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Hi, I just picked up an OT502 E/O Converter TM500 Module in a mainframe of assorted modules, and am looking for a user/service manual for it. There doesn't seem to be much online.. If anyone has a copy, paper or digital, please let me know! Thanks, Jared

Hi Everyone, My 494 is stuck in the higher bands (will not switch to 0 to 1.8ghz band) The feed to the S11 and S12 band select relays is stuck on 31v .No change in polarity when you operate the band select push button switches on the front panel. Display shows correct change in bands. I assume the front panel processor drives the relays and changes polarity but i can't find the interface from the processor logic levels to the 31v voltage to drive the relays. Probably right in front of me but can't find it. Any help greatly appreciated from you TEK experts (I am using the PDF's ,of the 494, from the net .......do not have a physical book, so my old eyes are struggling) Best Regards George

Hi all, I've just uploaded a bunch of software applications for the TDS500/600/700 series scopes. /g/TekScopes2/files/Tektronix%20TDS%20500-600-700%20Scope%20Software/Tek%20TDS%20Scope%20Software%2020241113.zip Some of this (that which isn't technologically obsolete anyway) seems to be rather sought after, so here it is. I bought a CD from a seller on ebay to add to the few apps I already had, so I'll release it for free to give back to the community. I have installed and tested it all on my TDS784D and TDS794D, but check the included readme files for specific compatibility with your scope. You will also need the HD HDD option to install these. Installation is simply a matter of copying the file structure in the zipped file directly to your scope's HDD. Check that readme for details. :) If anyone finds any missing softwares, documentation, different versions, or anything else at all, please do upload it to the linked folder and let me know so I can check it, update the archive and make it available for easy use by anyone. :) I'm particularly interested in a non-Demo version of the Power Analysis software (TDSPWR1) and the Communications Pulse Measurements software (TDSCPM1), also any documentation on the Optical Eye Pattern Measurements software (TDSEYE1) Regards, Jared.

Dear All, is there someone so kind to help me by sending the content of the disk "271X Flatness Tests" for a tek 2715 CATV SA? Thank you very much in advance Pietro

Hello all: Am Seeking a Tektronix scope 7904A service manual, Original printed version The usual online, PDF , Artech repro etc are not suitable. For museum use, by non profit. Location in USA, (or France) we can arrange for shipping.... Open to offers, or swaps, have a LOT of TEK/HP/GenRad manulas and some TEK origial probes.... Please send a PM if you have one to spare... MANY THANKS Jon

Hey Guys! Just a short introduction 'bout me. I'm a Romanian who caught the Tek bug. I managed to score a 556 (which i've gotten almost fully working) a 576(fully working) and a 7104. Fixed a bunch more 400 series scopes and other tek equipment. One of my professors in uni, who's also a dear friend, is a longstanding fan of the 576 and got himself one which is a bit of a lemon, sadly. Bunch of missing panels, dead collector supply knob (managed to fix it with 3D printing, the mechanical assembly at least, but the knobs are still missing) super duper dead caps etc and a slightly burnt in tube. Tackling the problems one at a time, I've ordered caps and parts but I also want to get a hold of two high voltage transformers. The one in his unit seems to be almost dead and mine's the rubber potted one and I'd love to change it. I've read on tekwiki that an industrious user of this forum ordered a bunch of newly made ones. Could anyone point me in the right direction? I'm, of course, willing to pay a fair price + shipping for two units (along with a keg of beer). Lovely meeting y'all and wishing you the all the best, Alex from Romania

Hello all, am working on late SN 2465 B, for museum ( non-profit ) use. has a Blown CH 1 Input attenuator, the ceramic hybrid is broken in pieces. Need a CH 1 Input attenuator TEK part 119-2342-09, OR the set of both CH1 and CH 2 119-2342-09, 119-2342-10, I think that the earlier suffix ODD number CH1 can work: 119-2342-01, 119-2342-05,etc. Alternative is replace the ceramic , TEK part 300-2159-01, input attn. Hybrid Attenuator Chip H2159 The usual sources do not have any CH1. Perhaps someone has parted out a 2465/A/B or 2467/A/B? Am open to any reasonable offer or a swap…. Can ship via post to USA or EU…. Please me contact via PM. Many thanks Have an absolutely fantastic day! Jon ARCSI.FR

Hello all: These models are very similar exept for the bandwidth, 150/350..400 MHz \. Are the input attenuators the same? 119-2342-09, 119-2342-10, 119-2342-01, 119-2342-05 119-1445-04 119-1445-05 The suffex 01/02/04/05/09/10 are relating to CH odd = CH1 even = CH2 Production variations, and interchangable.... I think they use the same Hybrid Attenuator Chip H2159 TEK part 300-2159-01 Many thanks! Jon

