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Does anyone have any design specifications or technical information on the CRT used in the Tek 576 CT ? - anyone have Xray images of that tube ? I understand for the many posts in Groups io that it was a "special" crt tube, but looking for technical details to attempt to kludge -swap in- some other CRT, in place of my dying 576 crt tube.... thinking there must be some way to do this in some fashion. thanks,

Looking at the Tek curve tracer models and schematics, I see that the actual requirements for the tubes are very modest. No high frequency performance is required, a flat face IS required, and HV potentials are LOW, so many tubes could be adapted to work. For example, in the 575, the tube has the dynamics (and pinout) of a readily available 5ADP1, but has the vert/horiz deflection on the neck. In reality, a 5ADP1 could probably be used there with 300 ohm twinlead bringing the deflection back to the socket. There is no geometry pin, but the 5ADP1 has good geometry to start with, so I think that is a doable conversion. In the 577 again the tube is not critical. A tube from a simpler low end 5K frame should be adaptable without too much grief, but the on screen gain might have to be adjusted. Again, the CRT is nothing special in terms of requirements, and there should be several possible subs with available 5K tubes. I would expect the lowest end 5K frames to be the MOST suitable organ donors. The 576 will be more complicated due to size and some odd CRT connections, but again, a low end 5K CRT should be adaptable, although the graticule and gun connections will be different. I don't have either of these here to experiment with, but I think these conversions could be done by most of the people here on the list, and should allow someone that really wants to keep their unit running in business. I am happy to try and assist anybody that wants to do it. all the best, walter (walter2 -at -sphere.bc.ca) sphere research corp.

My ancient Tektronix 547 oscilloscope with 1A1 plugin was working fine until a few weeks ago when the display suddenly went intermittent and bright, and an arcing sound came from the area of the crt high voltage circuit. No arcing could be seen anywhere, but the sound definitely came from the vicinity of the high voltage assembly. At this point, the Intensity control had no effect, and the intermittent sweeps were very bright. The sweeps only occurred when the arcing sounds were heard. Otherwise, a bright spot stayed on the left side of the display. The focus control also had only a slight effect. Suspecting the flyback transformer T801, I sourced an assembly from another 547 that included the transformer and the voltage multiplier comprised of the 5642 diodes. Symptoms remained the same, unfortunately. Replacing one of the regulator tubes in the 350V supply (6CW5) with a brand new one strangely made the arcing go away, but still no display. In fact, no more intermittent sweeps, only the ultra bright spot at the left hand side of the display. Currently, I have no way of measuring the high voltages from this assembly (10kV), so I’m not sure if they’re within spec. I also changed out the four 0.01uF caps in the Intensity circuit in case they were arcing, but no improvement. Scoping the output of the B Sweep Generator section (at tube V91), there was no sign of a sweep waveform (consistent with the stationary bright dot on the left side of the display). I’ve tested every tube in the scope, except for the 6080s (and checked all transistors for opens or shorts). None gave the impression that they would be show stoppers. I also scoped all B+ and B- rails. All were rock steady except for the +350V line, which had some ripple. Even after changing out the 6CW5, the ripple was still there. It’s obviously generating high voltage as evidenced by the bright spot on the crt. I can’t understand the relationship between the inability to control Intensity and Focus and the lack of a sweep signal. It doesn’t matter whether I’m in A, B or ALT timebases. Could the crt have an internal fault? Any advice or best guesses as to where I should look next would be much appreciated. Thanks in advance.

Came across some references & research papers online for the use of the Tek 7J20 RSS Spectrometer; .... might be of some interest: rick Tek 7J20 https://opg.optica.org/ao/abstract.cfm?uri=ao-15-11-2884 doi.org/10.1364/AO.15.002884 https://blog.everydayscientist.com/review-of-the-nanodrop-2000c/ https://vintagetek.org/rapid-scan-optical-spectrometer/ 7J20 NASA Pg. 75 https://ntrs.nasa.gov/api/citations/19770013602/downloads/19770013602.pdf NBS/NIST 7J20 Laser combustion of metals Pg. 19 https://nvlpubs.nist.gov/nistpubs/Legacy/IR/nbsir81-1647.pdf RCA 7J20 Pg. 13 ; … 45 (?) https://www.worldradiohistory.com/ARCHIVE-RCA/RCA-Engineer/1979-08-09.pdf RCA 4532a PD-Vidicon, AN-4623 https://www.one-electron.com/Archives/RCA/RCA-AppNotes/RCA%201973%20AN-4623%20Application%20of%20RCA%20Silicon%20Diode%20Array%20Target%20Vidicons.pdf DTIC 7J20 Pg. 26 https://apps.dtic.mil/sti/tr/pdf/ADA077412.pdf ** & many old posts on this Group, ...not necessarily titled accurately /g/TekScopes/topic/new_topic_outstanding/80215676 etc.

