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Hi, Anyone know someone who can rewind HV transformers? Lost my beams on my 561. Thanks

Hi all, I got this scope in non-working condition due to failures of the A10 module (acquisition board). First time I turned it on, it ran and failed its startup tests. Since then, though, it'd start successfully and only fail full tests if ran deliberately (of course) - I think this is because this has been sitting for a long time and I gave it a bit of a run and that's been baking for it and reforming caps and so on, so a good thing. Always, the failure is apparently associated with the acquisition board. I don't recall if the forum allows image attachments to emails, but if it does, I'll send some logs and reports shortly. The failure seems to be associated with different ICs on this board every time I run them. Not sure if that can be interpreted conducively in any way. Thank you for your input in advance! Radu.

I sent this the other day to the other TekScopes list but thought I would try here too for more ideas. I was given a 2245 recently which of course doesn't work too well. Investigation reveals that Q805 and Q806, in the horizontal right plate output stage, are cold to the touch. The service manual, section 6.2 (page 6-19) says, The MOSFET output transistors (Q801 and Q802 left plate-- Q805 and Q806 right plate) run hot. If either side is cold, it is defective. So, that's me and now I need to find a couple of these VDMOS FETs, which seem to have become quite rare. They are Tek P/N, 151-1211 VN1316N2 N-Channel VDMOS FET, 160V, 250mA, 40 ohm 151-1212 VP0116N2 P-Channel VDMOS FET, 160V, 250mA, 25 ohm Has anyone solved this problem with a modern replacement pair? and have suggested substitutes? These are in TO-39 package which adds additional challenge but I suppose TO-220 or equiv could be made to fit. Of course, the real thing would be great too if there is a source. Thanks for any leads! Chris -- Chris Elmquist

I am still cleaning up and ran across a 1980 Tektronix Catalog, a 1981 Tektronix Catalog, a 1980 HP Catalog, and a 1981 HP Catalog. All are hard covers. The are free if you pay the shipping costs although I would gladly accept and appreciate donations!

Hello again Have a working Tek SA 492, SN B05 1984 , 2500 hrs. to check power supply for RIFA caps, lytic and tants, the. PSU remove procedure in manual is vague on the location of connectors before you pull it. Any tips or diagrams ? caps to replace or change ? Your thoughts and advice appreciated Many thanks Jon

It occurs to me that, if I am going to unbind my 7934 manual (re-binding is a pain) to scan pages 6-22 and 6-23 in order to update the copy on TekWiki, it would be useful to know if there are any other pages missing from the online copy. This would require someone to go through the online manual page-by-page to verify that those two pages are the only ones missing. I don't have time to do that right now. If someone is willing to do that, please let me know ASAP. DaveD KC0WJN

Due to a mistake on a drawing Tektronix had 012-0482-00/01 cables made with RG-58/U cable. They have now corrected the error and have the 012-0482-00/01 made with RG-223/U cable. -- Jeffeelcr

Hi all, I'm one more of those people who can't pass by when they see the shape and colors of something Tektronix. Now I'm working on a 2467B and while it seems to be working well, there was one thing I wanted to resolve before finishing my calibration efforts. It's a late model I think; some date codes are from 1995, the serial is B053790. I started measuring the test waveforms from the service manual (070- 6863-01) in the trigger, sweep, horizontal amp and Z-amp sections (reson below). What I am confused about is that several sweep gate and sweep waveforms initially look okay on my scope but I don't see the same levels. And looking at the schematics, the test waveforms don't make sense to me. Waveform 31, for example, is supposed to reach -0.2V. But I assume U700 outputs 0V or 3V on the SG# pin, and Q745 cannot pull it lower than GND. What does? CTO by charging the "** part of ECB" capacitor?! I normally work in the digital domain and I always struggle with these analog things. For the B trigger, waveform 38 is easy, it's just 0V or 3V on SG#. But then waveform 39 follows and quite unexpectedly drops down to - 0.5V. Again, the PNP transistor doesn't seem to explain that. These A and B "sweep gate not" signals are interconnected and also enter U985 and U975 (the "measurement PAL"). The latter seems to get pretty warm, but I see no obvious malfunction. I read the circuit description on page 3a-21 of the manual but it did not give me an answer. So any help making sense of these waveforms is greatly appreciated! As for the reason for looking into this, I had some difficulties doing the "high drive focus" and "writing rate threshold" adjustments on page 5-6 of the manual. Triggering seemed unstable, although this might be normal (the manual talks about a "flashing sinewave"). Later I noticed that at fast sweep times, something like 2 DIV of the trace seemed to be missing between the triggering edge and the start of the trace on the display. An explaination was given on the other list [1] about how this is expected behavior due to propagation delay in digital logic and I can actually see the triggering edge, thanks to the delay line. I'm attaching some screenshots/pages from the manual for the reader's convenience (or at least I'm trying). - Michael [1] /g/TekScopes/topic/11350057

