#170

Lets take a look of a Tektronix 465 that was sent in by an annonamous viewer.
This will be part 1 of this series.
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[@richpayton7162]

After struggling with the loss of the HV on my 453, I used a small B+K for audio work until some dirtbag stole it. I was lucky to find a 465 locally, in VG+ condition. After a brief run through of the functions I took it home for a buck thirty, which included the cart, operators' and service manuals, and a big box of probes, adapters, and cables. Now I'm re-learning the 465 which is a kick. Very happy to find this video. Liking & subscribing right now. THANKS !

[@chopper680]

The tek 465 brings back good memories. I was sent to Beverton OR to be factory trained to repair, troubleshoot, calibrate them. Great scopes good times

[@Waltkat]

I bought a Tek 465 back in the late 80's when the company I worked for (Varian Associates) was clearing out a bunch of excess equipment. I think I paid $50 for it back then and it came with the owners manual along with a service manual. It worked great for several years then the trace started to become intermittent and finally disappeared. The indicator lamps still light up so it at least has some power. Looks like I'll have to pull it apart to see what's going on. I'm willing to bet that some of the capacitors have bitten the dust after this many years. This video will be very helpful.

[@Torogol85]

Sir, I wish a successful repair for your Tek 465

[@aunulimansfield8256]

I just acquired a 465 myself and your video is providing me with good information for when I go to repair it.

[@cthoadmin7458]

The Tektronix 465 must be the finest piece of test equipment ever produced. It’s a real pleasure to use. Jest can’t get my head around modern scopes. Socketed ics and transistors!

[@TheRadioShop]

I agree. And a pleasure to work on

[@bodhidharma9363]

Classic scope, spent many long nights in university electronics lab studying all the knobs on this scope until I understood what they were for. 30 years later I would still meet senior staff engineers who had no idea what is the reason between normal and auto trigger, or trigger hold-off.

[@emylrmm]

I had a Tek 475 for a few years and really liked it. It had an intermittent CRT so I gave it away to a charity PC repair facility in Vancouver years ago

[@draganstefanovic7723]

I have had a device like this for the last 30 years and I have to say that it is somehow better than the new digital ones I work with every day.

[@xraytonyb]

Good troubleshooting, thanks for sharing! We used these scopes a lot back in the 1980's to align the video chain on the cardiac cath labs in hospitals. The video was 1024 line rate (yes, we had HD video back then, pretty cool) and these scopes were great for video camera alignment. We also used the little Sony/Tek 314 storage scopes to capture the kV and mA waveforms for the x-ray exposure output. If I knew then what I know now, I would have saved a few to restore. Most of them got thrown away by the company and got replaced with Tek 2221 and 2230 digital storage scopes. The triggering was much better on the older scopes. I think I still have one of the old 2221 or 2211's somewhere, but no more 465's. Thanks again!

[@TheRadioShop]

Thanks Tony. I appreciate the comment. Those old Teks are great scopes.

[@pibbles-a-plenty1105]

Ingenious! I like your bench top equipment lift for raising items up to a convenient work height and angle. I can't wait to get out to the garage and build one for my work bench. Thanks!

[@lylewatts6370]

Great video and nice to see the step you do to repair the scope. I will be waiting for part #2 . Thanks Buddy

[@TheRadioShop]

Thanks, part 2 coming.

[@billpowell5931]

I have watched this video more than once. Love the methodical attack on the problems. I have a 475 the I sometimes use. I need to open it up to inspect and check the low voltages. Thank you for sharing.

[@TheRadioShop]

Thank you Bill for the nice comment. I try to use practical approaches in my repairs so everyone can follow along. Good idea to check for low voltage on that 475 and also ripple.

[@BrightBlueJim]

Boy, that sure takes me back. I fixed many of these in another life. The second power switch position was used for models with an option to run on 12 or 24 VDC power. These had an inverter board, and a separate option added a battery pack that was stacked under the 465 or 475, the full width and depth of the scope, full of big, fat NiCd cells. It was heavy. Anyway, the second power switch turned on the inverter, when DC power was selected with a separate slide switch. The inverter-equipped scopes used a different main power transformer that had both 120/240V and 12/24V primary windings.

[@TheRadioShop]

Thanks for that information. Glad you shared this. The scope is working like a charm now. Will get part 2 uploaded soon.

[@billygamer3941]

I picked up two 465B scopes for C$ 25 each. Both were working at the time but one now demonstrates loss of trigger stability followed by dimming of lights and slowing of fan. Your investigation has provided a hint and the confidence again to dig into my sick scope. Thank you.

[@pierrelataillade7564]

Wow..... I really enjoyed this vid buddy. Now I see why test equipment are so essential in line of work... thanks for sharing. 73s

[@TheRadioShop]

Thanks Pierre, We cannot live without them.

[@felixcat4346]

You have to love this repair video. Absolutely ever action here leads to a positive result for the repair in baby steps. This leads to a working scope with no problems at all. There is no waisted effort. Just like in real life. Brilliant.

