Date   

Re: Looking for data on 9-pin Vacuum time delay relays used in old Tek-scopes

Albert Otten
 


Looking for data on 9-pin Vacuum time delay relays used in old Tek-scopes

Ulf Kylenfall
 

Dear forum,

I have been trying to find datasheets for the Amperite time delay relays
used in older Tek scopes. They are built in 9-pin tube glass envelopes.

Looked in w140.com but maybe not long enough to find any.

No hits by simply googling the type number...

Is there someone who knows where to find specs?

Cheers

Ulf Kylenfall
SM6GXV


Re: What's another good plugin to get for a 544 with 1A1?

snapdiode <snapdiode@...>
 

1A4 is nice but needs some care, the large amount of wafer contacts need cleaning, and there's a lot of point-to-point wiring that can go bad. I even had a joint that was not soldered from the factory. Also it contains rare dual JFETs, and the overall design is difficult to repair and easy to damage, there's 4 channels crammed into that plugin. Maybe a nice 1S1.

But the days of trawling eBay for low price plugins were 10+ years ago. Prices are absurdly high now.


Re: 2712 SA with display (and normalization) issues #photo-notice

Ronan
 

I should have added that I would like to fix this one as it has the SA option

Image of the Options/Firmware: https://ibb.co/M2vZfF5

THANK YOU!
Ronan


2712 SA with display (and normalization) issues #photo-notice

Ronan
 

Greetings Tekkies!

I've got a 2712 SA -- it had been sitting in storage some years (unknown time). When I plugged it in, the traces & text was shifted below the bottom of the display area. I let it run a couple hours; the trace & text eventually wandered up to and just above the top of the display area. The trace/text is sharp and bright, but the text is distorted especially near the top left and right extremes; and it varies.

Here are two images -- the normalization failure and the distorted text (which isn't always quite as bad as this example).

Distorted text: https://ibb.co/sbYzpqR
Normalization issue: https://ibb.co/ZLGTM74

I was able to get Normalization to succeed once earlier today - running complete normalization twice in succession. I then I began exploring, doing some very basic tests, after that I reset it to defaults [Util / 1 / 1] , ran the Normalization again, wherein both the Voltage and Amplitude normalization failed.

I'm reading previous posts that I should start by replacing the battery. I will pursue that and as well attempt to become familiar with the Service manual. Also I read there are some SMD-size Electrolytic I may want to check and of course power supplies.

Should any of you worked on one of these and found the same two symptoms (sometimes Normalization succeeds and other times not -- along with distorted Text and display drifting vertically after time) -- please let me know.

Thank you kindly!!

Ronan


Re: Members in Germany, Brussels, and the Netherlands affected by the floods

Stephen Hanselman
 

All right enough of this bullshit

Regards,

Stephen Hanselman
Datagate Systems, LLC

On Jul 18, 2021, at 07:55, David C. Partridge <david.partridge@perdrix.co.uk> wrote:

Any more Climate Change denial or defense posting will result in the offenders being placed on moderation.

Please keep politics etc. out of this group.

David Partridge (Group Moderator)






Re: Members in Germany, Brussels, and the Netherlands affected by the floods

Mlynch001
 

On Sun, Jul 18, 2021 at 09:55 AM, David C. Partridge wrote:


Please keep politics etc. out of this group.
Amen!
--
Michael Lynch
Dardanelle, AR


Re: ++Processor error on TDS 754D on startup

BobH
 

Which Dallas module are you needing? Is it one of the ones that are just battery backed RAM or does it have a clock in it as well? If it is just RAM, how large is the RAM?

BobH


Re: Power transformer 453A

Mark Vincent
 

Fred,

The voltages on the secondaries of mine with the input set on the high range at 120V mains input: Pins 21 and 22- 6,3V
Pins 12 and 13- 17,4V
Pins 10 and 11- 18,6V
Pins 13 and 15- 90V
Pins 16, 17, 18, 19 and 20- 71, 59, Gnd. 59 and 71V
With slight line variations, the voltages will vary slightly. Voltages were measured with the loads applied and the 6,3V with graticule set at minimum so the a-c voltage at these pins is higher than the nominal 6,3V. This is a 6,3V winding. I would guess the other power transformers you mentioned would work. The 454 type may have a heavier winding for the heaters in the older S/N types. That is fine. The only thing that may be the difference is the current and slight physical size difference. If you can get one, it should work fine.

Mark


Re: Members in Germany, Brussels, and the Netherlands affected by the floods

 

Any more Climate Change denial or defense posting will result in the offenders being placed on moderation.