Do these get much use anywhere but radar design? Should they just be melted down? Available for $8 + $8 shipping (US) for all three, with screws, nuts. WR-90 TO WR-112 waveguide transition is alum by Turbo machine co. other 2 are 2 lbs of silver plated brass by GE. Ships from Albuquerque NM US

Hi all, i bought a month ago a tek 577 with a few fixtures, tested a few times and it was working but was a little out of spec, so i’ve dediced to do a little calibration and found out that 2 trimpots weren’t working (the R1245 and R528 ). Ordered some linear ones on digikey and replaced the 1245 one, now when switching the vertical/div from mA to lower ranges the protection light turn on (the dot gets greatly out of range), i don’t believe it was the 1245 that i’ve replaced maybe the preamp in the 177 or the amp inside the 577? I don’t have much time testing all the components, do you have any idea? In addition the 200 volt line on the power board is at around 218v… Thanks in advance

I have this scope here and it is doing weird things. First thing is when the Diagnostics are run, it displays a couple errors. "Processor" displays Result 114 with 1 Failure Count. "Acquisition" displays Result of 331 with 2 Failure Counts. When each individual channel is turned on by itself, each appears to work OK. But if more than one channel is on at the same time, it gets screwy. With Channels 1 and 2 on at the same time, it will not display Channel 2; it only displays the Channel 1 input. Any channel will only be displayed if the trigger input is set to a different channel than the one I want displayed. Any ideas about what the trouble is or what I should do? Zack

Are there substitutes for this tube ? I che3cked mine on a TV7 tube tester and got 0 reading for transconductance test. I thought the TV7 manual had wrong settings but I think its right. Regards, Dana.

I posted this on the EEVBlog's gigantic thread but have gotten no replies, hopefully I'll get some hits here: Hi all, I'm also a "happy" owner of a 2465A CT. I was having issues with the display jumping all over the place: https://youtu.be/g6iKEVwqY9M So I took it apart to recap the boards, but then I decided to put it together so I could get the CAL constants before recaping the boards, however, now I get an error message and no traces and the LEDS above the display (LOCK-SRQ-REM) don't light up: https://youtu.be/q4gS29u1FuY?si=lmVH3ULfq2Pwa76U From your experience, did I re-connect something wrong (maybe a connector backwards?), or did one of the boards go bad? I wasn't having any other issues before other than the display jumping. The manual says TEST 05 FAIL 24 is ADD Main Board - Positive Level is not Positive Enough. I didn't touch the High Voltage Power supply or the board that's underneath the O'scope, originally I only removed the 2 boards from inside and the one on the side with the NVRAM battery. Any help would be greatly appreciated! Thanks, George

-------- Forwarded Message -------- Subject: 1405 SSB adapter for TV Date: Sat, 17 Aug 2024 21:01:40 -0400 From: Glenn Little WB4UIV <glennmaillist@...> To: [email protected] With the shutting down of analog TV, is there any use for a 1405 other than for parts? Has any one converted on to a general purpose tracking generator? Thanks Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"

You'd think it's Friday so time to wind down, so as you do that, you stand up pushing the rolling chair against the narrow space at your bench and your large mug with cold water resting right behind you tips over, right onto the face of your project 754C which was resting down on the floor, fan side down. I've wiped it as much as I could with some cloth towels and paper ones too, after tilting it face down onto another cloth, so all that water would seep straight down into the dry cloth. There was water even in the wells of the inputs, which I promptly dried with a paper towel rolled thinly. Anything else I should worry about? Is this much less of a deal than I tend to think right now? Much more? The scope wasn't powered or anything, of course. Just being stored on the floor. Thank you. Radu.

Hi all, some of you know we've been running a Tek/HP/Etc Discord server for a while now. It's meant as an alternative to the mailing lists, for more informal chat, voice and video chat, and "water cooler talk". It can be used for anything that doesn't quite fit any of the mailing lists. It's gathered a colorful set of regulars and less-than-regulars. Some recent discussions include: - tek scope carts - agilent 2000a/3000a firmware recovery - electromagnetic vortex cannons - diy curve tracer project (tube compatible) - microprobe gov auction - plutonium welding - knife sharpening - 70s analog tape process - punch card process for configuring a modern device with graphics insert cards We have various areas such as: General: intros, pictures, showcase Tech: Tektronix, HP/Agilent/Keysight, Other T&M, Electronics in general, Audio/HiFi/Musical Instruments, For Trade & Sale, Retro Computers, Mechanical Engineering, Gear Lists, References, BSTJ, Old Journals And Texts, Cutting Edge The last few (References, BSTJ, Old Journals And Texts, Cutting Edge) are full of technical reading material spanning several hundred years. Here's a link to join. The link will work for 7 days after which you can request a new link off-list. There are no bots and no spam. https://discord.gg/79DR3Dgs All welcome

DaveH52 <ac2gl.dave@...> added the photo album Tek 2465 for sale in Montague, NJ : Recapped PS, replaced blower with fan, replaced U800 with RU800. Includes 4 probes.

