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Found several at Mouser that I don't know which to order The specs look the same and Mouser couldn't tell me the difference CM7152 CM7153AS15 The first one is 30% cheaper.. Thoughts?

2465B s/n 57xxx When I first powered it up, the lights would all come on for a split second, then they would go out, then it would cycle through the self-tests, failing at TEST 05, so I cleaned up the A5 corrosion and replaced a few components there. I also replaced the RIFAs on the power supply. Following that, when I turn it on, the lights all come on, but they don't go out. All J119 points are well within spec. I am a little confused at times when following the service manual, for example the troubleshooting procedure said TP201 should be +10v, but the schematic seems to indicate it should be +5v, which is what I'm getting. I'm not sure how to proceed at this point. I'd like to go as far as possible before I am forced to buy a new oscilloscope to repair this one. Thanks

I recently acquired a TDS3054C that appears to be functional in all regards, except that I've had trouble accessing the built in web-server with modern browsers on my Windows 11 laptop or my Apple silicon (M3 Max) MacBook Pro. I've updated the firmware on the 'scope to v 4.31, the most recent available on the Tektronix website. On the Windows 11 laptop (an i7 Lenovo ideapad) recent versions of the Microsoft 'Edge' browser and the Google 'Chrome' browser simply wouldn't render the display windows served up by 'scope. Same for current Safari or Chrome browsers on my Apple silicon MacBook Pro. As a sanity check, I tried viewing the 'scope pages with Internet Explorer and Chrome browsers running on a virtual Windows XP environment (hosted with VMWare Fusion on an i7 iMac). With that setup, I could view static screen-shots of the 'scope display, and the 'scope status window. Also, I could download and upload waveform data. However, I found that the tek.com 'cgi-bin/connect' service doesn't appear to be available. After confirming that the 'scope was actually serving screen-shots and waveform data, I started looking for other 'legacy' browsers that would let me access the 'scope from the Windows 11 laptop. I found that the mypal browser (https://www.mypal-browser.org) did the trick. For accessing the 'scope from my Apple silicon MacBook Pro, the Firefox browser v129.0.2 does a great job. Now, if there was just some way to download the cgi-bin/connect scripts from www.tek.com, or the tek 'escope' site was working, I'd be a happy camper. Mark

There has been some discussion over the years as to how to disassemble the knobs for repair/cleaning. I got mine fully apart (thanks to the photos others uploaded when they got stuck) and uploaded photos. For knobs designed like mine, the black cap pops off and there is a screw underneath. Until the screw is removed, the smaller knob cannot be separated from the larger. The clipped off leads on the LED package allow testing each LED individually if desired; mine have a Vf of ~1.5v. Alternately, 7.5v across the array results in them just starting to glow. The center pin on the left of the array (as oriented in close-up) is common. It seems the transistor on the lower left pin in the array is bad, as it doesn't respond to light; the others do. Does anyone know where to find a 1x5 phototransistor array with spacing of ~1.175mm c-c? The schematics don't show much beyond the fact that the array is biased with +/-15V, and nothing shown in the opto section of the 1982 common design parts catalog looks even remotely close. Regards Mark

mark999 <mpictor@...> added the photo album Tek 7L5 resolution & frequency knob disassembly ( /g/TekScopes/album?id=301996 ) : 7L5 knob encoder disassembly

Greetings! I need to re-letter the skirts for some of my scope knobs. Has anyone done that here? I am thinking that black vinyl reversed letters on transfer stock would work. I found a few sites that provide that service, but I am not sure if they can deal with the small size that would be required. Not sure if a design tool is available online. Other suggestions are welcomed! Thanks, Barry

Greetings from Louisiana! I have had several damaged shipments of the SC502, SC503, SC504 scopes. The Slope / Level switch-pot is damaged along with the knob. In a similar way the Volts/Div and Time/Div knobs were broken. In one case the shafts on all 3 knobs were broken. I decided to have shafts built in plastic and 316L Stainless steel. I took the original knob with the printed skirts and drilled out the original shaft and replace with the custom shafts I designed and had manufactured. The plastic shafts are as good as the original, and the 316L stainless steel shafts are far better than the original. I am also working on having the skirts manufactured out of 1/16" acrylic and printed with UV Ink. So now for the question(s)... 1) Does anyone have any SC502, SC503, SC504 knobs with broken shafts that need to be repaired. I can provide the shafts or repair your broken shaft. 2) Does anyone need new skirts for SC502, SC503, SC504. So far I have restored several of these scopes (more than 10). Initially I got plenty of help / suggestions from the group. Many thanks for that. Regards, Barry

