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Re: 3.5" floppy disk drives for shipping
On Tuesday 07 December 2021 11:34:25 am Dave Daniel wrote:
All,I hadn't thought about there being some need for these for repairing vintage instruments. ?I have a couple of boxes of them, ?and am looking to get rid of them as well. ?Same terms as what he's saying here. ?I haven't taken the time to go through them and make a list of drive models, ?etc. but can do that if needed. ?Better to get them into the hands of someone who can use them than to simply scrap them... roy@... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin |
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Re: 7S14/5S14N bias supplies: something to build on
#photo-notice
Hi Paul,
You got my idea right; years ago (I believe more than 10) I bought two non working 7S14 for a total of $30, one came totally dismantled (as far as I can say, though, nothing is missing). Non working condition was, of course, due to battery cells. In fact what I found inside were regular 1.5V button battery cells (and probably replaced not only once), no sign of initial mercury cells. The one that I restored works fine today (you have to do the normal calibration, or, at least, check and adjust balance). Your idea with side emitting LEDs is good, but might need more attention with alignment. Good luck with whatever solution you chose to apply; let us know your results TT |
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Re: What is a 5B10 with Mod 711C?
Hi Jeff,
I just semi-randomly found this: which includes slightly more information: Mod 710R: X-Y operation, right Vertical compartment switchable from Vertical to Horizontal operation. For use with standard amplifier plug-ins. Requires 5B10N Mod 711C. Mod 711C: X-Y operation plus control of unblanking. One switch position allows operation of time base as unblanking generator. See 5100 Series, Mod 710R. (manually transcribed by sleepy proofreader) That same 1991 catalog page 78 mentions an app note that may or may not be relevant: "Simultaneous display of two independent X-Y signal pairs" / "5111/5A14N/5A15N/5A18N. Dual X-Y techniques, engine analysis." / order no. 52-AX-4114 More wordy words over here: /g/TekScopes/topic/87584525 |
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Re: Simultaneous indep. X-Y pairs? + XY/YT hijinks on 51xx scopes
...and then I randomly stumble into this image-only scan while looking up unrelated mods...
which includes: Mod 710R: X-Y operation, right Vertical compartment switchable from Vertical to Horizontal operation. For use with standard amplifier plug-ins. Requires 5B10N Mod 711C. Mod 711C: X-Y operation plus control of unblanking. One switch position allows operation of time base as unblanking generator. See 5100 Series, Mod 710R. (manually transcribed by sleepy proofreader) So, yeah, smells like "dual X-Y techniques" and these mods go together. Still curious to find the dual X-Y app note. |
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Simultaneous indep. X-Y pairs? + XY/YT hijinks on 51xx scopes
A couple of days ago Jeff Dutky asked "What is a 5B10 with Mod 711C?"
/g/TekScopes/topic/87553689 and Petru Ulici found the answer on p.78 of the 1991 Tek catalog: it's a 5B10 modified to work with mod 710R "XY/YT switching of center compartment signal", which is... I didn't find anything more about mod 710R. That same catalog page also mentions some app notes including: "Simultaneous display of two independent X-Y signal pairs" / "5111/5A14N/5A15N/5A18N. Dual X-Y techniques, engine analysis." / order no. 52-AX-4114 and "Simultaneous X-Y, Y-T displays" / "511 1/5A14N/5A15N/5B12N. X-Y. Y-T techniques. Biomedical application." / order no. 52-AX-4113 I found an article matching the X-Y/Y-T title and description in a 1979 issue of _Tekscope_ magazine. That looks like it might have become the 4113 app note. That article describes a method that requires no modification (that I noticed), so it doesn't explain mod 710R. "Simultaneous display of two independent X-Y signal pairs" sounds interesting. I assume "independent" means four independent signals rather than one X + two Y signals. But I haven't found any more about that. I haven't thought of a way to do it with a 51xx scope -- which doesn't mean much. It looks like a 5B44 dual time base could chop between two X inputs (or not chop in the scarce dual-beam 5444 mainframe) but I don't have one to verify that and it's certainly out of scope for a 51xx scope app note. Perhaps the "dual x-y techniques" require mod 710R and the mod and 4114 app note go together? The catalog page: There is a Tek "engine analysis" book by Jim Thurman dated 1970 which narrowly predates the 51xx scope series. Anyone know anything more about any of this? |
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Re: 7S14/5S14N bias supplies: something to build on
#photo-notice
Hi TT,
Great idea;Thanks! can be done easier off site...I think you mean constructing something safely separate from the sampler board then simply attaching a finished widget to the sampler. Yes! And there's nothing on the back of the sampler board to hurt while soldering four (could be three) through-holes pins. And the existing cell tabs -- mine had flat ribbons soldered on top the through-hole pads which I think is normal -- can be desoldered by heat from the back too. Given reports that 1.55V silver oxide cells work, I plan to try a pair of LR44/357/1154 cell retainer clips on that gerrymander of perf board. But parts in the mail so no result yet. I wonder if the LED-LED solution with work with side-firing SMD LEDs, which could make a very tidy package -- and probably fit on a more simply shaped bit of perf than my example. But if making Ag cells simple to replace works out, I'll likely not ever get around to trying the LEDs myself. |
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Re: TLA700 - Logic Analyzer - PCMCIA->CD-ROM interface ...