I have a 2465 that I have mostly restored for sale with 4 probes. It's been de-RIFAd, the power supply recapped, the blower replaced by a fan, and the infamous U800 replaced with a RU800v2. It's reasonably well-calibrated and ready to use. I'm asking $400 picked up (or could ship then add the actual shipping and insurance of around $100). I will post some pix in a little while. Dave

Symptom: I have a Textronix TDS 460A Digital O Scope that worked fine at last use. Unit was unused for about 4 – 6 months. Upon power up the CRT screen lights up and the “clock” emoji is present on the screen. The front panel lights flash and you can hear the relays cycling. The fan runs. After about 10 seconds the unit goes into a cycling state, cycling on and off every two or three seconds. Each time it powers the fan runs and the panel lights flash. You can hear a ticking sound that seems to decrease in volume as time passes. Question: The troubleshooting procedures decision points ask, “Does the oscilloscope power up.” Does the fact the unit powers up for 2 seconds repeatedly constitute “power up”. If it does You move beyond the Backplane board. If it does not, you are looking at either a LVPS A25, Front Panel A06, Backplane A01, or Aux Power Board A07 failure/replacement. Troubleshooting: 1. Checked the voltage of the two 3V batteries. a. Battery to A03 CPU Assy. Read 2.04V b. Battery to A09 DSP Assy. Read 3.0V c. Reversed batteries on reinstallation. No change in symptoms. 2. Verified 115V AC at pins 1 & 3 of J! on LVPS. (Aux Pwr board to LVPS) 3. Performed the LVPS troubling shooting procedure (Fig 6-31 pp 6-78) a. Checked voltages (Table 6-11, pp 6-79) b. All well below spec. in millivolts.. c. Coming down left side all answers are “yes” except last question (Are secondary voltages within Spec (Table 6-11, pp 6-79). d. Procedure would indicate that the issue is not with the A25 LVPS. 4. Disconnected white wire between Aux. Pwr. Board and LVPS Board. a. No change in performance or symptoms. Remade connection. 5. Disconnected plug from J2 (22 pin connector on A25 LVPS board). a. No change in performance or symptoms. Remade connection. 6. Pulled the LVPS board from scope. a. No obvious problem. No corrosion, no swollen E caps, no burn sites. b. Checked E caps in circuit with a MESR meter. Seemed ok. c. Read something about R410 (1M). Read it while in circuit and it appeared to be open. Planning on removing one side from circuit and read again. 7. Performed the Backplane trouble shooting procedure (Fig. 6-46 pp 6-92) a. Again, the question goes to what constitutes “power up.” i. If “yes” could be issue is elsewhere. ii. If “no” could be problem with A25 LVPS, A06 Front Panel, A01 Backplane, or A07 Aux. Pwr. Board. 8. Pulled A03 CPU, A02 Display Assy., and A09 DSP Assy. a. No obvious problem. No corrosion, no swollen E caps, no burn sites. b. Reinstalled all three. 9. Visually inspected A01 Backplane board while Ao3, A02 and A07 out a. No obvious problem. No corrosion, no swollen E caps, no burn sites. I'd appreciate any advice, insight, and ideas on where to go from here. For info, you are talking to a mechanical guy. If it had oil or water leaking out or made a grinding noise I could figure it out. Thanks, 73 Harrison N1FAM

I’ve been working on this 585 for a while now and I’m finally making progress. A little backstory; I bought this from a fine gentleman with the understanding that it wasn’t working and may never work. When it arrived the CRT was shattered in shipping, which sucked because it was a P2. Anyways, ordered a “new” CRT off of eBay and no trace, no nothing. Tinkered with it a little bit, rebuilt the HV supply and nothing. Put it under the bench for a few weeks. Today I decided to get it out and play with it some more. Turned it on, and lo and behold, the CRT showed life! Checked voltages and had the 325 and 500 way off, swapped some tubes around and got that sorted. Now everything’s back to normal but still no trace, just a “bloom” on the CRT. I’m at my wit’s end now because I can’t seem to get a trace. To me, it’s almost like the trace is off the screen and I’m getting reflections. The “bloom” will pulse with the time base, so it’s trying to work. The best way I can describe the “bloom” is a mushroom cloud. Any ideas?