Wondering if anyone who has a "spares" 465, 475, or 485 would be willing to pull a couple of the LEMO power jacks from the back (the four pin jackused to power Tek probes that use +/-15VDC) for me. I want to build a stand alone power supply so I can use some of my power-required probes on my 2465B, which aren't equipped with them. email is K7WXWatqrpdxdotnet or message me here. Thanks! Bill

Hi I recently acquired 2465B. At power on the self test passes with no trace. Short description about the scope: It has serial no b065557 It has smd in A5 board. After searching in the net I came across a point that adjusting grid bias trace can be made visible. Accordingly I got the trace with following issues : Intensity control has no effect. Focus control has effect. Read out intensity has effect Scale illumination works CH1 and CH2 vertical position can be changed within only one division mark while CH3 and CH4 vertical position can be changed from lower to upper side. Screen frame is shifted 1division Below. And one more thing in the first quarter of the screen there is a message: A1 - 02 v? This number changes according to the position of CH1 volt/div switch I have the service manual downloaded. I have been going through manual for last few days. If some body has idea where where to look for the fault. By the way I wsa able to fix my 2230 5 years back using this group. Thank Leo once again your patience and support.

In my collection of probes, I have a P6610 physical measurement amplifier and three P6610 pressure transducers. I don't have any documentation and a search of the usual sources has come up empty. Wondering if anyone here knows anything about this probe or, better yet, has some documentation they would be willing to share. Thanks - Bill

While cleaning out a storage building, I uncovered two Tektronix Instruction manuals. One is for the 515/515A scope and the other for the RM529 scope. If anyone would like either, you may have them free (of course a donation would not be turned down) plus shipping charges. Please let me know soon if interested.

Hi, My 7904 HV transformer in the PSU is giving trouble. There has been corona type discharge from LV secondary windings and on taking it out the transformer paper is burnt away in places. I guess it needs replacing / rewinding. I've rewound simple transformers with E-I laminations /motors / voice coilds before using a Heath robinson contrivance on an old plain lathe. But this one does not look simple and I found it hard to get elephantide type transformer paper in small quantities (not whole rolls weighing tons). Does anyone have any pointers / suggestions starting with really basic stuff like how to dismantle the core without damage? Alan Bain

Posted this in other Tek scope group, did not want to leave y'all out! Note to group, my 2465B scope had cracked rear tan plastic cover. JB Weld "Plastic Bonder" tan color is a 2 part polyurethane adhesive with a great color match and adhesion. Should work other models I would think. I uploaded photo to Photos folder here: /g/TekScopes/album?id=300551

