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Re: Do they all do this?
--- In TekScopes@y..., dhuster@p... wrote:
No, given it goes away when I switch end of scan updates for the OSD1. I was getting "dot crawl" on the traceI'm not sure what you mean by "dot crawl". Are you referring to on I imagine it's just the gun moving to update the OSD and, thus, causing a brief break in the waveform trace. No - I know have a service manual and will stripdown the HT section.2. Sometimes the mainframe cuts out with a crack - only to returnTHAT doesn't sound good! I'm guessing it's a dry joint on the line transformer. you3. Using the storage facility in variable persistence worksadjusted may be used to with the 564B, T912, 314, 214 and 434 or the 4000-I've never found a reason to use the bistable mode vs. the variableAhhh - thanks. Does sound more like a feature. It's almost perfect in variable persistance mode - I just expected the same in bistable. The service manual doesn't really outline the differences between the two modes and how they physically function. Overall it's a great piece of kit - I originally bought it with the 7L12 purely for spectrum analysis use - but the range of plugins (at reasonable prices) just make it such a flexible piece of gear. Thanks for your help, Steve. |
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Re: Do they all do this?
1. I was getting "dot crawl" on the traceI'm not sure what you mean by "dot crawl". Are you referring to the mesh ghosting? 2. Sometimes the mainframe cuts out with a crack - only to returnTHAT doesn't sound good! 3. Using the storage facility in variable persistence worksadjusted both the controls detailed in the service manual to no effect. Steve, the bistable mode on the variable-persistance scopes (7623, 7633, 7834, 464 and 466) aren't at all like the bi-stable storage you may be used to with the 564B, T912, 314, 214 and 434 or the 4000- series graphics terminals and 4051/52 desktop computers. You will have a bright background and lousy -- REALLY lousy -- contrast. I've never found a reason to use the bistable mode vs. the variable persistance or high-speed modes on those scopes. Dean |
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Re: Power supply Tektronix 465
Miroslav Pokorni
My limited experience with 465 was a dried electrolytic, still some
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capacitance, around 20% of nominal. I also heard from other people about broken caps (open circuit) or drastically reduced value. The size of cap can be a challenge when fitting in 465, when I did it I had to buy part from Tektronix. Regards Miroslav Pokorni -----Original Message-----
From: E.u.R.Labrenz@... [mailto:E.u.R.Labrenz@...] Sent: Saturday, August 25, 2001 11:31 AM To: TekScopes@... Subject: [TekScopes] Power supply Tektronix 465 Hi, I am the owner of used Tektronix 465 with instruction manual since two weeks. First I started the calibration procedure. I?ve found in the power supply which is normally 110 VDC a voltage of 145 VDC and the ripple voltage is 2 VAC ( normally 20 mVAC). In my instruction manual I am still missing the schematic number <12> of the power supply. Can anybody tell me a solution for this problem. and if it is possible to send me a scanning of the schematic <12>. Best regards Rainer Labrenz e.u.r.labrenz@... ------------------------ Yahoo! Groups Sponsor To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to [Non-text portions of this message have been removed] |
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Re: My trip to France
Mark Gurries
Stan or Patricia Griffiths wrote:
If you go the <> there is a page for "StanThank You. I will send you a check in the mail. If I can, I would like to take you up on the signature too. I would appreciate it. Best Regards, Mark Gurries Power Supply Applications Engineer/Manager --------------------------------------------------------- Model Railroad Club and NMRA DCC presentations are at: -------------------------------------------------------- Audio Enthusiast (Love SAE equipment) ---------------------------------------------------------- |
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Re: option 78 r7903
Miroslav Pokorni
I checked catalog from 1988. Option 78 is what Stan said, P11 phosphor only;
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a good photographic phosphor, but a god awful blue color that hurts eyes. The other things that you are talking about, higher acceleration voltage, resulting in reduced active screen, so the graticules are made smaller to fit deflection, together with P11 phosphor makes Option 13. If mechanical differences that you are talking about is a camera adapter permanently bolted to the scope, that is a private modification done by (or for) EGG; I have one of that kind. If that is the case, I would advice to resist urge to remove bolts, that did cost me several hours of work without anything to show for it. These bolts are deeply imbedded into the frame, I believe that I had to move CRT to get one of bolts out. I do not find that scope really useful, I hate the color of the trace, whole screen is too small, there are only 3 slots. My lame excuse for buying the package was that for $200 I got 2 pcs