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I have a TDS520D ( 2 channel, 500Mhz, 2GS/sec) that I am planning to bring to a local flea market to sell. I'm trying to figure out a reasonable asking price. Doing a Google search returns a very wide range of asking prices. It boots up fine and the self-test is good. Everything on it seems to work fine but haven't verified the floppy drive or printer port are working, but I have no reason to believe that they aren't. Looking for recommendation on a reasonable asking price. Thanks, Dale

Greetings, What is the recommended substitute for the WG1306 diode? 120v 150ma trr=4ns Barry

Hi Teksperts, Is it possible to identify which options are locked within a Tektronix TDS640A from the serial number? I understand that many options are present but 'locked' from access on lower spec models and are unlockable with a hardware/software 'hack'? I am particularly interested in the FFT math function... I am aware that there is often an extra 'sticker' on the rear of the instrument declaring enabled options like (1F floppy drive) etc but is there a database that explains what hidden options are available? Secondly:- Does anyone know if the VGA output displays in colour even if the oscilloscope is shipped with a monochrome screen (and if VGA colour), can the screen be substituted for a colour LCD like the "CRT and shutter" swap previously described in this forum? Thanks Dave

Hi all, I am repairing a Tektronix 2784. Therefore i'm searching for the Processor ExtenderBoard with the SerialPort or a Circuit Diagram for this. I know it's a 85C30 Dual Serial Interface from Zilog and it uses &0100 to &010F to communicate. Thank you for help. That's the first Time I'm using groups. Juergen

Thanks in advance. The squished horizontal is due to low voltage on the 8.6V--in fact all the DC voltages are low by about 15%. (I have read all the 2235 power supply problems and got the schematics in large format.) I have extensively probed the power section before the CRT HV section. i have replaced some caps. When i unplug Q9070 the voltages are fine so i am looking in the section the follows the mosfet-bottom of the schematic and Q908. VR943 is flaky and it is connected to Q944 which the table says is a SI NPN 625MW, TO-92, Manu part # is TO7391E2-this is a pretty general description! Before i replace the VR943 i want to check Q944. i (think) equivalents may be MPSA42, MPSA55, MPSA14, BC337, BC547B. Can anyone definitively state the proper equivalent?

Hi all, I have a rather sad 5B44 with broken timebase knobs. My copy of the service manual is a not a clear enough scan to tell for sure which part numbers these are so I cannot give specific references. The knob(s) are concentric and have skirts with the sec/div marked on them - or would have if it still had them. Can anyone help with identifying the correct part numbers please? Does anyone have a non functioning 5B44 with intact knobs they would sell for parts or part out themselves please? Or does anyone know where to look for these parts? I have been looking on fleaBay intermittently but not much luck esp. with not knowing the exact part numbers I need. Thanks and kind regards, Daniel

While looking for some manuals I found the bitsavers.computerhistory.org site. It has some very high quality manuals including TEK ones. Regards, Brian

ricky covell <hypomnnqn@...> added the photo album TU-50 ( /g/TekScopes/album?id=301235 )

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

Hi everyone. Hoping that someone might have encountered this before. So after the 492 repair, I picked up a nice, clean 2430A which was dead. Including the Rifas, the power supply board had 10 completely failed caps and a couple or three toasted resistors, which once replaced gave the scope life once more. /g/TekScopes/photo/301027/3891759?p=Taken%2C%2C%2C50%2C1%2C0%2C0 All the LV rails are present, although uncalibrated. I've have a look over the boards for obvious damage and tested many caps and semi-conductors for shorts, as well as reseated the socketed IC's and cleaned the contacts on the hybrids. So far no difference. The issue is, that once the scope is turned on, the scale illumination lights up and the scope clicks through the start-up, /g/TekScopes/photo/301027/3891763?p=Taken%2C%2C%2C50%2C1%2C0%2C0 however nothing appears on the display, until there's a beep, and then the screen glows off to the right hand side. /g/TekScopes/photo/301027/3891765?p=Taken%2C%2C%2C50%2C1%2C0%2C0 No control button or knob makes any difference whatsoever. If I remove jumper J100, /g/TekScopes/photo/301027/3891766?p=Taken%2C%2C%2C50%2C1%2C0%2C0 then the scope no longer beeps and it just displays a bright dot in the centre of the screen. /g/TekScopes/photo/301027/3891764?p=Taken%2C%2C%2C50%2C1%2C0%2C0 I'm slowly working my way through the manual but if anyone can give a heads-up as to where the problem might be found, then that would be much appreciated. The manual states that the beep occurs when there is a short in the unregulated section of the power supply, yet I have checked all the PSU test points, IC's and caps and nothing there is obviously shorted.

