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Re: 1S1 repair news :-)
Michael Dunn
At 5:13 PM +0000 2000/11/02, jlamesch@... wrote:
Hi,Giving you part numbers would not be too useful, since the 1S1 still has the offset problems I mentioned. I got a couple of different types through Digikey. If you want to experiment, I expect it's best to look for low-capacitance parts, say, 1-2pF. I'll get back to the 1S1 when I have time. It *is* a weird circuit, and difficult to troubleshoot, even with the manual! BTW, the Sept 18th Electronic Design has a design idea circuit that's very similar to the Tek design, but modernized and simplified. Quite a coincidence! ----------------------------------------------------------------- Michael Dunn | Surround Sound Decoder & Stereo Enhancement Cantares | Self-Amplified Speakers, Test Equipment 74 George St. | Ambisonic Surround Sound CDs and Recording Waterloo, Ont. | (519) 744-9395 (fax: 744-7129) N2J 1K7 | mdunn@... Canada | ----------------------------------------------------------------- |
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Re: Hello everyone @ tekscopes
Hi stan, thanks for the website info. Stefan has kindly offered to photocopy
his 545b manual so that's one hurdle crossed. The problems i'm having with my 545b are: The trace stops and becomes a stationary dot once the scope has been on for around 10-15 minutes. Channel A of the CA plug in does not match the voltage settings of CH B even when adjusting the gain pot. Horizontal display selections other than B and B intensified by A only display a dull "cloudy" hue, occasionally showing a trace as you turn the time / cm control. I have a tube tester & tested all tubes for quality and leakage & they all checked out okay so I guess these problems are to do with other parts of the circuitry. Bye for now Stuart |
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Arnoud van der Wel
Hi Michael,
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Sorry: the request for you address should have gone to you directly, not to the list. I don't need payment; happy to be able to help you out. Regards, Arnoud. -----Original Message----- |
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Re: Parts needed
Michael
Hi Arnoud, :)
Sometime on Thu, 02 Nov 2000, you wrote: -Hi Michael,Sure can. :) Michael Dunn PO Box 103 Woodford NSW 2778 Australia How would you like me to pay you for it...? Thanks and regards, :) Michael -- Michael VK2XMD 0404-478-205 I used to have a handle on life, but it broke ... |
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Re: Hello everyone @ tekscopes
Stan or Patricia Griffiths
Hello Stuart,
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Welcome to this group of Tek scope fans! The type 570 Tube Curver Tracer is probably the most desired of early Tek scopes. This also makes is rare and expensive. Tek only made about a thousand of them and most of the remaining ones are in the hands of "glass audio" enthusiests who value them very highly. Pristine ones are worth about $3000 USD in the Far East, as I understand it. You would be very lucky to find one at any price . . . I have one in my collection, but I was lucky to find it in an estate sale in a barn about 30 miles from my home near the orignal Tek plant. Mine is a proto-type and was built before regular production on them started. I got it for $40 USD, as I recall it. You might find the web page dedicated to early Tek scopes at <> to be of interest to you. There is a list of people who can supply manuals or copies of manuals there for Tek instruments. I sell some manuals myself on eBay so you might want to check that out too. I have a rather huge collection of old Tek stuff (665 instruments) and I might be able to help you solve some of your 545B/CA problems if you describe them to me. You will need manuals for each of those instruments and it would help if you had them first so we can have a common ground for discussing the circuitry. Stan w7ni@... Stuart Hellier wrote: I have been looking for other fans of vintage tektronix stuff for |
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Re: 1S1 repair news :-)
--- In TekScopes@..., Michael Dunn <mdunn@c...> wrote:
As for the six missing GaAs diodes in the sampling bridge andunit is now working somewhat - there are some triggering and offsetvalid trace!!! Whether these probs are a result of the Schottkys, Idon't yet know. All I can say is, it's VERY cool to scroll over a 200MHzuseless, as the risetime of the thing is *only* about 300ps...Hi, replacing the GaAs diodes with Schottkys sounds extremly interesting. Could you write which type of Schottky diodes you used? I think a lot of (potential) sampling plugin repairers would appreciate this information, at least I would. Thanks a lot, Laurent Lamesch |
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Re: Parts needed
Arnoud van der Wel
Hi Michael,
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I have the pot here for you. Can you give me a postal address? Regards, Arnoud. -----Original Message----- |
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Re: Hello everyone @ tekscopes
In a message dated 11/1/00 5:52:38 PM Eastern Standard Time, sjhel@...
