Date   

Re: Looking for an T5611-25 CRT (or -7 or -2)

Bob Rosenbloom
 

Thanks for all of the options, gives me a lot more part numbers to search for. It turns out my CRT is marked T5032-25 on the glass and T5611-25 on a label so I guess it could use either one.

Glass or ceramic is fine, I just need the slow phosphor and no graticule.

It's interesting that none of the part numbers show the P25 phosphor that's actually used in the scope I have. May have been a special order by DEC. A P7 would be the next best choice. I did buy a ceramic P2 phosphor CRT with graticule off of eBay just to have something to play with until I can find the more correct no graticule one.

Thanks!

Bob


Re: What do you do when you get a call from AUSTRALIA

Harvey White
 

It can be helpful to mix long term complex projects with some short term things where you can point at an immediate (or close) success.  Sometimes you get tired of working on the same thing for month after month.

Harvey

On 7/12/2021 11:05 AM, Jeff Dutky wrote:
I would like to second Ananda's suggestion of "puttering" as a treatment, if not a cure, for depression. Just as it is helpful to have several tasks (in a hobby, or at work) that engage different "gears" of the intellect, so that when you have exhausted one mode of thinking you can rest while exercising another (for me, at work, it's the difference between hard analytic problems, like writing a new program, or analyzing existing program code, and writing a set of data for test cases, which is voluminous and detailed, but does not require the same kind of intense concentration that reading and understanding program code does).

When I'm depressed I find it hard, if not impossible, to concentrate on analytical tasks, but I can do more "menial" tasks, like sorting through piles of things. One of my own therapy activities, since I joined TekScopes, was to buy a pack of 50 cardboard stock boxes, and whenever I'm feeling overwhelmed with things (literal things, as is piles of loose stuff) I pull out a couple of stock boxes and start filling them with items that go together in some category. Then I label the filled box with the category name. It combats the depression both by giving me something to focus on, and by reducing the clutter in my office: the palpable progress gives me some kind of dopamine hit, or something.

This is just a bit of "self medication" that I've learned over the course of decades. I wonder if this is something that is recognized in therapy circles.

-- Jeff Dutky





Re: TDS-540B Repair?

Harvey White
 

The display is a standard magnetically deflected monitor.

There are some tricks if you have some shaky hands, and that's to do what artists do, which is a palm or wrist rest while working.

Harvey

On 7/12/2021 11:29 AM, Jeff Dutky wrote:
The fact that heat and vibration "cured" the CRT issues suggests a bad solder joint or connector contact, so that should be eminently repairable. You might even be able to fix it merely by careful disassembly and reassembly with cleaning of all contacts with IPA. The dead high impedance on channel 1 may be a bit more work, but I expect it's down to replacement of a now shorted component early in the input channel. I see from the TekWiki that the TDS540 is all SMD construction, so it's not easy work for people with failing eyesight and shaking hands.

The display appears to be a regular raster display, not a traditional electrostatic deflection CRT, so replacement with an LCD does seem like an excellent option.

-- Jeff Dutky





Re: the dreaded letter from the County Property Appraiser (somewhat OT reply)

Jim Strohm
 

John,

IANAL but -- if you can sell those limited common elements without selling
the real property, then those elements are separate from the real property
and their value is zero for the purposes of this inquiry from the tax
assessor.

If those limited common elements MUST transfer with the title of the real
property, then they have a taxable value. If you cannot legally generate
income from them, and if you don't receive tangible assets or value from
them, then they're worth ... a dollar.

I don't know where you are, but you should find out what other people in
your neighborhood have valued them at. For example, if you have a covered
parking space in Manhattan, it's easily worth $250 a month whether you use
it or not. Here in Austin TX, it's "pull (or push) your car into the back
yard, throw a tarp over it, and tell your neighbors to <scribbled-out word>
themselves." The value is the price of the tarp, plus the 100 square feet
of lawn you won't have to mow per car. For me, that's 16 cents per mowing
(4 vehicles on the lawn @100 sqft each). I guess the jet boat adds another
4 cents. This is at $50 to mow about 100,000 sqft of lawn on a
quarter-acre city lot.

Edging around them costs me more time than mowing, so my taxable value is
nil.