Great!? I am happy you found a nearby source.? Good luck!? ? ? Jim?Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: "Ulf Kylenfall via groups.io" <ulf_r_k@...> Date: 12/7/21 12:36 AM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] TLA700 - Logic Analyzer - PCMCIA->CD-ROM interface ... Thank you.I have been offered a CDROM-Drive + PCMCIA adapter from Sweden.Will take it since the shipping as you say is expenceive.Will test the analyzer today and make sure that it works before I proceedany further.CheersUlf
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Re: 7S14/5S14N bias supplies: something to build on
#photo-notice
Great idea; it takes space, though, if you plan to use battery cells; helpful for LED-LED solution, can be done easier off site...
TT P.S. I posted this message here earlier, but I found it in another topic; maybe it was my mistake (not sure how) |
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Re: 10Mhz under frequency in 184 Time-Mark Generator
By the way, I wonder if someone could clarify one of the steps in Chapter 6. Paragraph 4.c. states:
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"Adjust L18 (Fig. 6-7) midway between the two signal maximum amplitude points." Does that mean that as the slug is moved through the coil, one should see two maximums and then set the the slug midway between those positions? I ask because I don't see two maximum values and, instead, the waveform changes somewhat as I move the slug but that's a bit erratic and not a smooth transition between two waveforms with maximums at both points. If I'm misunderstanding this, then if someone could straighten me out on that, I would very much appreciate it. Thanks, Barry - N4BUQ ----- Original Message -----
From: "n4buq" <n4buq@...> I'm checking the frequency at the output connector. I could also check it at |
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Re: 3.5" floppy disk drives for shipping
A home for the drives has been found.
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DaveD On 12/7/2021 11:34 AM, Dave Daniel wrote:
All, --
This email has been checked for viruses by Avast antivirus software. |
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Re: What is a 5B10 with Mod 711C?
So it looks like 710R is a mod to the mainframe. I wonder where (or if) I can find a service document describing these mods. I have a scope and time base with Mod 509C, which is not mentioned in the catalog, but the catalog specifies that the list of mods is partial.
I guess I'm cool with having a curio that doesn't work with any of my current scopes. -- Jeff Dutky |
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Re: 10Mhz under frequency in 184 Time-Mark Generator
I'm checking the frequency at the output connector. I could also check it at Q94 but I think that either way, I can't quite squeeze 10.000MHz out of the oscillator.
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Thanks, Barry - N4BUQ ----- Original Message -----
From: "David C. Partridge" <david.partridge@...> Don't measure the frequency at the xtal - you will pull it down a load. |
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Re: 10Mhz under frequency in 184 Time-Mark Generator
Don't measure the frequency at the xtal - you will pull it down a load.