Good afternoon, I am a humble electronics hobbyist with some knowledge. I have repaired various household devices, but this time I decided to take on repairing my TDS744A. I bought this scope online from Japan. When I first turned it on, there was no image on the screen, though it did display through the VGA output. A few days later, I turned it on again, and only the front panel LEDs flickered. I have recapped the entire CRT board following all recommendations, and I also replaced the RIFA capacitors in the power supply. Unfortunately, the issue persists. I don’t want to go any further on my own and am reaching out to you for assistance. It would be very helpful if you could advise me on where to look to resolve this issue. I would be very grateful for any suggestions. I’m attaching a video showing the issue. Thank you very much in advance. https://www.dropbox.com/scl/fi/1mch7o60zy11yvqqpv6z2/WhatsApp-Video-2024-11-06-at-12.03.59-AM.mp4?rlkey=ae32pw0fnk7uv4328vmvph6zj&st=u3snnwb9&dl=0

The Edison Tech Center is clearing out it's collection of old scopes and test equipment. If interested, check out https://www.facebook.com/marketplace/item/1006715277986797

AFAICT I am now the only active moderator. I think we need some more moderators. Cheers, David

Hi, the spot is always coming vertically outside the screen, when I change the polarity (about one graticule outside). I have tested the VertPos Adj pot but it is not enough to get the points back in the correct vertical position. any suggestions? thank you,

Jim, Do you have anyone in your environment with a not too old laptop? Get it for a box of cigars, install an SSD and Linux Mint. You're back in business! Best 73 de Harke

My garage lab computer went kaput recently, and I need to get another one to control my instruments via GPIB and USB. I had a tower running Windows 7, although it was originally my wife’s computer running (ick!) Windows Vista. Sooooo slow! Anyway, I don’t need anything fancy, just a PCI slot for the GPIB card, Ethernet jack for Internet connection, and at least 4 USB jacks (kbd, mouse, USB microscope, GPSDO). Mini tower or thin client would be great. Anybody have a PC they don’t need? Thanks in advance. Jim Ford Laguna Hills, California, USA

Hi all, I have a 2465A scope here which fails to boot. It briefly flashes some LED's before going to sleep. No beam finder, no scale illumination etc. The PSU had the Rifa's replaced and the voltage test points are all fine and within spec. Obviously I'll be going through the manual, however thought I would post here first, on the off-chance that someone might already know what might cause these symptoms? Thanks in advance, James

Jim- let me check as I have a tower doing nothing...hss not been used for long time, will know when I get to the shop over the weekend. shop is in no. SF bay area Renée

Hi all About a year ago you helped me fix a Tek 2236 scope which is doing well ever since, for which I'm thankful. I'm planning to tackle the refurbishment and / or repair of the 2445B/2465B scopes that I have before I move on to the older ones. The 2445B boots up fine, but shows no trace. It smells of capacitors after a minute or two, so I don't use it any further. The 2465B works fine, but I have the feeling it has some issues focusing over the whole CRT. Either the middle looks sharp or the edges. I started taking the 2445B apart and took out the PSU boards. The capacitors aren't good anymore (they are visibly leaking) and there are those dreaded RIFA caps on it too. I understand that both these scopes have the same or similar PSU and therefore I'll probably just replace all of the electrolytics on both boards, except the two large ones. Are there any specific guides or recent capacitor lists available? I see that there are many threads and discussion about this. If nothing speaks against it, I would just replace the PSU electrolytics, the RIFA caps and the surface mount capacitors on the side board like for like for both scopes. I also see that there are those Dallas NVRAM chips on board, I know them from old computers. While for an old mainboard they just hold meaningless CMOS setup data, I understand correctly that for this series of scopes they contain the calibration data? Any suggestions on backing up these values? On some old mainboards I dremeled the Dallas chip battery contacts and added a regular lithium to it, but I would like to have a copy of the data before I attempt it here. I have some old stock of these chips too, but I would have to check the remaining charge as well... Thanks for any pointers.

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 correct RG223/U cable and have 012-0482-01 made with the correct cable. -- Jeffeelcr