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I have a Tek 485 that I have had and used lightly for 20+ years with no issues. That is until last night. I hadn't used it in couple of months. After turning it on I went to adjust the Intensity and it went totally bright and stuck there. The Intensity flickers when the control is moved, but when left in any position, it's always stable on high. A second symptom simultaneously appeared. The retrace of the beam is not blanked. So, both issues point to a problem with intensity modulation of the beam. I thought I had the service manual for this, but I am unable to find it. I am sure the first thing I need to do is get a copy of this. What is the best source for this? I am a retired electronic engineer, so I have no problem digging into the scope. But I only have one, so I hope I don't need another to troubleshoot this one. Any suggestions on what areas of the circuitry to look at would be appreciated.

Hello all, Have a 7904A, low SN, 1982, stored for decades. Usual cleaning of switches, contrlols, the CRT, bright and in focus. But all surfaces, PCB, PS, HV, CRT arencoated with dust. Suggest I vacuum with brush nozzle, finish with compressed air? Which is better? Am Wary of Air, Vacuum ESD, damage, should I Use Metal nozzles , earthed? Many thanks, Have an absolutely fantastic day Jon

Does anyone have an extra one (does not need to be working) available? ePay prices are outrageous. Need one with the probe. I am in the Bay Area CA. I will cover shipping. Please contact me off list. Thanks, Dave

Hi All, I do not know where else to post this, but there is an individual in Germany on the Kleinanzeigen Portal selling a cheap and in good condition Tektronix 577. I have bought this, and it was never delivered. Today I see, that the same device with same description but different seller appeared again. Be warned, I am pretty sure, this is Fraud.

Hi all, I recently acquired a Tektronix 475 oscilloscope. I've been looking to get an analog scope for a while and was really excited to finally pick one up. It was sold as working, but seller wasn't familiar enough with these to realize the display did not work. I'd like to try and fix it, and already got a partial refund for it. It does power on and indicator lights work, and all the controls appear to work as well, but the HV circuit appears to have some sort of problem and I'd really appreciate some guidance in repairing it. There also isn't any CRT noise or glow from the filament. Checking the power rails, all are pretty much spot on, aside from the -2450V point which instead fluctuates quite a bit but reads from about -550V on average. I've already checked the caps around it (C1318, C1374, C1316, C1317) and all are fine, as well as the 1.5A fuse which is also intact. I've inspected for any cracked solder joints to the best of my ability but there's nothing obvious and I already went ahead and re-flowed the few that looked a bit suspicious, but its made no difference. From what I could find it seems like the next step would be check if its the multiplier, but I'd like to avoid taking it apart enough to do this if possible and replacing it doesn't really seem that viable regardless. Does anyone have some advice for anything else it might be or things to check? If there's any measurements you'd like that would help please let me know. Best Regards, Jaden

I have a puzzle. Just replaced 3 caps on the power supply. It's the common small refer caps. On powering up I see the scope cycle on and off repeatedly. Any ideas Alan

Bonjour à tous! Just received a 7904A, little used in decades. So far, a fine CRT, all works but scratchy CRT controls and a few switches. Will CLA them. Seeking advice and tips on typical weak points, e.g. tantalum capacitors. Finally has anyone tried to reduce the fan speed? Many thanks, Have an absolutely fantastic day! Jon

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