of 7A19 (at the time when they were selling for $100 a piece), an indifferent time base (I think it was 7B80 and I had few already) and mainframe was there, I thought I will get some parts to fix other power supply. It turned out that 7A19 had a strange option that I did not find described anywhere: trace position was recessed the way GAIN control is and there was no IDENTIFY button. I bet, Tektronix does not have that option listed. In the haste to get my paws on a 7A19 I did not notice that there was no POSITION control. Mind you, these were among first 7A19 that I saw in flesh. There were lot of scopes like that on the market, good number of them with EGG property tags. It looks to me, these were some of maybe thousands of scopes seating on the 19" racks, used at Nevada test site. Time base had marked setting, intensity had a marker, too, and so did attenuators for both 7A19, the whole scope setting was pre-canned. Regards Miroslav Pokorni -----Original Message-----
From: mongteen@... [mailto:mongteen@...] Sent: Wednesday, August 22, 2001 10:14 AM To: TekScopes@... Subject: [TekScopes] option 78 r7903 Hello, What is option 78 for the r7903? I checked the reference section on reprise and the jug 154-0644-09 goes into a r7903 with opt 78 and nothing else. Is it a special jug? For example higher PDA voltages and smaller divisions? Mechanical differences? Thanks Windsor ------------------------ Yahoo! Groups Sponsor To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to |
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Do they all do this?
Hello All,
I'm not sure if my scope is construed as a classic and, therefore, if I've posted this to the wrong group I apologize. Anyway, I recently purchase a 7623A mainframe along with 7L12, 7A26 and 7B53A plugins. These all work fine and I'm jolly impressed with the scope given that standard of kit I've used in the past. I do have 3 questions, though:- 1. I was getting "dot crawl" on the trace, which was especially apparent on the 2m/s horizontal setting (even with no vertical plugins fitted). Switching OSD update function from interrupt drive to end-of-trace removed this problem. I presume this is a "feature" and, hence, the reason for the switch? 2. Sometimes the mainframe cuts out with a crack - only to return again. I only noticed this happening since fitting the 7A26+7B53 plugins (left socket isn't used with just 7L12). I'm guessing it's a problem in the HT circuit? Is there a favourite candidate for this problem? 3. Using the storage facility in variable persistence works fine using both normal/fast modes. However, when using bistable storage the background is very bright and ,hence, there is very little contrast between the background and the sample. I've adjusted both the controls detailed in the service manual to no effect. Thanks for any answers you may have, Steve. |
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Re: My trip to France
Stan or Patricia Griffiths
Sure Don, I am always happy to autograph the book when asked to do it.
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Stan Don Black wrote: Sorry Stan, I didn't know you sold the book direct. Perhaps you would autograph it |
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Re: My trip to France
Stan or Patricia Griffiths
If you go the <> there is a page for "Stan Griffiths". I
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think that is where you will find the book info. In any case, I sell it directly via mail, for $24.95 and I pay the postage. Stan w7ni@... Mark Gurries wrote: Don Black wrote:Hello Jose,Where can you buy the book? I did not see any information about where on |
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7854 High Voltage Multiplier needed
Doug Hale
Does any have a 152-0716-00 or know where I can get one. This is
a times 7 high voltage multiplier. It converts the 3KV high voltage from the HV transformer to the 21KV CRT Anode supply. This is a black epoxy potted module approx. 1" 2" X 3" The Markings on it are: VMI VM 164 152-0716-00 8703 I assume 152-0716-00 is the Tek part number 8703 is a date code Thanks Doug Hale |
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Power supply Tektronix 465
Hi,
I am the owner of used Tektronix 465 with instruction manual since two weeks. First I started the calibration procedure. I???ve found in the power supply which is normally 110 VDC a voltage of 145 VDC and the ripple voltage is 2 VAC ( normally 20 mVAC). In my instruction manual I am still missing the schematic number <12> of the power supply. Can anybody tell me a solution for this problem. and if it is possible to send me a scanning of the schematic <12>. Best regards Rainer Labrenz e.u.r.labrenz@... |
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Re: My trip to France
Don Black
Sorry Stan, I didn't know you sold the book direct. Perhaps you would autograph it
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for Mark too if he asks nicely. Don Black. "Phil (VA3UX)" wrote: Just eMail Stan directly. He also puts them eBay in the Test Equipment |
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Re: My trip to France
Phil (VA3UX)
Just eMail Stan directly. He also puts them eBay in the Test Equipment section.