So basically you need to see what your situation is. Without other
guidance, you may want to ascribe some nominal value to those limited
common elements just to keep your assessor happy. Or -- burn a few dozen
hours of their time to make them clarify the request. Their loaded hourly
rate is at least a hundred bucks an hour, and those limited common elements
would have to be worth more than a hundred grand taxable value for them to
get their costs back after you're done with them.

73
Jim N6OTQ


Re: What do you do when you get a call from AUSTRALIA

Vince Vielhaber
 

Great hearing from you again Dennis!

Vince.

On 07/12/2021 12:37 AM, Dennis Tillman W7pF wrote:
Yesterday was a really nice day.
The temperature was perfect, the sun was out.
I was on the deck of our little summer house working on my computer.
In front of me across an inlet of Puget Sound I can see snow covered Mt
Rainer 40 miles away.

Suddenly my cell phone rings.
Annoyed! I pick it up to look at the screen and it says in all capital
letters:
AUSTRALIA
Underneath that seemingly giant word is a strangely formatted phone number.
That strange format could only belong to an international telephone number.

This is exactly what my brain said to me in the next 2 seconds between the
2nd and the 3rd ring.
"Holy Crap!"
"It's a mistake"
"I don't know anyone in Australia"
"It's a robo-call. It must be"
"Wait a minute, nobody makes robo-calls from Australia"
"The number format means it really might be coming from Australia"
"Why would anyone want to call me from Australia"
"It's a new trick by the robo-callers to get people to answer and listen to
their recordings"
"They must have mis-dialed"
"They accidentally sat on their phone and pressed a bunch of numbers at
random"
"I don't know anyone in Australia" (that was the second time my brain said
this to me to make sure I got the point)

Then my brain shut up for a moment while it waited to see what I would do
next.
I realized someone probably went to a lot of trouble to find me. So I
answered.

ARGH! It was someone from TekScopes who was very concerned that I was OK
because I disappeared about 4 weeks ago without a trace. We had a very long
talk about what was going on. I was in a depression and couldn't get out of
it. I was overwhelmed with all the things going on in my life - most of them
it seemed to me were going badly. I have suffered from depression almost my
entire life. Until I was in my late 40s I had no idea this was the case. By
then I spent several years in therapy with several different therapists and
eventually one Psychiatrist I was seeing worked out the right balance of
medications for me to take for the rest of my life to help me avoid falling
into another depression. Depression is a learned behavior and the real
danger about it is that the more it happens to you the easier it is to
become depressed. Once I am in one it is like a trap and I can't get out.

But the phone call and the conversation I had with the caller - he said his
name so fast I didn't have a chance to get it was wonderful. He understood
completely what I was going through. That call made it possible to spend
most of today catching up on my email and facing the world once again. I'm
still a little shaky (mentally) but I think (I hope) I will be on my feet
again (mentally) in a few days.

In the meantime I would like to thank Michael Dunn for covering for me. He
and I both agree I could use help with TekScopes because it beginning to
take up too much of my time (that was one of the things I was not able to
spend enough time on but I didn't know how to fix it).

Give me a few days to get caught up
Dennis Tillman W7pF
Thank you for your concern!!!
That really means a lot to me.
I'm happy to be back!!!
Who was it that called me all the way from Australia. I need to thank them
personally.






--
Michigan VHF Corporation -- nobucks dot net
K8ZW - http://www.hamradio.fun


the assessors note

John Ferguson
 

Hi Gang,

Please ignore my missent query about property tax.

john


Re: What do you do when you get a call from AUSTRALIA

 

On Mon, Jul 12, 2021 at 05:05 PM, Jeff Dutky wrote:


When I'm depressed I find it hard, if not impossible, to concentrate on
analytical tasks, but I can do more "menial" tasks, like sorting through piles
of things. One of my own therapy activities, since I joined TekScopes, was to
buy a pack of 50 cardboard stock boxes, and whenever I'm feeling overwhelmed
with things (literal things, as is piles of loose stuff) I pull out a couple
of stock boxes and start filling them with items that go together in some
category. Then I label the filled box with the category name. It combats the
depression both by giving me something to focus on, and by reducing the
clutter in my office: the palpable progress gives me some kind of dopamine
hit, or something.

