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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. 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

Hello, I have scanned some Tektronix Television Products related material, including: Tektronix TSG7 Instruction Manual Tektronix SPG1 SPG2 Instruction Manual (has information regarding the SPG2A update) Tektronix 1480-series Waveform Monitor Instruction Manual (with schematics) Tektronix Television Products Catalog 1980 They can currently be found on my Internet Archive account ( https://archive.org/details/@sevarre ) . I will see about getting them up on the tekwiki. Also I am curious if anyone has any manuals or materials for TSG7 "Opt AB" (manual 070-4908-00) and SPG2A "Opt AA" (manual 070-4905-00). I am able to find descriptions of them in other service literature, but no manuals for themselves. Nice to see the 1485 "Mod W5F" is on the tekwiki! I have a big binder of Tektronix TV Products from 1976 that I will try and scan and upload soon, too. -Michael Bierlein

Hi to all usual suspects here. You will maybe remember you helped me resurect my 7704A from decades of non working neglect. Thanks! Here is for me a new challenge. I did a large leap in time from the 7704A and just bought a TDS520. At boot: All ok except: FAIL++Acquisition FAIL++ Attn/Acq interface As soon as I knew it will be coming I read here all I could about it so I know that Artek has the documents. Btw I want to praise Artek a bit here. I bought them the service manual for my two HP8640B I just bought too (yes, two is gluttony, I know but they were cheap and defective of course, so how to resist?) Anyway Artek gives a really good service. The manuals are of upmost quality. I got them instantly and the charge is very reasonable. I posted the boot to "TDS520 in Brittany" /g/TekScopes/album?id=291619 Also the 1993 rom: A11U1331 ver 1.5 There's a 7 segments inside at the back which only blinks alternately his two right segments. Apart for the fails the scope is in perfect shape and was only very dusty inside. I disinserted all flat cables I could find and re-inserted them. I also removed the dust with hope this will change the fail boot (not really!) It did not. All advices will be received gratefully.

Hey all, So, based on some exchanges in the thread about the Dennis Tillman PCB for the 577/677 build, I am definitely on my way (parts are coming). But I wanted to start a new topic on the 577 itself to get some advice. This is a 577 that's in very nice condition and when I bought it in 2020, it was sitting in the seller's garage with a trace on the screen. I realize that doesn't mean a whole lot. But here we are 5 years later and, at some point, I'm going to have to bring her back to life. So, I'm looking input on next steps. For example, should I warm it up slowly (and over what period of time) with my variac, etc. Or maybe do some diagnostics on the power supply before plugging into mains. And so on. I have a variety of test adapters but, given the power up sequence suggested in my operator's manual, the one that I don't have that I apparently need is the axial diode adapter https://w140.com/tekwiki/wiki/013-0111-00 Thanks in advance for any replies. David

The Tektronix 155-0124-00 is a hard part to find. I was able to repair my 2235 scope with an alternate part. I used a Tektronix 234-1008-20 which was made by Maxim for Tektronix. The Military version of the 2235 was the AN/USM488. The Military National Stock Number (NSN) for this part was 5962-01-062-7562, which is also the 234-1008-20. I located this part on eBay, replaced it, and got my 2235 operational again.

I scored a TM503 with a TG501 and SG503 and would love to add a 506A to have nice calibration set. Send me a message and let me know! Thx. I'm in NJ.

I was working on 2230 which has power supply failure. Changing the main bridge rectifiers CR901... CR904, Q9070 and Cr907 restored the power supply. The scope power ons with an issue CDT issue CDT value changes from 73 to 77 during different sessions of power on. After pushing the one of the menu scrolling key CDT goes off. I have following display issue: 1. No trace 2. Readout tex for volt/div and sec/div display. 3. Intensity and focus works 4. Sec/div switch in A mod doesn't work. I can see only 50m 5ns and. 2s changing the position of switch. 5. Horizontal position switch works but only for half portion of the screen. What I did so far. 1 since there is no trace just a dot I started to Look for horizontal section. 2 looked for ramp signal at waveform 24 and 29 but I could not see any just a dc offset. 3 decided to clean the sec/div switch so according to the instruction I pulled out A4 board which contains sec/div switch. In the A4 boaed I found strange connection. Collectors of q742 and q732 are tied together and connected to A sweep input of U760 while B sweep input is left floating. I will be thankful if some one in this forum suggest on this issue and guide me to resolve the issue of my scope. Thanks Saroj

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

I am working on a Tektronix 2467 oscilloscope and need to know if I need to put new 3.7 volt battery in this oscilloscope when to battery reads 3.7 volts.

Hi, Anyone rewinding these? My 561 lost its beam... Thanks

I have two 310A 'scopes that were, if infrequently used, behaving pretty well until, quite suddenly, the one made in around 1963 (S/N 019006) had lost its -150 supply, which incapacitated it. Ultimately, it proved to be the 204 volt winding of T600 (120-118) that faltering yet was working again yesterday. Today, out of curiosity, I turned on the other, older 310A and had the same problem, which disappeared when I next turned it on. Also, once both 'scopes were operational, the three supplies were -150, 100.5, and 300.9/-151.6, 100.x, and 300.x - very much within tolerance. (On the first 310A, I did disconnect the -150 supply from the transformer and found that the voltage on the transformer secondary had dropped from the expected 204 VAC to around 70. Resistance readings between legs were well over a meg Ohm and were over 4 meg Ohm from either leg to chassis. Later, when the transformer produced 204 VAC, I reattached the -150 supply leads and had a functioning scope again.) Have other 310A owners had similar difficulties? I found no mention of this problem on either of the Tekscope groups. It also, at least initially, made me want to take the bell off the 'top' of the transformer to look for signs of arcing, but it would require a lot of work with the potential of only confirming a dying transformer. Still, if others have encountered this problem and fixed it with something like fish paper stuffed under that transformer bell, or 'top,' I am willing to give it a try. Both 'scopes have been stored in a climate controlled basement with humidity never reaching more than 40%. Both 'scopes were partly to substantially rebuilt in 2019 and 2020, including the replacement of all electrolytic and film capacitors. Both were working fine just last week, too, although the younger of the two did have a noticeable hum from the transformer, but it had always had that.