writes: I checked out the SND tube sales site the other day & discovered thatThe 570 is a very rare item even here in the US. A friend of mine had one and sold it to a collector for a quite high price. You can see that very unit on the cover of Alan Douglas's "Tube Testers and Classic Electronic Test Gear". According to the book, only about 1000 were made over a period of ten years, starting in 1956. Mike Csontos |
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Hello everyone @ tekscopes
Stuart Hellier
I have been looking for other fans of vintage tektronix stuff for
ages! I have an old 545b unit with ca dual trace plug in module, but I have a few problems with it & have not been able to find a service manual. I am a sound engineer from the U.K & no one seems to know much about old tek gear (including tektronix U.K)! So if any of you guys could lead me to any technical data or service manuals, it would be most helpful. I checked out the SND tube sales site the other day & discovered that Tektronix used to make a valve curve tracer (the 570). I do quite a lot of work on old valve equipment, (usually fixing guitar amps for friends) & it would be great to test the valves I have to see how well they match. Many amps that come in have an assortment of valves where one has been replaced when it has finally expired instead of a new matched set being fitted. Thanks to stefan for the T & M museum, theres some useful & interesting stuff in there, & I enjoyed looking through the exhibits. Bye for now, I shall log on again soon! |
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Free Tek 422 for parts/fixer upper
Chris Beck
I have a clean Tek 422 but it does not work. I was told it was the power
supply and that there may be a flyback problem. I haven't verified either problem, and just don't have the time or the desire to track it down. I looked around in the power supply and didn't see any obvious signs of distress, so who knows. The fellow who gave it to me is a chief engineer at a TV station, so I would assume he knew what he was looking at. I've got my big 535A anchor and a small Hitachi 40mHz scope for when I need portablilty, so I'd rather see it go to a good home (USA, preferably) as a parts donor or fixer-upper project. The scope is REALLY clean, but the foam lining of the accessory area in the front cover turned to goo long ago. It would need a bit of elbow grease to clean it up and replace it. I think there may even be a probe and power cord in there, I'll have to check. So, it is free for the asking, all I ask is the "buyer" pay the shipping. I'll box it up real well so it won't get wrecked. Thanks, Chris Beck West Bend, Wis. ____________________________________________________________________ Get your own FREE, personal Netscape WebMail account today at |
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Re: Parts needed
Michael
Hiya. :)
Sometime on Tue, 17 Oct 2000, you wrote: -Do you know the Tek part number?Yep. Part number is: 311-1404-00 Hope you can help... Thanks and regards, :) Michael -- Michael VK2XMD 0404-478-205 I used to have a handle on life, but it broke ... |
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Re: Tek Audio test set aa5001/sg5010
STEVE WILKINS
Dear All,
is there any one out there who fixes the above in the Toronto area ? The unit is used professionally and is in need of some TLC on the analyser regards Steve _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at . Share information about yourself, create your own public profile at . |
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Re: Tek 11301/302/A Scopes
Stan or Patricia Griffiths
If you bought that 7K extender on eBay, I think you should file a complaint
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against the seller for misrepresenting the item he was selling. Ebay does not like that very much and will kick him off it it happens a couple more times. I don't like it either and I take great pains to try to describe everything I sell including details of anything minor that is missing or not quite right . . . I also try to photograph the WORST side . . . or both sides. Stan w7ni@... mhaubmann@... wrote: Dear Listmembers! |
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Tek 11301/302/A Scopes
Dear Listmembers!
I am interested if anyone knows if the vertical plugins like 7A19,7A24,... work also in the 11302(A) Scopes (The calibration plugin does so) and what disadvantages this would have except that they are not programmable. I am also searching the female 7k scopes plugin connector. (I purchased a 7k rugged plugin extender which is missing the white cover plastic strip and four contacts, but the photograph was taken from the other side so the ..... was not visible to me) Thank You very much Michael B. Haubmann mhaubmann@... |
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Re: Parts needed
Michael
Hiya. :)
Sometime on Tue, 17 Oct 2000, you wrote: -Do you know the Tek part number?I'm expecting a copy of the manual shortly, I'll let you know and you can ask if he has one if you don't mind. Thanks and regards, :) Michael -- Michael VK2XMD 0404-478-205 I used to have a handle on life, but it broke ... |
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Re: What's this Tek item?