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Measure at the output of the 1st gain stage (collector of Q94). David -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of n4buq Sent: 07 December 2021 16:30 To: tekscopes <[email protected]> Subject: Re: [TekScopes] 10Mhz under frequency in 184 Time-Mark Generator At cold start, with 0.1us selected, the output checked 9.9981MHz. After about a 90 minute warmup, the crystal can is warm to the touch, cycle time is much longer, and the output still checks 9.9981MHz. I was going on memory that the output frequency was 9.999x and that's incorrect. I'll have to check the components as well as the interaction of L9. I think I adjusted that for uniformity of the markers but I don't think I tried checking to see whether I can reach a compromise between L9 and C8 to get good results for both frequency and marker uniformity. Thanks, Barry - N4BUQ |
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Re: Recommended ventilation clearance around a 2465 scope
When I recap the 2465 series, I install a heat sink on the horizontal output IC. I take an expansion knock out from a PC case and drill 2 holes in it and bend it into a U shape for clearance from the case and use plenty of heat sink compound.
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3.5" floppy disk drives for shipping
All,
I have two old 3.5" floppy disk drives that I was going to toss. Then I thought someone might need one to repair a vintage instrument. What I have are (1) NEC FD1231M drive and (1) Citizen Z1D drive (these both came out of a desktop computer). If anyone wants one or both, they may have what they need for the cost of shipping from 32754 USA. Payment would be via PayPal to friends and family after I have shipped the package(s) and determined the exact shipping cost. If interested, please contact me off-forum at kc0wjn at gmail dot com. I will keep them around for a few days and then toss them if I get no responses. Thanks. DaveD -- This email has been checked for viruses by Avast antivirus software. |
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Re: 10Mhz under frequency in 184 Time-Mark Generator
At cold start, with 0.1us selected, the output checked 9.9981MHz. After about a 90 minute warmup, the crystal can is warm to the touch, cycle time is much longer, and the output still checks 9.9981MHz. I was going on memory that the output frequency was 9.999x and that's incorrect.
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I'll have to check the components as well as the interaction of L9. I think I adjusted that for uniformity of the markers but I don't think I tried checking to see whether I can reach a compromise between L9 and C8 to get good results for both frequency and marker uniformity. Thanks, Barry - N4BUQ ----- Original Message -----
From: "Eric" <ericsp@...> How long a warmup time are you giving the crystal before trying to cal. |
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Re: is this AU solder any good?
You can also find Tin/Lead/Silver solder, Radio Shack used to sell it and Kester still makes it.
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I would not use anything less than 2% Silver, higher is OK. Get a flux core specifically made for electronic work. You can find lots of vendors on ebay selling you enough to repair a couple scopes for $5. Paul On Tue, Dec 07, 2021 at 11:08:32AM -0500, Zentronics42@... wrote:
No it would not. This solder has no flux in it. It is plumbing not electronics solder. Take a look at the 268 line it is Tin/Silver/Copper and has the 3% silver --
Paul Amaranth, GCIH | Manchester MI, USA Aurora Group of Michigan, LLC | Security, Systems & Software paul@... | Unix/Linux - We don't do windows |
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Re: is this AU solder any good?
FWIW,
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This is the stuff I used on my devices ceramic strips.... I believe it meets requirements... Advertising copy is crap (particularly on parts-express's website) but the specifications seemed to be reasonable... David On Tue, Dec 7, 2021 at 11:11 AM <Zentronics42@...> wrote:
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Re: is this AU solder any good?
I almost forgot the Vintage Tek museum has a Tek training video posted about ceramic strip soldering. It can be found here
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Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of byterock@... Sent: Tuesday, December 7, 2021 10:58 AM To: [email protected] Subject: [TekScopes] is this AU solder any good? would the solid AQUABOND found here be good enough for working on ceramic strips found on the 500 series scopes?? Cheers |
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Re: is this AU solder any good?
No it would not. This solder has no flux in it. It is plumbing not electronics solder. Take a look at the 268 line it is Tin/Silver/Copper and has the 3% silver
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This is what I used to work on a bunch of the type 100 gear seems to work well. You will also need a powerful iron the ceramic strips can soak a surprising amount of heat. Zen -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of byterock@... Sent: Tuesday, December 7, 2021 10:58 AM To: [email protected] Subject: [TekScopes] is this AU solder any good? would the solid AQUABOND found here be good enough for working on ceramic strips found on the 500 series scopes?? Cheers |
David C. Partridge
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