I picked up a working 2465B locally for a decent price, at least much more decent than eBay prices. It has a lot of miles on it and has certainly been used (40k+ hours) but obviously not abused. Physically and mechanically it's is really nice shape. I also did some quick tests (horizontal and vertical) with a PG506 and TG501 and calibration still seems to be just about spot on. The scope was removed from a working environment and was was part of an equipment auction for employees of the company. The only thing noticeable and bother me is that the CRT is soft which is not surprising given the number of hours on the unit and the fan is a bit noisy. Its serial number is >55000 and appears to have been assembled in the early 90s perhaps even 1990 since that's the newest date code I saw on the few ICs I looked at. The electrolytics on the A5 board haven't leaked and the NVRAM (1990 date code) is still working. I'd have to assume the NVRAM is living on borrowed time and needs to be replaced. I'll also need to take a look at the condition of the caps on the power supply boards and figure out if any are in need of replacement. I'd think with all the hours on this scope, a lot of the electroytics are going to be a little tired. Since I'd like to put a better CRT into the scope at some point, I'm assuming it wouldn't really matter if the calibration data is lost since it'd have to be recalibrated anyhow. I'm assuming the replacement NVRAM need to be programmed with some data before installation into the scope. Is the anyone out there willing to program one for me or any suggestions for a cheap programmer that would do the job? I read through the calibration sections of the service manual and while it looks daunting It seems doable. The only piece of equipment that I don't have is the Tunnel Diode Pulser (Tek 067-0681-01.) or the 15pf input normalizer (the normalizer looks trivial to DIY). Is there anything else I can use as a substitute for the tunnel diode pulser? or is there anyone in the NJ area that has one? I'm assuming it's be a good idea to replace the SMD electrolytic caps on the A5 pcb as well, even though they don't appear to be in bad shape. Jay

As many may remember, Walter Shawlee II passed away September of 2023. Since that time, his wife Susan, and children, have been busying themselves with the task of liquidating much of the electronic goodness that Sphere Research had accumulated. Susan intends to continue to make their collection of slide rules, nixie tubes and various other items available. Additionally, she is continuing in her effort to find homes for the remaining equipment. Please do visit Sphere’s site and help. Sphere’s inventory of Tektronix and HP parts has found a new home with us. We have the beginnings of a website (tekandhpparts.com), with the intention of continuing to make these parts available to the Tek and HP enthusiast community. A bit about us: 1) The goal of the website is to continue to make Sphere’s inventory available to the people like us that enjoy collecting, repairing and making use of these amazing examples of engineering and manufacturing. 2) A secondary goal is to “pay back” our retirement account of the funds used to buy the parts. It is truly secondary, and may never happen, but who knows? 3) We are retired, have three children, farm 20 acres of grass hay, tend to cows, sheep, horses and chickens, and have FAR too many hobbies and other responsibilities to have taken on another, but here we are…. 4) Our website is an amateur work in progress. Please read the home page posts for information on the site and on our progress. Tek items will be posted first, followed by HP and then “other” semiconductors and who knows what else. There is much awaiting inventorying, so if you don’t see the part you are interested in, please contact us directly (tom@...) and we will let you know if we have it. Look for announcements on the homepage as we complete the inventorying and pricing of each group of parts. Please be patient as we get the website, inventory and pricing figured out. Feedback is, as they say, a gift, so please share any constructive advice or suggestions for the site that you may have. The suggestion "You should have your head examined" has already been given! :) We can’t ever hope to duplicate the knowledge that Walter possessed, but will do our best to provide you with the right parts for your project. We look forward to getting to know our new customers, and will work hard to earn your trust. Thank you, Tom and Darla Norman

At the museum some of the volunteers would use a curve tracer to try and characterize and isolate faults. One of our volunteers used this concept to develop a low cost versatile debugging aid which we now sell. It is a two channel device that uses a weak signal to display two I-V curves on a windows PC. This allows you to compare various circuit elements and look for anomalies to help isolate an area for further investigation. We call this the Curvebug. Our web page has more information including a 9 minute video and the user manual. https://vintagetek.org/curvebug/ Dave

I got a TEK 2465A for free a few weeks ago from a neighbor. The only problem it had was a severely pulsing display. It went through boot up ok and i assumed ripple from the power supply was the issue. I searched around for some guidance and several group members mentioned CondorAudio in Jerusalem sells rebuild kits for TEK 24XX series scopes. He also has a very good rebuild guide at condoraudio dot com. https://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf The kit for my scope was only $80 + $28 shipping on Etsy (under $100 there are no tariffs) and I received it in 7 days to GA US. Included caps for all the PCB's, not just the power supply. Anyway, kudos to Yachad for making this kit available, it saved me a ton of time putting together numerous orders for high quality caps for less cost when you consider shipping from numerous supply houses. Just finished it up and the scope is working great after replacing all the ecaps & tants. Also, replaced the LIPO Keeper battery that I found from eBay for $25 that maintains the calibration. I just soldered a couple AA batteries in a battery holder to the back of the diode and resistor that the battery connects to so it didn't loose the calibration. The original battery was dated 1987 and still read full 3.5+v! But I didn't think it would last much longer. It was quite a job, but well worth the time. Thanks again Yachad!