Stan or Patricia Griffiths
Wow, I need to pay more attention to eBay! You got a REAL STEAL on this
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stuff, and yes, I know what it is. The Tek S-3260 is a very large computer controlled system for testing integrated circuits. It is vintage about 1975 or so. Some of the options for the S3260 included a 568 scope with 3S6 and 3T6 sampling plugins for making some very fast risetime measurements on the IC under test. The S3260 was capable of handling large scale ICs with up to 64 pins in its largest configuration (they may have even made larger ones than that). Any way, the 568/3T6/3S6 is only a two channel sampling system so how do you look at 64 IC pins with only two channels? The answer is that you multiplex the two channels to all 64 pins. How do you do that without losing all the fast capability of the sampling system? The answer is that you locate the sampling heads (S1's in this case) as physically close to the IC pins as you can and dedicate one S1 to each IC pin and multiplex the S1's to the two 3S6 channels. The multiplexing is done in groups of up to four sampling heads plugged into a 286 Sampling Head Multiplexer. If your system needs more than four sampling heads multiplexed, you can multiplex up to four 286's with one 288, for a total of up to 16 sampling heads. Still not enough sampling heads? OK, you can slave up to three 287's to one 288, each one loaded with four 286's, with each of those 286's loaded with up to four sampling heads, for a grand total of 64 sampling heads multiplexed. All of this is explained with pictures on page 251 of your 1973 Tektronix Catalog . . . The multiplexers (286's, 287's, and 288's) are not particularily valuable today (except as maybe an addition to my collection!) since they are only one component of a large S3260 system and you don't have the rest of it, like the DEC PDP-11 computer, the Tek 1340 Interface Units, and the necessary software to control it all. The S1's however, are the gold at the end of this rainbow! The 1989 Tek Catalog lists S1 Sampling Heads available from Tek new at a cost of $1695 each! (And you got 23 of them for $2.25 . . . ! ! not to mention the 286's, etc.) Anyway, those same sampling heads are useful in the 3S2, 7S11, 7S12 and a few other sampling plugins. So, if those sampling heads actually work, you should be able to get at least 1000 times your money back . . . but you would really need to check them out first to expect that kind of return. You say you don't know how to check them out? OK, so I will give you ten times your money right now and I'll check them out . . . how about that! 8-) I took a look at the picture of the stuff you bought and I actually counted 55 sampling heads in the picture. You could always complain to the seller that you thought you were getting everything shown in the picture and you expect to recieve all 55 sampling heads . . . ! ! (Then you should be able to get 2000 times your money ! ! ) Surely this detailed explanation is worth one sampling head and not just a crumby old useless S3260 compensator card, right? Stan w7ni@... tomg@... wrote: Hi, all. I just purchased a "Tektronix Multiplexer Control Unit", |
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What's this Tek item?
Hi, all. I just purchased a "Tektronix Multiplexer Control Unit",
for the huge sum of $2.25. (I guess no one else was paying attention, at the time! (Ebay, last night!)) It includes 23 individual S-1 Sampling Heads plugins, which I think I am somewhat familiar with. But, it also includes 32 individual "S-3260/Mod 20 Compensator" plugins. I have NO IDEA what these are, and can't seem to find ANY information with web searches. I am hoping to help finance my Tek scope lust, with this windfall. I know the sampling heads are worth a little something. But I haven't a clue as to the usefulness of the compensators... Does anyone know what these are good for? (First good answer gets a free Compensator plugin, post-paid...!) Thanks!! Tom Gootee tomg@... |
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Re: Parts needed
Michael,
Do you know the Tek part number? I know a guy who just bought an assortment of Tek pots. Tom Gootee tomg@... --- In TekScopes@..., Michael <mdd@d...> wrote: intensity/readout controls were damaged. It needs a new ganged pot and concentricknobs.
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