My ancient Tektronix 547 oscilloscope with 1A1 plugin was working fine until a few weeks ago when the display suddenly went intermittent and bright, and an arcing sound came from the area of the crt high voltage circuit. No arcing could be seen anywhere, but the sound definitely came from the vicinity of the high voltage assembly. At this point, the Intensity control had no effect, and the intermittent sweeps were very bright. The sweeps only occurred when the arcing sounds were heard. Otherwise, a bright spot stayed on the left side of the display. The focus control also had only a slight effect. Suspecting the flyback transformer T801, I sourced an assembly from another 547 that included the transformer and the voltage multiplier comprised of the 5642 diodes. Symptoms remained the same, unfortunately. Replacing one of the regulator tubes in the 350V supply (6CW5) with a brand new one strangely made the arcing go away, but still no display. In fact, no more intermittent sweeps, only the ultra bright spot at the left hand side of the display. Currently, I have no way of measuring the high voltages from this assembly (10kV), so I’m not sure if they’re within spec. I also changed out the four 0.01uF caps in the Intensity circuit in case they were arcing, but no improvement. Scoping the output of the B Sweep Generator section (at tube V91), there was no sign of a sweep waveform (consistent with the stationary bright dot on the left side of the display). I’ve tested every tube in the scope, except for the 6080s (and checked all transistors for opens or shorts). None gave the impression that they would be show stoppers. I also scoped all B+ and B- rails. All were rock steady except for the +350V line, which had some ripple. Even after changing out the 6CW5, the ripple was still there. It’s obviously generating high voltage as evidenced by the bright spot on the crt. I can’t understand the relationship between the inability to control Intensity and Focus and the lack of a sweep signal. It doesn’t matter whether I’m in A, B or ALT timebases. Could the crt have an internal fault? Any advice or best guesses as to where I should look next would be much appreciated. Thanks in advance.

have a trio of Tek 453's. Two are MOD 703K and the other is MOD 703H. I have had one of the 703K's on my bench for many years. Of late, it has developed trigger issues. I can only get a stable waveform if feed it a square wave. It will not trigger on a sine wave. The other 703K triggers fine, but has a few other issues, chief among them it is missing the center control knob for the sweep control. Not just the knob, but the center shaft. Not clear what is actually missing internally since that control is fairly well buried (as is everything else on these). The 703H has many other issues, stability wise, so it may become a donor for missing knobs/controls, feet etc. Thoughts on the trigger issue?

Hi Group Members! Got a broken TM5006 Mainframe and found a few damaged parts showing a short on my Multimeter. Here the original part #, and now I’m looking for x-Types for those parts. I’d be nice if someone could give me a hint or confirm about the parts I found are fitting! 151-0632-00 some people use MJE13007, or some the MJE13009? 152-0655-00 A115AX39 ??? Can not find this type of rectifiers at all… 152-0400-00 1N4936 152-0686-00 MR821 Any help welcome! Best, Joe

I've got an SG503 on my bench that seems to be working fine on all ranges with nice leveled output, etc. However, the finger contacts under the cam switch need to be cleaned as I have to fiddle with the switch a bit to make contact at some settings. It is my understanding that the best way to clean the finger contacts is to get a piece of paper/cardstock with a bit a 99% isopropyl under the contacts and gently pull it across the contacts. For those who have done this before, my question is what is the best approach to do this with a SG503? Is there a way to do this without a major disassembly? I'm not adverse to disassembling the module but I don't wan't to overcomplicate things if I don't have to. Thanks! Jay

Hi folks. I recently purchased a Tek 2247A scope and upon testing it for the first time, it locked up when testing the B sweep with a msg that said 'INVALID INTERRUPT FROM 0993:F082' When I rebooted, the screen has an indecipherable error message that appears to read something along the lines of 'Part Number 100-xxxx-00' with a bunch of exclamation marks. I couldn't clearly read what the part number as it was out of focus and could get it to focus well enough to read the numbers. The 'Auto Level' and 'Auto' LEDs were flashing which indicates both a RAM and ROM problem according to the service manual. The SGL SEQ LED was also flashing but there's nothing in the service manual that mentions that LED, or at least nothing that I've found. I let the scope sit for 10 minutes and it booted back up in service mode and gave a failed battery warning, and ran through self calibration. I left the unit on and it locked up after about 10 minutes with the same error as before. After the reboot I went into the service menu and ran the self test 'until fail' and the test ran for 30 minutes without issue. I also ran through the self calibration once more. It's now been powered on for a few hours without any problems or locking up and all functions 'seem' to be working as expected. Thoughts? Would something like this be caused by a battery issue? That seems like an easy fix but if it's something deeper, I'm not sure if I'd want to chance it. Thanks! Jay

