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

 

Bruce,

If you were building a replacement for one of these delay relays (hypothetically speaking, maybe for a 533A), would it be enough to have a timer that cut a relay in after a fixed time? Is that really all that the delay relay is doing?

Might there be another way to determine when the heaters are at temperature, like by monitoring the current through the heaters, or even by directly sensing the temperature of the tubes themselves?

Just curious (though I am in the process of refurbing a 533A, and this may be useful information when I get to the point of applying power to the instrument)

-- Jeff Dutky


Computer interface to 576

Paul Amaranth
 

I know folks have been talking about this for a while and it looks like
someone actually did it.

https://www.ebay.com/itm/303606230408?hash=item46b0576d88:g:U7kAAOSwghpe9UW-

Description is a bit on the thin side and if you're going to go to all that
trouble it seems that you should calculate the parameters instead of making
you calculate them off the screen grid. Apparently you do get cursors, meh.

Disclaimer: no connection to whoever did it
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix/Linux - We don't do windows


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

Ronan
 

just one more thing...
yeah, right. It is pretty warm in my lab in Calif. today -- I attempted a full normalization just now, it succeeded. Perhaps this is more proof I need to do the real work now from great posts such as Mike/WZ5Q, Randy/AB9GO, Marcus/PP5MS (et al).

Now I'm thoroughly convinced I need to check PS voltages/ripple, and to order two batteries -- check the caps and do the due diligence. I am headed to the copy/print store to make printouts of the 11x17 schematics.

Appears surprisingly "normal": https://ibb.co/4f3jhKW

Thanks for your virtual patience,

R


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

Ulf Kylenfall
 

Dear all,

I have received datasheets in PM's off the list and also links in this thread.

Thank you all!

Cheers

Ulf Kylenfall


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

Ronan
 

Just one more tidbit (before I decide if I'm going to dig deep into it).

Enabling debug diagnostics and re-running the Frequency Normalization indicates this:

“ERROR in MAIN DAC OFFSET: Cannot center start spur”

Explanation: "Beginning at 10 MHz/div span, the start spur was located and
centered, then span was reduced. In 1 MHz/div span, the signal
could not be centered within 30 horizontal storage bits."

I have a “oddity”, a +30dB rise of about 70MHz width:

https://ibb.co/db150Tr 1486 MHz
https://ibb.co/5BLWK3D 1498 MHz
https://ibb.co/xh3kybp 1558MHz

Does anyone have an OCR of the 2712 Service Manual?

Thank you
Ronan


2 files uploaded #file-notice

TekScopes@groups.io Notification <noreply@...>
 

The following files have been uploaded to the Files area of the TekScopes@groups.io group.

By: udtmang@...

Description:
Has some data on the Amperite relays


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

 

Ulf,

I designed these into things about fifty years ago. The Amprite type numbers generally provided the data. For example a 117NO60 would indicate a 117-volt unit with normally-open contacts that would close 60-seconds after power was applied. These thermal delay relays were often used to delay the application of plate voltage until cathodes warmed up.

Bruce, KG6OJI


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

stevenhorii
 

Sorry - I included a graphic of the pinout on my first reply, but I guess
it was blocked.

Here's the Web site that has it - along with a link to download a PDF.

https://amperite.com/35119-thermal-time-delay-relay/

Steve Horii

On Sun, Jul 18, 2021 at 3:37 PM ulf_r_k via groups.io <ulf_r_k=
yahoo.com@groups.io> wrote:

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: 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.

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