Date   

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

JRN
 

W7pF,

when I began with Tektronix some years ago, one of the 1st names I've read was yours. I did't know TekScopes at that time.

Some thoughts:
Wouldn't it be good to...
- have one, two or three more moderators to divide work?
- find people who can help with TekScopes specific computer problems?
- talk with real friends face to face in private?
- sort SCRs or label boxes sometimes?
- not forget that many people want to help?

All the best


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

Ulf Kylenfall
 

At the Onsala Space Observatory, we had a LINC8 too. I operated it in ~1975/1976
as it was in used for processing data from the 25M telescope on 4 GHz.
I recognized the upside-down R561. Remember loading the tapes and also
the procedure to manually starting the boot-loader. Bottom left beside
all the data switches, there was a knob "Chime". Turning it on, the processing
could be "heard". If the system hang, the character of the sound would change.

The LINC 8 was salvaged from being scrapped and is on display at
the observatory today.

Ulf Kylenfall SM6GXV
SR Research Engr (Retired)
ex Onsala Space Observatory


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

stevenhorii
 

We had a PDP-12 in our lab years ago. We got it when another department was
discarding it and we adopted it. Ours had a different color scheme from the
LINC-8 systems, but it was the same machine. Ours had a A-D converter in
the rack above the scope - the same modified Tek scope that is in yours. We
played “Spacewar” on it (we did use it for some lab data acquistion work).
It had a pair of DECtape drives.

The engineer I shared the lab with left a couple of years before I did.
When I left, I left that PDP-12 behind along with Tek 585 and 547 (the one
scope I wish I had taken with me) scopes. I did take the 556 but it sat on
my bench at home unused. I sold it off at a hamfest (should have kept that
one, too). The PDP-12, a PDP-8 system (DF-32 disk, two DECtape drives, 8K
memory, high-speed paper tape reader and punch, plus the ubiquitous ASR-33
Teletype), and the Tek scopes were all offered to me. Since I didn’t take
it, it all went into storage in an area of the building that was slated for
then future development. When I visited a few years later, what had been
“shell” space had been fully developed. All that stuff got scrapped.

As I recall, that modified Tek scope in the PDP-12 had a separate
edge-lighted graticule. The plug-ins were the same in each plug-in bay and
were basically amplifiers to run the scope in XY mode.

Seeing the photos of the LINC-8 brought back memories of using those front
panel switches to key in the RIM loader so we could load the BIN loader
from the ASR-33 (slow and noisy). On the PDP-8, we still had to enter the
BIN loader, but could then load the RIM loader from the high speed reader.
If we were not doing a cold start, we could also start up from the DF32
disk or DECtape. I did use the Tek scopes for troubleshooting - usually the
Teletype and trying to look at the various timing signals in it or the
current loop interface when it wasn’t working right.

On Sun, Jul 11, 2021 at 23:02 Bob Rosenbloom <bobalan@sbcglobal.net> wrote:

I know this is a long shot, but I'm looking for an T5611-25 CRT for use in
restoring an DEC LINC-8 minicomputer.
It used a modified Tektronix 561B oscilloscope, with DEC plug-ins, and the
P25 phosphor CRT with no graticule.
The one in the LINZ has a badly burned face. A P7 or even P2 phosphor
would also work though would look
different than the original. So basically any slow phosphor and no
graticule.

Some cell phone photos of the LINC and scope are on my web site here:
http://www.dvq.com/dec-linc8/







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

pdxareaid
 

Glad you are ok Dennis. Your 1st post displayed a great sense of humor concerning all this - much respect.

my 2 cent response to a great list:
- It's completely off-topic
# yes, but the humanity frequently displayed in this forum is not.
- It objectifies Dennis and his experiences
# BINGO
- Contents of posts may spread uncontrollably
# What? BTW: my cat... more later :-)
- With Dennis being our moderator, how/when can/should he moderate and cut the off-topic thread, should he decide in favor of that?
# Very insightful!
- 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.
# Agree. See objectified comment above.

One note if I may: (from personal experience without making this about me) While knowing one is not alone is very helpful, there is the potential for well meaning concern becoming a burden, requiring response at a time when response is difficult. And there is the privacy issue that might be difficult to fathom unless you have been the object of inquiry, though I bet many here get that, having been around long enough to have their own stories.


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.

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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.

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