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Phil At 12:29 AM 8/26/2001 +1000, you wrote:
Hi Mark, |
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Re: My trip to France
Don Black
Hi Mark,
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You should find it a a good technical bookshop. AES <www.tubeandmore.com> and Amazon.com <www.amazon.com> both stock it. Don Black. Mark Gurries wrote: Don Black wrote:Hello Jose,Where can you buy the book? I did not see any information about where on |
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Re: option 78 r7903
Stan or Patricia Griffiths
Hi Windsor,
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Option 78 for the R7903 is a P11 CRT phosphor. I think that's all there is to it. Stan w7ni@... mongteen@... wrote: Hello, |
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Re: My trip to France
Mark Gurries
Don Black wrote:
Hello Jose,Where can you buy the book? I did not see any information about where on the website. Best Regards, Mark Gurries Power Supply Applications Engineer/Manager --------------------------------------------------------- Model Railroad Club and NMRA DCC presentations are at: -------------------------------------------------------- Audio Enthusiast (Love SAE equipment) ---------------------------------------------------------- |
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Re: Tektronix 545B (VI)
Stan or Patricia Griffiths
Hello Jose,
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I am glad you found the bad cap. I am sure I have an exact replacement for the 125uf cap you need. How can I send it to you? Stan w7ni@... JOSE V. GAVILA (EB5AGV/EC5AAU) wrote: Hello again, |
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Tek 2336YA
August 23, 2001
I have just bought a 2336YA on eBay w/o manual etc. Can someone suggest a quick way to get the basic operating instructions? Alternatively (and anticipating need to calibrate etc in the future) is parting with $70 plus for aservice manual the best choice? What are the recommended probes for this model? Suggestions from more experienced hands would be greatly appreciated. I last worked with Tek's 40 years ago: they seem to have changed a bit in the interim. Thanks Richard Jones Toronto, Canada |
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Tektronix 545B (VI)
JOSE V. GAVILA (EB5AGV/EC5AAU)
Hello again,
First, forgive me for my dumbness; I forgot to upload the last picture!. I have done it, along some other pictures... as the oscilloscope is now WORKING!!!. Not at 100%, but lots better than before. You can look at these pictures for the current images: General view: Close view with a " 'B' INTENSIFIED BY 'A' " trace of the calibrator signal. Despite the picture, traces are actually very sharp: This is the one I missed last time: So, as you can see, the 545B is finally going back to life!. And which was the fault, you will ask?. An electrolityc can, of course!. But (thanks Stan!) not the one I had looked but another a bit more hidden (not too much; I just missed it). It is a 125uF can. As I had none similar, I have temporarily put a 47+22uF 450V capacitor pair so it is a bit under specs but, until I get a convenient one, it does its work. Ripple is now close to the 5mV nominal value. I have also put a fuse holder and an slow blow 3A fuse (we have 220V/50Hz power here in Spain, so the fuse rating). So far I have just added this and a new power switch (which was faulty, about 6 Ohm closed; it got really hot) along the couple caps. Basically, the oscilloscope seems to have few tubes changed, a couple diodes and some resistors. Not bad for a 30+ years old scope!. BTW, I think this one dates from 1968, same year I was born. So it is still young :-)! Now I have located a fault in the TIME BASE B. If I put TRIGGER in AUTO or DC, it does not work. It does in AC position, so I will look at this in the manual. Of course, hints welcomed! Also, the 1A1, whilst worksm has the usual microphonic nuvistors... but at least they work. Both channels are fine and, after some contact cleaner, all controls do they intended function. Well, for my first tubed Tektronix work, I am really happy with the results so far. Now I hope to get some plug-ins... any available? Thank you all for your help! JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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