Re: Collection of Tektronix Oscilloscopes, Plug-ins and more
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
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Collection of Tektronix Oscilloscopes, Plug-ins and more
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 -
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Re: CG5011 Self Test Start-Up - Relay Freakout
It is in the troubleshooting section under start up process.
Eric
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On Tue, Feb 20, 2024, 10:37 AM Frank Mashockie <fmashockie@...> wrote: 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
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Re: CG5011 Self Test Start-Up - Relay Freakout
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
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Re: 7704A - Auto-Focus Calibration Question
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
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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
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Re: CG5011 Self Test Start-Up - Relay Freakout
This is called out in the service manual as part of the boot process
Step 1 power on
Step 2 buzz the relays
Eric
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On Tue, Feb 20, 2024, 8:43 AM Frank Mashockie <fmashockie@...> wrote: 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
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CG5011 Self Test Start-Up - Relay Freakout
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
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Re: Which Torx Size must I buy to refurberish someTM5000 Series Relais
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
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Re: Tek 2465 power supply cycling
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?
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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
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Re: Which Torx Size must I buy to refurberish someTM5000 Series Relais
Hi Frank,
I bought then a Wiha PicoFfinisch 267P Set (T4-T9). Excellent Set. By the way Torx Drivers also fit Allen/Hex Setscrews in a superior way. Very handy when you must use force in releasing Setscrews of the Knobs on your Scope.
Egge Siert
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I inherited a Tek 453. It was very dirty. When I press the beam find button I can get a momentary dim spot near the center of the CRT, but only a flash. What should I look at?
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Re: 7704A - Auto-Focus Calibration Question
There's another degree of freedom to worry about, which is the relative position of the clump of windings along the body of the part - in one direction or the other, depending on which end can be considered "common" or "hot." For adjustment of mostly a capacitive effect, maybe you can ignore inductance like the winding pitch (spacing) and diameter (tightness to the part). So, I'd think the instructions are about locating the arbitrarily more dense (tighter spacing) portions of the winding toward one end or the other.
Or not.
Ed
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7704A - Auto-Focus Calibration Question
The calibration procedures in the 7704A manuals for Z-AXIS AND DISPLAY, section 8, "Adjust Auto-Focus Operation", describes how to adjust the gimmick capacitor which is a coiled wire around R41131.
In one manual (REV NOV 1985 shown at the bottom of page 4-9) it states to "compress" the gimmick wire to adjust it.
In another manual (REV. B, MAY, 1976 shown at the bottom of page 4-8), it states to "reposition" the gimmick capacitor.
I'm unsure how to adjust that capacitor. "Compress" might mean to make the coil hug the body of that resistor more tightly but "repositioning" it could mean to make the coils be closer together (i.e. make the coil effectively shorter). Possibly both "compress" and "reposition" are meant to do the same thing(?).
Furthermore, step "f" in the REV NOV 1985 version states to adjust the gimmick capacitor where "the rising edge of the waveform is completely squared off" but step "e" states to set the test scope for a negative trigger slope and a sweep speed of 50ns/DIV so a rising edge wouldn't be seen there (at least I don't think it would be).
Anyone have any wise words of guidance for this? It seems just a bit confusing to me.
Thanks,
Barry - N4BUQ
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Tek 310 (not A) subject to divestment...
Hi all,
It's been a long time since I have been on the list, but I've been going through some things and getting ready to go through some more (this time another knee replacement).
I have a Tek 310 oscilloscope that I thought I had the time and energy to rebuild, but it was not in the cards. I removed the Selenium rectifiers and then got stalled. I have a replacement CRT and an age appropriate probe, to go with.
Is there anyone who would come pick this thing up in Port Townsend WA? If not, I will package and ship if you will pay the shipping expense. I will do my best to catch the first one with a credible response, but no promises and no hard feelings, ok?
Email me at p (dot) potter (at) sbcglobal (dot) net
Text me at (559) 977 5856 and start with "TEK 310" so I don't simply delete... you know how annoying texts can be.
or, as a last resort try me here. I turned on individual replies, so that should work.
As an inducement to come here, I have some test gear I would re-home to you; including HP GHz counter*, meters, bench power supply, audio generator, Fluke bench meters, a classic Heathkit Capacitor checker, MORE... all used, some dusty, some repaired and working well, *some not.
Please contact me, so that we can plan your field trip to wonderful Port Townsend WA!
Best,
Phil Potter
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Re: 465B For Sale in Philly
Hi Ted,
How are you? Is this still available? I am located in California but I
would love to have this. I am also originally from Pennsylvania. I grew up
in Chester Springs. Is it possible to get this? My number is 626-733-3911.
Thank you very much.
Thomas Dodge tdodge2404@...
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On Mon, Feb 19, 2024 at 4:30?PM Ted Snieckus <tsnieck@...> wrote: I have a 465B for sale in Philly, only doing a local sale as it does not
work properly. It powers on but the trace is distorted and only on the left
side of the display. Happy to answer any questions anyone may have.
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I have a 465B for sale in Philly, only doing a local sale as it does not work properly. It powers on but the trace is distorted and only on the left side of the display. Happy to answer any questions anyone may have.
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Re: Tek 2465 power supply cycling
Are you familiar with the (typical) tantalum capacitor problem in tek equipment of that age?? The manufacturer said that the parts were good working too close to their voltage limit.? i.e. a 6.3 volt part would be fine on a 5 volt rail.
The typical parts that seem to fail are on +/- 15 volt rails. The parts failing can be either on boards or in the supply itself.? If the supply will run without an external load, then check the voltages without the rest of the scope.? If not, you may want to look at building a dummy load.? The service manual may have a section on troubleshooting the power supply.
If possible, you can look at the supply voltages and see what happens when it fails?? 15 volts low?
It's possible that you may be able to figure out what parts on the A20 board (may be suspicious) connect to the 15 volt rail and check them.
If heat fixes it, you might try freeze spray.? It may or may not be a capacitor.
Harvey
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On 2/19/2024 12:05 PM, peter bunge wrote: It is nearly impossible to troubleshoot this power supply.
I can see why people shotgun replace all caps.
I cannot find any reference in this forum on a fault being traced to a specific capacitor.
I see a mention of capacitors on the + and - 15 v supplies but that is a bit vague for me to locate.
I will try to find the EEVBLOG 2465 Teardown with a search.
My test shows the scope works 10 seconds after a few seconds blast of hot air in the middle rectangular hole beside the connector to the A20 buffer board connector that plugs into the power supply. Then it works indefinitely. Without that it takes many minutes to start working.
Funny that it come on working in 15 seconds, works for 40 seconds then fails for many minutes before working indefinitely. The heat just speeds up the recovery.
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Re: Tek 2465 power supply cycling
Thanks Raymond and Renee.
I found the EEVBLOG 2465 Teardown but it just has pictures like I have been taking.
I cannot find a reference to a specific capacitor that has failed. With the difficulty of replacing one I can see why.
I don't see anyone running the power supply out of the 'scope either.
I don't see any damaged components or bad solder joints on my boards.
There is a 10 second lag between applying a few seconds of hot air and the recovery. It seems too short to be heating a capacitor.
Tapping the boards has no effect but I will try to get an insulated rod into the tight spaces.
Prying the boards or removing the PS several times should change the symptoms but it has not.
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Jean-Paul
Frank Mashockie
Benjamin Badrakh
Thomas Dodge