This is just a bit of "self medication" that I've learned over the course of
decades. I wonder if this is something that is recognized in therapy circles.
While I highly respect everyone's well-meant involvement and attempts to help, at the early stages of what might evolve into a long off-topic thread, I'll throw my 2 cents at it and recommend strongly against going this path any further, for the following reasons:
- It's completely off-topic
- It objectifies Dennis and his experiences
- Contents of posts may spread uncontrollably
- With Dennis being our moderator, how/when can/should he moderate and cut the off-topic thread, should he decide in favor of that?
- The familiar lack of distinction between being depressed and (clinical) depression, common with laymen and non-patients, already popped up. These are *very* different things. From what Dennis told us, it's extremely likely that the latter applies to him. Again, I recommend - without any authority to enforce - to not touch this.

More in general, I'm strongly against home-brew psychological or even psychiatric musings or advice.

I very strongly feel that we've helped Dennis so far, which led him to open up. That's where to stop.

Raymond


Re: TDS-540B Repair?

 

The fact that heat and vibration "cured" the CRT issues suggests a bad solder joint or connector contact, so that should be eminently repairable. You might even be able to fix it merely by careful disassembly and reassembly with cleaning of all contacts with IPA. The dead high impedance on channel 1 may be a bit more work, but I expect it's down to replacement of a now shorted component early in the input channel. I see from the TekWiki that the TDS540 is all SMD construction, so it's not easy work for people with failing eyesight and shaking hands.

The display appears to be a regular raster display, not a traditional electrostatic deflection CRT, so replacement with an LCD does seem like an excellent option.

-- Jeff Dutky


Re: What do you do when you get a call from AUSTRALIA

 

I would like to second Ananda's suggestion of "puttering" as a treatment, if not a cure, for depression. Just as it is helpful to have several tasks (in a hobby, or at work) that engage different "gears" of the intellect, so that when you have exhausted one mode of thinking you can rest while exercising another (for me, at work, it's the difference between hard analytic problems, like writing a new program, or analyzing existing program code, and writing a set of data for test cases, which is voluminous and detailed, but does not require the same kind of intense concentration that reading and understanding program code does).

When I'm depressed I find it hard, if not impossible, to concentrate on analytical tasks, but I can do more "menial" tasks, like sorting through piles of things. One of my own therapy activities, since I joined TekScopes, was to buy a pack of 50 cardboard stock boxes, and whenever I'm feeling overwhelmed with things (literal things, as is piles of loose stuff) I pull out a couple of stock boxes and start filling them with items that go together in some category. Then I label the filled box with the category name. It combats the depression both by giving me something to focus on, and by reducing the clutter in my office: the palpable progress gives me some kind of dopamine hit, or something.

This is just a bit of "self medication" that I've learned over the course of decades. I wonder if this is something that is recognized in therapy circles.

-- Jeff Dutky


File Notifications #file-notice

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

Richard Peterson <saaber1@...> added folder /P6430 Temperature Probe Instruction Manual


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

By: Richard Peterson <saaber1@...>


Re: TDS-540B Repair?

Christopher Maness
 

Thanks, I did not know such a thing existed. Linky?

Chris KQ6UP

On Mon, Jul 12, 2021 at 7:23 AM Stephen Hanselman <kc4sw.io@kc4sw.com> wrote:

Buy the LCD replacement soooo much easier.

Regards,

Stephen Hanselman
Datagate Systems, LLC
On Jul 12, 2021, at 05:13, Christopher Maness <christopher.maness@gmail.com> wrote:

The CRT went intermittent with brightness and vertical spread last week. I put it in my car hopping that a friend of mine would take a look at it. He did not want to bother, so it rode around in my car in the heat. The hot bumpy car ride seems to have fixed it at least temporarily, so it could be something simple like card contacts a little dirty. It also took an ESD hit on channel 1. The channel still works, but is no longer high impedance. Was wondering if there is a good tech in the SoCal area. If not, I am willing to box it up and send it to one based on recommendations.

Thanks,
Chris Maness








Re: What do you do when you get a call from AUSTRALIA

Ananda
 

Dennis,

Glad to hear you are OK. I was silently praying that we will hear from you at some point. Please do take care of yourself. Staying involved should also help you to a great extent. When I feel overwhelmed, I simply go to my "office room" Where I have my work table and start something new or sort out parts, nut and bolts etc. to make me relax. Hey, the time is well spent also!