Please keep politics etc. out of this group.

David Partridge (Group Moderator)


Re: Members in Germany, Brussels, and the Netherlands affected by the floods

-
 

Sorry, I know that this is OT but I have to add my 2 cents worth here.

I live only a few miles from a beach on the Atlantic coast of Florida
and I've been visiting this area or living here and/or along the gulf coast
since the mid 1950s and the ocean levels have *not* risen here to any
noticeable degree in the last 60+ years. The Spanish began building their
fort at St Augustine in 1672 and finished in 1742 and neither it or the
ancient forts at Puerto Rico and elsewhere in the Caribbean have sunk
beneath the waves.

We know from records that the Vikings settled in Greenland before the
year 1000 and settled briefly in Newfoundland less than a century later. In
modern times (from the 1600s up until the 1960s, both of those voyages were
considered *impossible* due to the amount of sea ice along that route and
the Viking tales were disregarded until the remains of Viking settlement at
L'Anse aux Meadows, Newfoundland was discovered in the 1960s. Modern
archeology has PROVEN that the Vikings did indeed make those voyages and
settled in both places. Records and archaeology also prove that in about
1500, the Viking settlements in Greenland failed and that everyone there
died, due to worsening conditions and drastically colder weather. My point
is that we know from both historical records and from archaeological
evidence that even within the last 1000 years the north Atlantic has
experienced both much walmer and much colder climates than today. And the
world didn't end then (unless you were a Viking in Greenland!). I don't
think that there's any question that the weather has gotten warmer over the
past few years but the key question is whether it's part of a natural
climate shift or something due to man.

Considering that in the 1700s, 1600s, 1500s and earlier, everyone,
worldwide, was cooking and heating with wood or coal or peat (all of them
composed of mostly carbon) and in open fire pits or fireplaces I *seriously*
question the argument that we today are generating more CO2 and thus
causing more global warming, than we were 2, 3, 4, 5 or 6 centuries ago.

That's my perspective based on history; and not on either sides'
political arguments.

On Sat, Jul 17, 2021 at 9:56 PM George Onufer <amatec@att.net> wrote:

I’m sorry but the biggest polluter in the world is a communist
dictatorship. And they have stated unequivocally that they are not
reducing output but rather they intend to increase it.Sorry again but there
is zero PROOF that a few degrees of temperature change is generating
floods, hurricanes, wildfires or any other catastrophes. You are being
manipulated into accepting the new world order on the flimsiest evidence
imaginable. We were told 15 years ago that Manhattan Island would be
underwater by 2020. Sea level there has changed about 3 inches. There are
a slew of possible explanations for the slight temperature changes
including the most likely culprit, solar cycles. I know the chicken
littles out there have convinced themselves, but a little independent
research wouldn’t hurt.
George


Sent from AT&T Yahoo Mail for iPhone






Power transformer 453A

Fred Schumacher
 

I recently got a 453A with a shorted power transformer. This short is at the primary side to earth.
As the technical manual does not specify the secondary voltages, I am looking for someone who can inform me about this.
I know the 435 and 454 have similar dc power circuitry connected to these transformers, so I wonder if a transformer from these scopes could be used. I noticed the cooling fan is connected to the secondary side as for the two other models, it is connected to the primary 115V side.
Any help would be appreciated.
Thanks in advance.


Power transformer 4453A

Fred Schumacher
 

I recently got a 453A with a shorted power transformer. This short is at the primary side to earth.
As the technical manual does not specify the secondary voltages, I am looking for someone who can inform me about this.
I know the 435 and 454 have similar dc power circuitry connected to these transformers, so I wonder if a transformer from these scopes could be used. I noticed the cooling fan is connected to the secondary side as for the two other models, it is connected to the primary 115V side.
Any help would be appreciated.
Thanks in advance.


Re: Binding Post Thumb/Head Nut Replacements

tgerbic
 

Jeff,

These would be pretty easy to make on a small home metal lathe either from steel pipe or rod, if you had one as an example. Not sure where you are located but there might be someone near you on one of these these electronic forums that probably has a second hobby (automotive, machining, etc.) using a lathe. You could end up with a near exact match. A 1/4-28 NF tap is less common than a 1/4-20 NC but are still pretty cheap (~US$3 online).

