开云体育

On Tuesday 20 February 2024 01:44:29 pm Jean-Paul wrote:

Google drive has 100s images in the folder, NO thumbnail must DL and view.

I just clicked on the first pic and it was displayed, then used the right arrow thingy to browse through them.

Expected prices would be nice, though.

--
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

Rabbit hole!? ? ? ? ? ? ?Jim Ford?Sent from my T-Mobile 4G LTE Device

My Tektronix TDS 420 A has two broken parts, i.d.
1) Netfilter, a Schaffner FS4013 - 4 - 05
2) Transistor from the power supply module, a Motorola MJW 16010 AT 440
Can someone help me with finding these parts for a reasonable price?

Hi Jared,

Any chance you found the answer to this?

Thanks,
Evan

On Sat, Dec 30, 2023 at 7:01?PM Jared Cabot via groups.io
<jaredcabot@...> wrote:

As far as I know, Tek never used the fancy features in these NVRAM chips.
I have replaced a few NVRAM's with the FM16W08-SG FRAM, but I'm not sure if I've replaced a DS1645Y. I'll have to check once I'm back in the country in a week or so.


Jared

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There seems to be a resurgence in analog computer interest. I bought an EAI
TR-20 years ago surplus. It came with extra patch boards but few patch
cables. It's a beast - weighs over 100 pounds but so far I have not used
it. I do have a smaller, lighter "hybrid" Comdyna. It has both an analog
computer and a digital one in the same rack. It weighs a lot less. The
TR-20 will likely need work before powering it up - old capacitors and the
like. The Comdyna is much more recent and works fine though I've only done
some minimal programming for it. I jumpered together an integrator and
differentiator to try things out. This is where having a scope is useful to
look at the output. I have not used the digital side.

Some of these old EAI machines are fetching a surprisingly high price. A
friend of mine has one and he rebuilt the power supply. He also had to
rebuild some of the analog processing modules. He got it working and uses
it as a music synthesizer (though he also has an old Moog and a much less
common Buchla). He had two Moog synths but sold one. One of the first
things he programmed on the TR-20 was a chaos generator. The "waveform" he
generated looked exactly like this:



Well, without the measurements on the waveform.

Steve H.

On Tue, Feb 20, 2024 at 8:49?PM Ed Breya via groups.io <edbreya=
[email protected]> wrote:

I've been sorting out and organizing old project stuff recently, including
documents and parts and whatever. Every couple years or so, I look online
to see if there's anything new going on in certain areas - usually not. I
ran across this stuff now, which looks entirely new, so I have to report on
it. It looks like there's some renewed interest in the good old analog
computer stuff, including modern designs and applications.

Anyway, here's a link to what I think might invigorate the old analog
stuff a bit. Maybe y'all have seen this before, but it's totally new to me.
I've thought about building an analog computer for decades, but never did
it. I finally started a project for this a few years ago, and it will still
likely never be finished, but it's fun to think about.



Enjoy.

Ed

Okay yep I see it now. #11 Buzz the magnetic latch relays.

Any thoughts on this fault symptom I described? Would really appreciate your insight!

-Frank

I've been sorting out and organizing old project stuff recently, including documents and parts and whatever. Every couple years or so, I look online to see if there's anything new going on in certain areas - usually not. I ran across this stuff now, which looks entirely new, so I have to report on it. It looks like there's some renewed interest in the good old analog computer stuff, including modern designs and applications.

Anyway, here's a link to what I think might invigorate the old analog stuff a bit. Maybe y'all have seen this before, but it's totally new to me. I've thought about building an analog computer for decades, but never did it. I finally started a project for this a few years ago, and it will still likely never be finished, but it's fun to think about.



Enjoy.

Ed

Working my way thru a couple of THS700A models the THS720A and THS730A, has anyone found or possibly made a partial or complete component layout for these units. It seems pretty complex with components on 2 sides of the board. I have the schematics downloaded from TEK Wiki. But sifting thru the component layout I haven't been too successful in figuring out all capacitor and resistors actual locations.

Craig

Mouseover the four small squares in the upper right corner -- "Grid Vew" will appear. Click and you will see all the thumbnails.


c

Google drive has 100s images in the folder, NO thumbnail must DL and view.