With best wishes and kind regards.

Ananda


Re: TDS-540B Repair?

Stephen Hanselman
 

Buy the LCD replacement soooo much easier.

Regards,

Stephen Hanselman
Datagate Systems, LLC

On Jul 12, 2021, at 05:13, Christopher Maness <christopher.maness@gmail.com> wrote:

The CRT went intermittent with brightness and vertical spread last week. I put it in my car hopping that a friend of mine would take a look at it. He did not want to bother, so it rode around in my car in the heat. The hot bumpy car ride seems to have fixed it at least temporarily, so it could be something simple like card contacts a little dirty. It also took an ESD hit on channel 1. The channel still works, but is no longer high impedance. Was wondering if there is a good tech in the SoCal area. If not, I am willing to box it up and send it to one based on recommendations.

Thanks,
Chris Maness





Re: Tek 2230, Alternatives to the cursor control pot.

Albert Otten
 

On Sun, Jul 4, 2021 at 05:34 PM, Pitpat wrote:


The point is that I couldn't find any direction on how the original
potentiometer works, from my understanding the dual 10k ohm variable works in
opposition so that there's no "dead zones" caused by the 360 degrees of
rotation but thats all...
Hi Federico,

Any progress so far?
It's true that the pots work in opposite directions. In my 2232 this is achieved by interchanging assignment of 0V and +5V to the terminals. With an ordinary dual pot this would not prevent dead zones to occur simultaneously for both wipers. The trick here is that one wiper is rotated w.r.t. the other. Not over 180 degrees what I expected, but enough to avoid simultaneous dead zones.
When there are no simultaneous dead zones the processor can always determine the direction of knob rotation. I don't see the purpose of opposite directions.

Albert


Re: Looking for an T5611-25 CRT (or -7 or -2)

Keith
 

Hi Bob,

If you really need a 561b CRT, then the TEk part number you would seem to need is 154-0614-00

That’s external graticule, Standard p31 phosphor and Standard B14-38 basing.

Note that the -01, -02 and -03 versions of this 154-0614-xx part number are electrically and physically the same, except P2, P7, and P31 phosphors

Is your CRT ceramic? Can you accept a glass CRT?

If so, there is an electrically equivalent earlier CRT, in glass, the T5032. There are about eleven TEK T5032 part numbers that would appear to me at first glance to work, if the glass vs. ceramic thing doesn’t blow up your world.

See them, here: https://w140.com/tekwiki/wiki/T5032

The first eleven p/n have external graticule. Some phosphors are “better” for you than others.

I see at least one complete 561b on fleabay - being parted out. That’s here, and looks like it might be an external graticule CRT.

https://www.ebay.com/itm/192947024206?_trkparms=ispr%3D1&hash=item2cec89f14e:g:2G0AAOSwqrNgCbE1&amdata=enc%3AAQAGAAACkPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSd3M8ngECaRA0SmyU4KT%252FnoWoOfkiFaIW2SJ8lxc2ql%252Bb5XWyxfgDJaThucyAKkrugV0zON4FNfd7a6vwaJdBMsTZkoiO6Jh%252BlD8lWxl90KMRRKnk4jNtjM8BnNwk%252BQ8z9e0HakfOXn9jQ0JiF7vDVG7opKEeF%252B9efKKpTnfnEwIiBWStepSxEWv%252FuSo8zjqpQPOP%252FaiPxd%252Bvp3y4fSezT8OnjmYWzwfzqXgRHuWqb85h6FzSu5j%252FPPgFbIiq2MFCsHOW4y8YCmJyJJDWBfnpA1SyeuZFtmzLLuVsLStUfvwWEDg9RK%252FT1abwuCxYvr%252BzzCp6cfdWjMh1ph3dnAoJHMGljHdYfO4jjXqsXWHn3e78xK%252B2aPcS18m3Etv7YaQgkbgHej587Al7sJqV0gexCevefT2Rv3DG7VopNJqbaDLxLiLAyeuqFX40vbwwEB8ruYUhwfOwaKc%252FYJ2EMjwI7hQIPbP0NwRlbg9geHHe0mzd6%252FGaKz9gt4NYzPju9tkEU5J9MiAlp8uDRNuZpr2FC3AhzfCcM21HLaOMEmyxnqQSaC3Hf4tGD2SJLIEgJSnrZWTGU9ifzRfbO%252BOXohPymi%252ByJFbvWibs01vmF0od4HHmb6nEA%252B%252BmPEQ%252FRfWFQaKracYWfVBH9jCRL1Bc86%252Bm4T5iKMneKGHsHRBejgLV8XsyrGX0ov8p0tKVPOpxQcRXMWeAk1gdVVKNX7DdwrFM6eS%252BFjYJncYqIFgZTbxH%252Fj3IlRkP2oqyehJf58paouetUd1uCgeciNBQIqsd9ieegBQ7V9A1Oh%252FdT9gqJVk6YqPjp9a8dgeBtyeK7rWZM%252Bt3%7Campid%3APL_CLK%7Cclp%3A2334524

