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Re: FS/For Trash? Type 502 Dual Beam Oscilloscope
mwcpc7@...
In a message dated 11/03/2000 9:56:55 PM Eastern Standard Time,
w7ni@teleport.com writes: It is hard to guess what will happen on eBay. Here is my guess atit just for picking it up.My experience is about the same. I have 5 or 6 502s and would really like to have one operating on each bench that I use for audio work, but they really need thorough servicing and recapping. I burned out two transformers before I learned not to turn them on. I have paid $0.00 to $25.00 for them. I would pick up any similar vintage Tek equipment that are available for the hauling within 50 miles of Rochester, NY or $5 to $15 for one that sits in front of me at a Hamfest. At that rate I get about all I can handle. Mike Csontos
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Re: FS/For Trash? Type 502 Dual Beam Oscilloscope
Stan or Patricia Griffiths <w7ni@...>
Hi Jeramy,
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An old Tek scope like a 502 always has SOME value but whether it is worth the cost the box and ship it is a good question. It is always a good idea to offer these things to the list but it would be helpful to know WHERE it is located to know if one could pick it up without boxing and shipping. As to what it might be worth on eBay . . . good question. I have sold tons of stuff on eBay and I have really been surprised at what some of it went for. I have also put some stuff up for auction that never got a single bid . . . sometimes I have relisted a "no bid" item and gotten good bids on the second try. It is hard to guess what will happen on eBay. Here is my guess at what it is worth: If it looks dead with no trace when you plug it in and turn it on: $10.00. If it has a trace and appears to work: $25.00. A little more if it has a manual and/or probes or a scope cart. I already have two of them plus two 502A models but I would still find a place for it here to save it from the landfill if it was close to here and I could get it just for picking it up. Stan w7ni@teleport.com Jeramy Ashlock wrote:
Hello, I just rescued an old 502 Dual Beam Oscilloscope that
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Re: FS/For Trash? Type 502 Dual Beam Oscilloscope
Michael Dunn <mdunn@...>
At 2:30 PM -0700 2000/11/03, Jeramy Ashlock wrote:
Hello, I just rescued an old 502 Dual Beam Oscilloscope thatNot sure what you could get on eBay, but don't trash it! I'll pay you a reasonable amount for stripped parts if you don't want to keep it together. Shipping intact might be prohibitive. Does it have PCB vertical amps, or little sub-chassis with ceramic strips? ----------------------------------------------------------------- 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@cantares.on.ca Canada | http://www.cantares.on.ca/ -----------------------------------------------------------------
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FS/For Trash? Type 502 Dual Beam Oscilloscope
Jeramy Ashlock <ashlock@...>
Hello, I just rescued an old 502 Dual Beam Oscilloscope that
was about to be thrown out, tubes and all. It is in slightly beat up shape. I am wondering if it would have any value to anyone here, or should I just trash it? What do you think I could I get for this thing on ebay?
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Re: Hello everyone @ tekscopes
Stan or Patricia Griffiths <w7ni@...>
sjhel@aol.com wrote:
Hi stan, thanks for the website info. Stefan has kindly offered to photocopyMost scope problems, it seems, are in the power supplies. I would check the power supplies to make sure they are still regulating when the problem shows up. It would be helpful to know if both A and B sweeps stop at the same time or if it is just one of them. Channel A of the CA plug in does not match the voltage settings of CH B evenOn this problem, I would like to know if it appears that the gain is too low or too high and which channel seems to have the problem? Is the same problem evident in all setting of the volts/div switch or is it just one position? Horizontal display selections other than B and B intensified by A onlySince the trace seems to be there only occasionally, it sounds related to the first problem you mentioned. The dull "cloudy" hue may be due to faceplate clouding on the CRT. Take a close look at the pads cushioning the CRT inside of the shield at the faceplate. Are these BLACK foam rubber or are they sort of orange-brown in color? If it is a strip of black foam-like material, this is bad news and needs to be replaced with different cushion material. There was a chemical reaction between the material that bonds the plastic implosion shield to the front of the CRT and the black cushion material that results in the bonding material in front of the CRT turning cloudy. There is a cure for this and I can share more information with you about it if the cushion materials are black or you thing the CRT faceplate bonding material has become cloudy. I have a tube tester & tested all tubes for quality and leakage & they allOK Stuart, we are started now and the 545B is certainly worth the trouble to fix. Stan w7ni@teleport.com
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Re: 1S1 repair news :-)
Michael Dunn <mdunn@...>
At 5:13 PM +0000 2000/11/02, jlamesch@pop2.restena.lu 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@cantares.on.ca Canada | http://www.cantares.on.ca/ -----------------------------------------------------------------
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Re: Hello everyone @ tekscopes
sjhel@...
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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mdd@dingoblue.net.au
Arnoud van der Wel <A.P.vanderWel@...>
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 <mdd@...>
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 http://members.dingoblue.net.au/~mdd/ I used to have a handle on life, but it broke ...
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Re: Hello everyone @ tekscopes
Stan or Patricia Griffiths <w7ni@...>
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 <http://www.reprise.com> 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@teleport.com Stuart Hellier wrote:
I have been looking for other fans of vintage tektronix stuff for
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Re: 1S1 repair news :-)
jlamesch@...
--- In TekScopes@egroups.com, 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 <A.P.vanderWel@...>
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
mwcpc7@...
In a message dated 11/1/00 5:52:38 PM Eastern Standard Time, sjhel@aol.com
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 <sjhel@...>
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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Re: Free Tek 422 for parts/fixer upper
Daniel Nespoulous <f1bud@...>
Thank you very much but I seek just the crt. The 2215 that I have in is very good state.
Thanks, Daniel Nespoulous F1BUD
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CRT
Daniel Nespoulous <f1bud@...>
Hello, I am a new user of this list.
I am a French amatteur radio and I seek a CRT for the Tektronix 2215 PN 154-0838-00. If you ave an idea send me. Thank you for your responce.
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Free Tek 422 for parts/fixer upper
Chris Beck <europachris@...>
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 http://home.netscape.com/webmail
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Re: Parts needed
Michael <mdd@...>
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 http://members.dingoblue.net.au/~mdd/ I used to have a handle on life, but it broke ...
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Re: Tek Audio test set aa5001/sg5010
STEVE WILKINS <g7mdm@...>
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 http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com.
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Re: Tek 11301/302/A Scopes
Stan or Patricia Griffiths <w7ni@...>
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@teleport.com mhaubmann@haubmann.at wrote:
Dear Listmembers!
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