Regards


Re: Binding Post Thumb/Head Nut Replacements

EricJ
 

Don't forget that you could add washers under the nuts to help extend the length of threaded shaft that it keeps covered/protected.--EricSent from my Galaxy

-------- Original message --------From: Jeff Dutky <jeff.dutky@gmail.com> Date: 7/18/21 12:56 AM (GMT-06:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Binding Post Thumb/Head Nut Replacements I just received my shipment of brass threaded inserts and they are slightly shorter than the proper thumb nuts, but they are still more than adequate replacements. They do not interfere with nearby connections, and they are not nearly as ostentatious as I had feared they would be. Their length means, however, that they would not protect the ends of the hollow shaft of the binding post like the original thumb nuts do (which are slightly longer than the shaft they thread onto).I have one more shipment of candidate parts coming. I will report back once they arrive.-- Jeff Dutky


Re: Binding Post Thumb/Head Nut Replacements

 

I just received my shipment of brass threaded inserts and they are slightly shorter than the proper thumb nuts, but they are still more than adequate replacements. They do not interfere with nearby connections, and they are not nearly as ostentatious as I had feared they would be. Their length means, however, that they would not protect the ends of the hollow shaft of the binding post like the original thumb nuts do (which are slightly longer than the shaft they thread onto).

I have one more shipment of candidate parts coming. I will report back once they arrive.

-- Jeff Dutky


Re: Members in Germany, Brussels, and the Netherlands affected by the floods

 

Thomas,

The problem with Step 3 is that when a lot of our physical infrastructure was built, prior to the 20th century, you HAD to build industrial centers near water because that was your main source of power, and the best method of transporting materials in and out. Even after the construction of railways, invention of the steam and diesel locomotives, and the harnessing of electric power, lots of industries needed an efficient means of evacuating waste heat from their factories, and a waterway was convenient and effective. Other businesses, and the people who worked in them, built near the industrial centers as well, and that is where we find ourselves today.

Addressing climate change, or addressing our vulnerability to it, is going to be unavoidably expensive. The only question is whether it will be more expensive to do nothing. Also, yes, there are considerable geopolitical difficulties in addressing climate change, including a thorny free rider problem (or maybe it's a prisoners dilemma), as well as considerable headwind from the sunk cost fallacy. Maybe some tragedy of the commons too, but it's been a long time since I took macro economics and I don't bother to recall most of it.

In the meantime, we have to address the problems when and where they happen, because we can't just snap our fingers and have everyone moved out of the way of potential harm, no matter how foreseeable that harm might be. My personal policy, in response to these kinds of disasters, is to give to established aid organizations, because money moves easier than goods, and the aid orgs have the logistics in place to efficiently transform money into action on the ground.

-- Jeff Dutky


Re: What's another good plugin to get for a 544 with 1A1?

Sean Turner
 

John,

There's also the Type 1A2 that is roughly the same thing as a Type CA in terms of functionality (quite a bit wider bandwidth though). I have one that came with my Type 547 estate sale find, and I'm really not using it much. Would consider a trade for other stuff. :o)

Sean

On Sat, Jul 17, 2021 at 04:21 PM, John Griessen wrote:


lucked onto a 544 advertised in the Santa Fe craigslist.
The 1A1 seems good for most use cases. mine is "The third model, from ???
until the end has four-sided V/cm knobs and a FET front-end."
https://www.ecosensory.com/tek/box_LG025-J1-tek-544-1a1.jpg

1A4 seems good for emulating Jim Williams with lots of traces displayed...

1A5 seems like a fine one, and can use the P6046 diff probes, (but I'd have to
do the cal for P6046, which is long and detailed, and I have P6046's already
matched to amps that stay together and work in any scope.)

1A7A would be nice -- same features as 7A22, more sensitive than the 1A1...


Re: Members in Germany, Brussels, and the Netherlands affected by the floods

George Onufer
 

I’m sorry but the biggest polluter in the world is a communist dictatorship.  And they have stated unequivocally that they are not reducing output but rather they intend to increase it.Sorry again but there is zero PROOF that a few degrees of temperature change is generating floods, hurricanes, wildfires or any other catastrophes.  You are being manipulated into accepting the new world order on the flimsiest evidence imaginable.  We were told 15 years ago that Manhattan Island would be underwater by 2020.  Sea level there has changed about 3 inches.  There are a slew of possible explanations for the slight temperature changes including the most likely culprit, solar cycles.  I know the chicken littles out there have convinced themselves, but a little independent research wouldn’t hurt.
George


Sent from AT&T Yahoo Mail for iPhone


Re: Members in Australia

Ken Goodhew
 

another covid free new south welshman from mount warrigal ,wollongong.
VK2TKE

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