These are equipment accessories for which I no longer have the original test equipment, mostly from Tektronix, with a few from HP or Aglient. Some notes: 1. accessories with the notation "NOS" are unused, still in their original packages, including their probe leads and so on. 2. accessories with the notation "working" have been tested for basic functionality on a 350MHz oscilloscope. 3. accessories without the notation "working" are sold as-is because I don't have a way to currently test them. 4. oscilloscope probes do not come with grounds, probe clips, or other add-ons unless explicitly noted. 5. accessories are all in good mechanical condition. the older stuff has the usual knicks and scratches. 6. prices do not include shipping costs, which I will add to the purchasse price when I have your address. 7. accessories are grouped, with a price for the lot given. Sorry but I am not interested in breaking the lots up. 8. acceptable payment methods are Zelle, check, USPS money order, and (reluctantly) Paypal family and friends. Checks and money orders must clear before shipping. 9. buy two groups and take a ten percent discount 10. buy it all and take a twenty percent discount Shipping will be from Portland, Oregon and limited to domestic buyers. Given the current turmoil in the United States, customs and overseas shipping is a non-starter for now. My contact information is on QRZ.com under my amateur radio call sign, K7WXW: https://www.qrz.com/db/k7wxw Thanks, Bill TEKTRONIX ACCESSORIES price for group: 80 (4) 012-0747-00 and 020-720-00 logic analyzer probe test lead set (NOS) - in original bags with probe adapters, grounds, probe clip (1) 012-0747-00 logic analyzer probe test lead set (1) 020-720-00 probe adapters (NOS) - in original bags price for group: shipping (6) 015-0580-00 pocket signal generator price for group: 50 (1) 012-1372-00 tekprobe interface cable price for group: 50 (1) S-3A sampling head (SN B041187) (2) 012-0130-00 sampling head interface cable price for group: 200 (1) 013-0098-01 transistor curve tracer fixture (3) 013-0124-00 integrated circuit curve tracer fixture (2) 013-0101-00 TO-66 curve tracer fixture price for group: 100 (1) 067-0608-00 overdrive recovery calibration fixture (1) 067-1341-00 risetime limiter (1) 067-0554-00 tunnel diode pulser (1) 067-0562-00 P6046 input adapter (1) 067-0538-00 input RC normalizer (2) 011-0081-00 termination/feedthrough (1) 067-0569-00 sweep attenuator (1) 015-0168-00 displacement transducer (1) 067-0969-00 tape head alignment module price for group: 200 (5) P6122 100MHz probe (working) (2) P6105A 100Mhz probe (working) (2) P6062B 100MHz probe (working) (1) P6109B 100HMz probe, NOS (working) price for group: 180 (4) P6109 150MHz probe, one NOS (working) (2) P6053B 200MHz probe (working) (3) P6106 250MHz probe (working) price for group: 225 (2) P6135A 150MHz differential probe (working, black tip, with ground cable) price for group: 160 (2) P6134 300MHz probe (working) (2) P6134 300MHz probe (working, no probe tip) price for group: 60 (3) 119-1164-00 bias return HP AND AGILENT ACCESSORIES price for group: shipping (1) HP 8495H attenuator (sma, programmable) price for group: shipping (1) Agilent 16752A logic probe cable set (4 pods) price for group: shipping 54003A(2) HP 54003A probe pods

Hi All: a bit off topic, but saw some mention of display of distortion components by John-Paul (in thread about tube scope probes). This was done at Marsntz, and Sequerra back in the day by their analog guy. In the HP 334 manual, there are tantalizing mentions of this ability, and a diagram showing distortion products from a CRT I suspect. However, there is no hookup diagram, nor instructions on how to accomplish this display feat. Hoping someone has information to connect the proverbial dots here. Thanks in advance! Randy Tek 555, 7834, 7633,7623, HP, Fluke, and others.

Greetings all and Merry Christmas. I have a Tektronix 1503C TDR, the one with the EL display. It works fine except that the display is very dim, dimmer than normal. My question is, has anyone here ever had experience replacing the illuminating portion of the display. I don't want to experiment with my unit fearing I could make it worse by destroying the display altogether. Any thoughts would be appreciated. Burt, K6OQK

Bonjour, we recieved a fine TEK 492 SA, circa 1980s..1990s, fine condition CAL in 2007. SN B055xxxx Will post photo album. Q: Do these have the notorius SMD lytics on some PCB that leak and corrode ? Which PCBs are suseptible? WTB: For nonprofit museum , restoration to original condition: Original TEK front cover small knob (intnesity, etc) complete service manual (2 vol, binders) original printed version MANY THANKS !! Have an absolutely fantastic day! Jon

I have a new microscope; It needs shelf space in my study. I also have an old Tektronix 485 in excellent condition. I have not used it in a number of years; replaced its usage with a 2465B and a RTB2004. I’m getting old (nearly 80) and will probably will not go back to using it. It needs and I hope it gets a good and appreciating owner i.e. a new home. I loved it. Clean and sharp display on both channels. I have both of the original probes (with manuals). I also have the cover and handle and probe pouch. The pouch and handle were removed to place it on the shelf - the shelf I want to keep the Scope on. Both handle and pouch are in my study and I would need to find them. I would like $500 + packaging and shipping. I live in Maine; the scope is heavy but exorbitantly so. I would rather sell it here (either Tekscpes or Tekscopes2) and not ebay or whatever. I also have a PDF of the Service and instruction manual with the Rev Dec 1981 addition Thank you for you consideration, larry

On 1/4/25 07:48, Lawrance A. Schneider via groups.io wrote: > Other people get their pictures on their posts. I don't know what I did wrong. Any help?? I found a setting of thunderbird to show attachments inline and turned it on. Do you use thunderbird? If you are meaning creating an attachment, same question: Do you use thunderbird? Otherwise, with web UI of groups.io, I don't know...