Hi all, I noticed my 7A13 amplitude was way down on a 70 MHz sine the other day, so figured I'd run through the calibration. I skipped the input resistance section that requires the precision DC divider, and I'm using a PG 506 fast rise for the HF compensation; it's slower than the 250 ps Type 109 the manual calls for, but easier than messing with the Type 284. Through a 20 dB attenuator and 50 ohm thru termination, the 7A13 is showing about 1 div overshoot on a 5 division step from the PG 506, and I cannot adjust that out. It's so huge that I can't even see the effect of C113/C150/C250 on the corner. A bandwidth check with SG 503 says it's ~40-45 MHz. I've tried swapping the 1-2 relays that I haven't drilled and cleaned in this 7A13 with a NOS relay, with no change. It affects + input and - input alike (unused input set to GND), which has me pretty confused, as I thought the signal paths would be independent. Anyone encountered this before or have ideas on what to look at? Just as a sanity check, I tried a spare 7A13 that I'd never even plugged in, and it does not have the overshoot problem, and rise time is respectable (did not measure bandwidth because the SG 503 crapped out and started flashing 000). thanks, Adam

I use Google Translate. I don't have brightness adjustment and the reverse path of the beam is visible on my 2337. The A15 board is defective. A15 Vertical Output / H.V. Power Supply board. When I replace it with a working one from another 2337, everything is OK. Where should I "dig"? Thanks!

I am looking for someone to measure the height from the bottom of the knob to the center of the set screw hole. some dimensions on the qservice page. but not listed set screw height. same knob used in 7L13 SA and some TM500 series plugins. (https://www.eevblog.com/forum/testgear/want-tek576-collector-knob-(366-1007-00-01)-set-screw-hole-height)

I just obtained a Tektronix 1240 Logic Analyzer from the Tektronix "RAMS" Store. I Was Reading the Tek Wiki on the Easter Egg Nothing Special but Here it is. https://youtu.be/x4248B81d2c Live Stream Initial Power Up https://www.youtube.com/live/33D8S3MGMEo?si=2qidUujGNStjHSyN&t=2358 Thanks

The following photos have been updated in the SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) photo album of the [email protected] group. * photo-1.jpg ( /g/TekScopes/photofromactivity?id=3917517 ) *By:* Barry Breaux <groupsio@...>

I just picked up a 2465DVM from a TV station nearby, I have a few questions but I'm mostly looking for the rear feet/cord wrap that is supposed to be on this scope. The bottom parts of the feet are broken off, I suppose from being bashed around on a cart. Also, is it normal for the fan on this model to be loud, as if it's off balance? The 2445 I bought and got back working, the fan on it is quiet. Not so on this one. Naturally it doesn't have the original manual. I read somewhere there was a different fan put in serials after B050000 but I don't have the manual to see the schematic and part changes there.

Greetings from Louisiana! I have had several damaged shipments of the SC502, SC503, SC504 scopes. The Slope / Level switch-pot is damaged along with the knob. In a similar way the Volts/Div and Time/Div knobs were broken. In one case the shafts on all 3 knobs were broken. I decided to have shafts built in plastic and 316L Stainless steel. I took the original knob with the printed skirts and drilled out the original shaft and replace with the custom shafts I designed and had manufactured. The plastic shafts are as good as the original, and the 316L stainless steel shafts are far better than the original. I am also working on having the skirts manufactured out of 1/16" acrylic and printed with UV Ink. So now for the question(s)... 1) Does anyone have any SC502, SC503, SC504 knobs with broken shafts that need to be repaired. I can provide the shafts or repair your broken shaft. 2) Does anyone need new skirts for SC502, SC503, SC504. So far I have restored several of these scopes (more than 10). Initially I got plenty of help / suggestions from the group. Many thanks for that. Regards, Barry

I got knobs and Skirts for the SC502, SC503, and SC504s. The skirts came out perfect! See Photos /g/TekScopes/album?id=302038 Barry

Looking for the above

The following photos have been uploaded to the SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) photo album of the [email protected] group. * IMG_2585.JPG ( /g/TekScopes/photofromactivity?id=3916678 ) * IMG_2587.JPG ( /g/TekScopes/photofromactivity?id=3916679 ) * IMG_2583.JPG ( /g/TekScopes/photofromactivity?id=3916680 ) *By:* Barry Breaux <groupsio@...>

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 would like to replace the graticule lamps in my 2465b. I thought I had seen a exploded view of the front panel assembly somewhere but can't seem to find it now. Any suggestions?