Hi. I've got a faulty MSO4104 here (not the B version) and it has a bit of a history. Someone at work blew up channel 1 on the 1Meg input many years ago but the scope was still useful on the other three channels (and on 50R input on channel 1). So it has been in use like this for several years. However, someone at work recently upgraded the firmware on it to V2.68 and this caused it to report a failed SPC self calibration. So it halted the SPC after a few seconds. This left the scope in a bit of a mess with lots of sampling artefacts on the traces and some trace distortion on all four channels. So it became fairly useless. I've had a look at channel 1 and restored normal operation on the 1 Meg input (a resistor was blown open circuit) and so I was hoping that it would now pass the SPC. However, it still fails although it gets a lot further into the SPC before failing. I think it might be failing on channel 3. Does anyone know what the format is for the error log file? It gives a date and some words and numbers on each line. I think there may be an issue with channel 3. I also have my own MSO4104 here to compare against. It is running V2.68 FW but it is a newer instrument. Is it possible to go backwards with the firmware to an earlier version of FW? Any other suggestions to get any meaningful debug info from it during the SPC process? Can it be logged remotely whilst doing it? I've looked through the user and service manuals for stuff about the error log but can't find anything.

no personal connection https://sacramento.craigslist.org/ele/d/sacramento-tektronix-2445b-oscilloscope/7843398888.html

Hi, I have a Tektronix MDO3024 scope. Working great ! I would like to have on the screen the analog CH1 screen and the RF signal. Is it possible on the MDO 3000 series or it is only with the MDO 4000 series ? Thank you Matthieu

Hi all, I have a Tek 2432 which fails the following; 1: 7000 CCD 2: 8000 PA 3: 9000 TRIGS I also have a Tek 2432A which fails; 1: 5000 WP 2: 8000 PA -- no pass/fail message 3: 9000 TRIGS -- no pass/fail message Is this an almighty going round in circles job or has anyone been through this before? Before you suggest it - the batteries are ok. I may donate these if they require a lot of time to fix to somebody who has the time. Regards Gearoid Loughnane Dublin

I recently bought a 3B3 via ebay, that I got cheap because it had been damaged. The only obvious damage was that one of the long, round, chrome plated chassis rods was badly bent. I thought I had some good, salvaged, 3-series rods so I figured this might be an easy fix. First surprise: I don't find any chassis rods in my stash of Tek spares. I managed to straighten this one. It's not bad, but if someone has a good one they'd like to part with, I'll pay a reasonable price for one. Note that the 3-series chassis spacing rods are ~12-3/16" long, longer than the 1 or Letter series rods. This is a late rod, with the crimped hex at one end. Second surprise: One of the 6DJ8s has the getter turned completely white. It had been knocked sideways by whatever had bent the rod, so I figured there must be a crack around one of the base pins, which had been bent. No such cracks appeared, but I finally noticed that the pinch tip at the top of the tube had been completely broken off. Sad, but at least I have a few spare 6DJ8s. However, this dead 6DJ8 is unusual. There is no etched ID anywhere. In typical red ink, it says NATIONAL, with the National logo, then the Tek part number, 157-0125-00, then MADE IN JAPAN. Oddly, 6DJ8 does not appear anywhere. The 157-0125-00 is an aged and selected version of the 6DJ8. So, with the Tek part number inked onto the glass envelop, the ageing and selecting must have been done in Japan, by the original manufacturer. Or perhaps they were able to control their production carefully enough to make the ageing and selecting unnecessary. I'd love to know how this was done. Or maybe this was done so late in Tek history that no one cared. There are some additional numbers in red ink on the tube: 51A, 83781, and 8729. The last one might be a date code. So, at some point in time (1987?) Tek contracted with Richardson Electronics, in the Chicago area, to make 157-0125-00s (6DJ8s) for them, with the National label on them. Then Richardson turned around and subcontracted them to Japan (Toshiba, Matsushita, Hitachi?) to make the actual tube. I have to assume that this was all done with Tek's approval, but it still seems odd, especially with no 6DJ8 marking. This was probably a very nice tube, and probably still is, except for being full of air and the consequently blown getter. Have you ever seen a National, or any other brand, tube with the 9 digit Tek part number printed right on it? -- Jim Adney Madison, WI USA

Dear tektronix fans To introduce myself Hubert ON6JZ living in Belgium and an electronics repairer for 45 years I now have a tektronix 2712 on the table that does not work. It has been idle for over a year. At startup it gave all kinds of error messages , after replacing both batteries on the digital board and on the digital option board it seems to start up normally , but I get no response from any button and the encoder does nothing either All supply voltages are correct and viewed cleanly with a scope I replaced all the smd electrolytics on the sweep board and on the digital storage board No result On the screen I get an image of out of memory. Does anyone have any tips on where I can look for this error? Thanks in advance Hubert

CHECKSUM I would kindly like to know, assuming I dumped correctly the CAL 02 values, if there is a sound method to verify the checksum for my scope before fiddling with the battery. Any pointer before I get mad with X-Way forensics editor? I found a guy that could re calibrate it for 300EUR (maybe 250, we have two scopes) so I could just avoid the hassle to change the battery myself and/or switch to FRAM. It seems it could even be a reasonable price, I don't know. RECAPPING Of course, if I have someone to recalibrate it, I may well think of recalibrating it AFTER recapping. Is there any current BOM for Digikey/Mouser available? TIA. -- Giuseppe Marullo IW2JWW - JN45RQ

New eBay link: https://www.ebay.com/itm/116555806260 -Thomas