can't find the HV part. I checked with Sphere in Canada. Rats! Don Mathis Atlanta, Georgia 770-921-9555 --- Original Message ---and use for amateur radio repairs. I see many up for sale on eBay andwould welcome any advice on which I should consider, and which shouldbe avoided due to common problems, or inavailability of parts.I would like to spend up to $200, but would possibly consider goingas high as $350 if there is a compelling reason to do so. Thanks inadvance for your advice and counsel.that they want to sell. Does anyone know of a source for one?sale at a very reasonable price.They contain very few "custom" parts inside. Manuals, probes and parts are easily found just because of the sheer numbers of them built. As scopes go they are relatively easy to work on and trouble shoot if you have to. these can be had for under $200 and the plug-ins go very cheaply as well. They are bigger. much heavier, But the added flexibility of having over 50 different plug-ins to choose from gives you the ability to upgrade for special applications over time. Again Manuals and Parts are pretty available and use and wouldfor amateur radio repairs. I see many up for sale on eBay bewelcome any advice on which I should consider, and which should I wouldavoided due to common problems, or inavailability of parts. as highlike to spend up to $200, but would possibly consider going advanceas $350 if there is a compelling reason to do so. Thanks in Pay attention to any local ham radio swap meets, electronic surplusfor your advice and counsel. stores, or Ebay as a last resort (can you tell I believe in supporting local efforts first?) ;-) 'scope, or if a luggable is more your style. In the case of the benchtop systems, the 7000 series is probably still one of the best buys around. Tek made them for over two decades; Mainframes and plug-ins are still pretty widely available, and they're one of the most versatile 'scope series ever to hit the industry. vertical. or 7B85 timebase, 7A26 vertical (it's good up to 250MHz). may well exceed your stated price point. 7904A mainframes, 7B92A AND 7B85 timebases, 7A24 vertical (50 ohm inputs, suggest using a FET probe), 7A26 (you can still use them in the higher-bandwidth mainframes) for high-impedance (1M-ohm) input. The 7A24 goes up to 400MHz, and you can also try for a 7A29. 7A29 vertical for high-frequency signals, 7A24 or 7A26 for lower-end stuff. the CRTs are very susceptible to damage (burn-in and other nastiness). Unless you have an explicit need for an analog storage 'scope, it is probably best to avoid them. CRT fragility problems. This would include units like the 468, many of the 11000 series, the DSA600 series, and pretty much everything that comes after it. and 485 series. The 475A will go up to 250MHz. I should also mention that the 460 and 470 series were widely used as field-service 'scopes by many a computer tech in the late 70's through the early-to-mid 80's. Your price point should work for pretty much anything in this series with the possible exception of a 485, or a mint-condition specimen of the other series. and use wouldfor amateur radio repairs. I see many up for sale on eBay and bewelcome any advice on which I should consider, and which should I wouldavoided due to common problems, or inavailability of parts. as highlike to spend up to $200, but would possibly consider going advanceas $350 if there is a compelling reason to do so. Thanks in equipped withfor your advice and counsel. surreal ports?"of Service. of Tek scopes & have quite a good selection of test equipment totest functionality & calibrate them. Anytime I put a scope I'vefixed & calibrated up on eBay, I stand behind it 100%. Some scopesI've sold have had some problems that wasn't worth me monkeying aroundwith it, but I note the problems clearly and sell those scopes as-isor as parts units. I, like Gary, am in it for the hobby aspect offixing up a non-working scope that someone can use. I cannot justifyit as a money making effort given the time I put into it. So I consider the persons buying my scopes for a reasonable price as fortunatethat someone has taken the effort to fix, clean & calibrate them.because most of my test equipment is out of calibration. But I havecertain key test equipment in cal, a very accurate Fluke DMM, leveledsine generator to 900 Mhz, etc., that I check my other equipmentto. And as far as horizontal timing, there are plenty of tricks I useto check my frequency source, like using WVVB, and zero-beatinglocal AM stations for the higher frequency checks. While arguably notsuper precise, it is good enough for scopes that are only accuratein the 1 to 3% range anyway.am planning onand atmarketing will be fully tested and supplied with a manual least 1Tektronix probe. I have invested heavily in calibration equipment, pulse &function generators, etc. to insure functionality and proper operation (andbecause I like having lots of equipment). I have made whatever repairsI don'tnecessary. I do this more as hobby than a profit center so countThethe many hours some instruments require as part of the price. photos Iprovide are not the grainy, out of focus, non-operating bogus photos thatmany post (and who knows what instrument they were photographing). Mine areguaranteed to be of the actual intrument with actual waveforms displayed onthe instrument. This is a win win situation, I enjoy the troubleshootingwilland refurbishing and want to pass an instrument along that bring asrepairsmuch joy and satisfaction as I have had getting it there. I don't countnecessary. I do this more as hobby than a profit center so photos thatthe many hours some instruments require as part of the price. troubleshootingmany post (and who knows what instrument they were will bring asand refurbishing and want to pass an instrument along that thatmuch joy and satisfaction as I have had getting it there.Hear hear! Me too. I'm congenitally incapable of selling something either I know doesn't work, or that I haven't tested. If I'mselling a sampling system, I show photos of the actual unit showing theresponse to a 30ps rise pulse. If a storage scope, I show a stored trace.Gives you a real buzz to get under the original designer's skin - thethings they did well, and the short cuts taken too. Like the 7B15 I've justchecked over (for my own use) with an electrolytic with the end bulging -because the assembly tech put it in the wrong way round when it was originallybuilt. I've got three 