Please send me a list with expected prices OR post to list a better format for the photos


Many thanks

Jon

For sale is a very large collection of vintage test equipment, including many Tektronix oscilloscopes, tube testers, CRT Testers, parts, probes from Sencore, Tek, Hickok, RCA, EICO, Triplett, Weston and more. These were all a part of an electrical engineers collection that I am sorting through and I am looking for good homes for them. Please message me or comment if you have any questions or are interested in making a purchase.

If you are looking for any other vintage electronics such as radios, tvs, jukeboxes, record players, computers feel free to ask me for the list, I have an equally large amount.
All items Located in Ontario, Canada. All prices are will be in USD, I am willing to ship to wherever you are as well.

Photos -

It is in the troubleshooting section under start up process.

Eric

Thanks for the reply Eric. I have both part 1 and part 2 of the service manual from Artekmanuals and while it does describe the Start-up/Self-test it several different spots (first time operation, programming section, and theory of operation), nowhere did I see the manual emphasize this step of exercising the relays. But I will take your word for it. Thanks!

-Frank

Barry: These tweaks are an art not a science. After a while you get a "feel" for it.



reposition: move up/down core

Compress: tighten wdg.

May be Iterative with other controls.

Jon

Bonjour cher Monsieur bienvenu a liste Tekscopes.

When working on CRTs, BEWARE of implosion hazard, wear gloves, face shield, eye protection as they my implode at any time.

These CRT are available but shipping is an issue as easy to damage unless packed in original TEK CRT box.

Try Qservice in Greece, who may have it.

Also ask Menachem at Condor Audio in Israel.

Finally we think its easier to just find another scope eg at a Ham Radio marche au puces, as replacement of CRT may need complete recalibration.

Bon chance, amicalement,


Jon

This is called out in the service manual as part of the boot process

Step 1 power on

Step 2 buzz the relays

Eric

Hey y'all! I am still working on this CG5011 with an interesting fault symptom - in 'Volt' mode, it basically AC couples the DC+/DC- frequency mode signals up to ~10V. Then at 10V, it starts displaying a DC signal except it is only ~1VDC. But it will add to that DC signal in the correct voltage increment. For example, changing the div multipler from 1 to 2, the voltage will change from 1VDC to 11VDC. Set div multipler to 3 and it will change to 21V and so on and so forth.

Anyway, I wanted to ask owners of the CG5011 if during start-up does their do what I refer to as the 'relay freakout'. After you power it on, 'Self-test' will appear on the display. Immediately after that, I hear a bunch of relays in quick succession clicking. And then it completes the self-test successfully. My question is, is this normal for the CG5011? Does it always do this? Or should I be using this as a clue. I've already tested every single relay on the A7 board and they all work/tested fine.

I've been documenting my repairs on my YouTube videoblog and I've recorded the start-up many times. If you start this video (linked here ) at 30:32 you can hear the relays during the start-up. Just want to know if this is normal or not.

This is the problem with attempting to repair equipment I've never worked with before. Things like this have the potential to send me down rabbit holes...

Thanks in advance!

-Frank
-Frank

Eggie,

Nice! That set is much better than what I have. I just have some generic small size bit kit I got from Amazon - very cheap. But it does come in handy. I need to get something a bit more quality because a few of the bits just get warped or break.

Just be careful using a torx on a hex drive - it can strip the screw even worse. or damage the bit if you use cheap ones like me lol.

-Frank

See this: and also in my book Tektronix volume 2 you can find several notes on 2465 and similar PSU repair (free on www.k100.biz).

But I agree with Harvey: you should try to investigate what exactly fails and if the inverter runs or what. Remember that the inverter part is with live ground, you need an insulation transformer. And never forget the extra fans if you switch it on outside the box. Another ideas is trying to operate it at lower voltage with a Variac. Remember that the TL594 can be tested also without switching on the main supply, with an external power supply.

Does the unit restart automatically when shut off?

Pretty much any CRT from the 22xx series of scopes will suit your needs.

I can get a parts 2215 for a low cost (I think), but I'm not sure.

I'm not in France though so that is a problem.

I wish you luck!

-Ben