Hope this helps


Re: Calibrate the time base, or horizontal amplifier?

Tom Phillips
 

My understanding is that the frame calibration is to ensure the scope
frames are identically calibrated which you would want if swapping plugins
between frames.


TDS-540B Repair?

Christopher Maness
 

The CRT went intermittent with brightness and vertical spread last week. I put it in my car hopping that a friend of mine would take a look at it. He did not want to bother, so it rode around in my car in the heat. The hot bumpy car ride seems to have fixed it at least temporarily, so it could be something simple like card contacts a little dirty. It also took an ESD hit on channel 1. The channel still works, but is no longer high impedance. Was wondering if there is a good tech in the SoCal area. If not, I am willing to box it up and send it to one based on recommendations.

Thanks,
Chris Maness


Re: Dennis Tillman

 

Yeah, a fall detector is definitely something you should buy if you're
concerned. It doesn't cost so much and it's definitely comforting and
helpful.

On Mon, Jul 12, 2021 at 10:06 AM Tom Gardner <tggzzz@gmail.com> wrote:

On 12/07/21 02:53, Richard R. Pope wrote:
I am up there in years and my body no longer works correctly. I could easily
fall and hurt myself and not be able to call for help!
That's a common problem. Over here there are services where you have button on
your wrist or around your neck, and a box connected to the phone line. If you
press the button it calls a service centre and someone comes to help. My mother
had one for years, and it was a great comfort to ME :)

There are also many other devices available, e.g. those which sense movement in
the building (to verify you are up and about) and accelerometers that detect falls.





Re: Calibrate the time base, or horizontal amplifier?

emissionlabs
 

Thank you for the many inputs.

I am looking for a way to calibrate this 5113 scope without dedicated calibrators. Otherwise it becomes too much for me, just for this one time action. I can use an Agilent 33120A digital controlled oscillator, and a 34301A 6 digit multimeter with build in frequency counte, a stabile DC power supply and an HP pulse generator. Even the build in 100Hz signal calibration signal, derived from the mains is a good time reference.

I can input signals directly on the scope boards if needed, or tap signals there. I understand with a 100MHz scope it can not be done like that. The 5113 is just a low frequency scope, and the equipment I have can do much higher frequency than the scope itself.

Having repaired the HV circuit, it is not possible to say what the HV was before, but it was over 3530V after the repair. So I set it to 3400V, by the book. Changing the HV, from what I know, does change the size of the projected picture on the CRT.

Any good hints before I start are much appreciated.


Re: What do you do when you get a call from AUSTRALIA

 

Hi Dennis,
I'm so glad you were helped by a member who took the time to give you a call - probably at great expense.

I had a bad accident in 2005 that changed my life. Several people I interacted with on another web site where I am a moderator sent me messages, and that helped. What really helped was a two pronged thing. First, some called me as you were called. The best thing was I resumed helping people on that web site. The very best medicine is helping total strangers - or acquaintances with your skill set.

Today I am able to do more, but has severe limitations to deal with. My wife died a year and change ago, but continuing to help people has allowed me to get through all this. Today I have a girlfriend and things are looking pretty good. This would not be possible without the opportunity to lend a hand to my fellow human being. Just know you are appreciated and people care for your well being. You do make a difference in people's lives Dennis.

-Chris

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