7T11's with quirky habits and three 7S11 withoddities - and I won't put these on eBay until they are fixed.have - rebuilt it stem to stern. Quite daunting when you end up with a V12engine in an awful lot of parts - and boy is that a set of compromises -a superb engine using a GM400 gearbox, with horrendous cost cutting everywhereelse. Death by Lucas, the prince of darkness. Enjoy driving it now in thefine weather - the UK is a total salt belt in the winter.dissapointed when they come in in too good a shape. Like you I also showstorage trace photos also if it's a storage scope.I also restore vintage tube equipment (or valve if you like) My latest beinga 1938 Wurlitzer organ in a church. The way I look at it if you canrepair complex test equipment you can fix anything!for quantitative measurement with all of the good surplus countersand DMM's out there. I use my scopes mainly for displaying electrical/electronicrepairs > necessary. I do this more as hobby than a profit centerso I don't countbogus photos thatwill bring as > much joy and satisfaction as I have had getting it there.something that either I know doesn't work, or that I haven't tested. IfI'm selling a sampling system, I show photos of the actual unit showingthe response to aGives youthings they didchecked over (for my own use) with an electrolytic with the end bulging- because the assembly tech put it in the wrong way round when it was originallybuilt. I've got three 7T11's with quirky habits and three 7S11 withoddities - andI have - rebuiltengine in an awful lot of parts - and boy is that a set of compromises- a superb engineelse. Deaththe fine weather - the UK is a total salt belt in the winter.of Service. to do the risetime on the 067-0587-XX Standardizers for the 7000 Series.Any help will be greatly appreciated. I cannot even find it when I googleit. try to describe it for you:I will call that connector J1. For pinout of J1 I will use convention wherepin #1 is top right pin when facing connector (opposite from wire side)and pin #2 is left of the pin #1, i.e. odd numbered pins are in upper rowand even pins are in lower row of pins.(J2) which mates with P6451 probe pod input signal end and the second connector(J3) is a 2 pin 'comb' which mates with ground connection on probe pod.(a pull ridge with words 'PULL HERE' facing down), pin on the left side willbe called pin #1. Similar numbering convention is used for J3.unreadable. get a two row header with wire-wrap pins and hack it to size to make a 12pin connector. Then, you can use your regular 'comb connector' from logic analyzerand plug wire end to wire-wrap pins. For ground connection you can useregular logic analyzer ground connect and hook it up to pins 2 and 11 of J1.In that way you have adapter you wanted without destroying analyzer's combconnector. readable, so I will send you that thing as an attachement in direct mail.sorry. I logicneed the wiring for Diagnostic Lead Set 012-0556-00 for Tek and I haveanalyzer 1240. Its just 10 wire cable with two connectors last year.searched for hours with no prospect at all. Missed both of them.which I intend to make up myself. Basically, it is a plug and a socketwith a section of circuit board in between about 5/8" long. The socketis the same as in a 7xxx series backplane. And the plug has the same plasticframe as a plug in. So given a scrapper scope and plug-in that can beharvested for the bits, the rest is straightforward - a piece of easily madePCB is all that is needed. I saved the images from one of the auctionsfor reference - let me know if you'd like a copy.(vert -), A13 (trig +) and B13 (trig-) are broken out at the socket with peltola-endedplug for the four signal lines, but the earths on A12, B12 connect through.high frequency 50-ohm terminations on the back. A disc of circuitboard with 4x200 ohm surface mount resistors mounted radially is good toabove 1GHz - or just solder them across (have a look atfor the general concept). The idea is that you can terminate thetrigger cables while looking at the vertical signals and vice versa.it would be just as good to use BNC in any of these positions, and easyto buy GR-BNC adaptors to get to (say) S1 or S2 samplers.to do the Any helprisetime on the 067-0587-XX Standardizers for the 7000 Series. google it.will be greatly appreciated. I cannot even find it when I are handy. I must have come across of that -0655 gig because a had it downas an item to buy, but I thought that was just plain rigid extender (whichis actually 067-0589-00).that brass eyelet termination, per chance, which Tektronix used widelyfor internal cable connectors?last year. one which IMissed both of them. with aintend to make up myself. Basically, it is a plug and a socket socket is thesection of circuit board in between about 5/8" long. The sameplastic frame asas in a 7xxx series backplane. And the plug has the same aharvested forplug in. So given a scrapper scope and plug-in that can be made PCB is allthe bits, the rest is straightforward - a piece of easily forthat is needed. I saved the images from one of the auctions reference -(vert -), A13let me know if you'd like a copy. peltola-ended(trig +) and B13 (trig-) are broken out at the socket with plug for thecables grounded to A12, B12. There is no connection to the with highfour signal lines, but the earths on A12, B12 connect through. board withfrequency 50-ohm terminations on the back. A disc of circuit to above 1GHz -4x200 ohm surface mount resistors mounted radially is good triggeror just solder them across (have a look atforthe general concept). The idea is that you can terminate the cablesit would bewhile looking at the vertical signals and vice versa. to buy GR-BNCjust as good to use BNC in any of these positions, and easy used to do theadaptors to get to (say) S1 or S2 samplers. Any helprisetime on the 067-0587-XX Standardizers for the 7000 Series. I google it.will be greatly appreciated. I cannot even find it when these which Ernest Lans (from Holland) won on eBay on 4/15/03.you with Ernest's email address (assuming that is OK with him) if youneed to reach him.to do the risetime on the 067-0587-XX Standardizers for the 7000 Series.Any help will be greatly appreciated. I cannot even find it when I googleit. the FG501A at BAMA, but it is quite a bit different than the FG501. Thanks, Brucefound the FG501A at BAMA, but it is quite a bit different than the FG501. Thanks, Bruce |
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