[@BrightBlueJim]

Of course, with anything but LIVE video, a wide variety of wrong guesses and dead-ends can be glossed over, with the magic of editing. I'm not making any accusations, just pointing out the possibility.

[@BrightBlueJim]

Oh, duh. Didn't detect the sarcasm. Never mind.

[@TheRadioShop]

Thanks Joseph

[@TheRadioShop]

This is very true. Simply edit out the dead ends we hit. I do show a lot of failures and road blocks in my videos. And hope it helps others learn from my mistakes. As soon as I get get part 2 uploaded you may even see a few in it. Specially when we find what is causing the no trace issue.

[@gregfaris6959]

A few years back, after working for many years with digital scopes, I got a bit nostalgic for the "good old" analog days of my youth, so knowing the reputation of this scope I actually picked up a very good 465B on eBay. I didn't have to fix anything - it was in perfect operating order. Even the feet that were missing on the one here also have slots to wrap the cord around for storage - typical of 1960's style (even though the 465B was from 1980). The scope worked fine and kept every promise, but I never actually found anything it could do better than my digital ones, and because it was so big and heavy I didn't ever want to take it anywhere, so it started gathering dust. I can think of a hundred things my newer scopes do all the time that this one cannot, but I can't really think of a single thing the other way round, except for its beautiful vintage look - so I ended up selling it off. I thought I would like the 465B, but I just never did. If I were to feel the yearning to look into an analog scope today, I would probably be more drawn to a more capable contender like the 2465.

[@jaybats7865]

Just amazing, hats off to you my friend keep up the good work

[@surgingcircuits6955]

Good job, well explained. Thanks for the vid!

[@fenderblues1744]

Brilliant way to go checking there Buddy. Superb.

[@TheRadioShop]

Thank you

[@theradiomechanic9625]

Nice Classic Work Horse...looking forward to seeing it on your bench.

[@TheRadioShop]

Will be nice to have this one up and running. Thanks for stopping in.

[@TRXLab]

Great enjoyable walk through Buddy. Nice scope I still have mine :^) Thanks for sharing!

[@TheRadioShop]

Thank you Peter. Good old classic scope.

[@bigmac965]

I'm enjoying the resurrection process on this scope! I thought you were there when the panel lit up, but then the no trace. I was disappointed, but you found it quickly. Thanks for the education, Buddy. (I thought it was your chair squeaking too...)

[@TheRadioShop]

Thanks, I have more updates on this coming soon. Hold on...

[@dougmcartin3881]

I guess you could say that the 465 was the Simpson 260 of scopes in it's day. It was the industry standard from the time of it's introduction in the late 1970's and was made for many years right through the 1980's. They were on just about every university electronics lab in the country and well as in industry and manufacturing. I wouldn't worry too much about "unobtanium" parts in these Buddy. They made so many of these units over a long period of time that there are still plenty of parts donors out there. Thanks for another great video. 73 Doug.

[@TheRadioShop]

Thanks Doug for sharing that.

[@mikesradiorepair]

Definately a classic scope. Have 2 of them, one of which I used for years until upgrading to 4 channel scopes. Nice to see your making good progress on it.

[@TheRadioShop]

Thanks Mike. Real nice old scope. Made a bit more progress on it.

[@HansDelbruck53]

D-e-f-i-n-i-t-e-l-y y-o-u-'-r-e

[@denneywilliams300]

Awesome job and thank you for very informative video,s looking forward to more.

[@ngovietduy]

works and looks wonderful

[@rong3194]

I have a few of these scopes, and restored the 465M version, which is modular, built for the Military. Fun to watch you work.

[@TheRadioShop]

Thanks Ron.

[@andrewverran3498]

Hi Ron, i also have a 465M . Are there any other differences between the M and the 465B other than the heatsink instead of a fan? Cheers

[@PapasDino]

Love those old analog scope...back in the day I had a 475A that I used for years before getting the 2440...only problem with the 475 ended up being trace bloom that was common. Hope when you get the horizontal sweep working you'll have a nice sharp trace. Thanks for sharing...looking forward to part II. 73 - Dino KL0S

[@TheRadioShop]

Thanks for that Dino. I will get part two up shortly. More interesting finds to come.

[@marcogarcia5323]

Very ,very well Uncle Jessy congatulations

[@tectalabyss]

Hi Buddy. I haven't forgotten . Just been busy.. Love the scope collection you have. Thank you for sharing. Has always Liked,Shared and added to Playlists. Bobby

[@TheRadioShop]

No problem Bobby. Take your time my friend.

[@cuban9splat]

I heard the noisy work light arm too but thought it was either your chair or your knees LOL. Very nice video Buddy. I love watching you work. Very methodical and logical. Good job and thank you for sharing it with us! 73 DE K7RMJ Frank

[@TheRadioShop]

I think I got rid of the squeak. I quit bending over...

[@wa4aos]

Hi Mike, I was sa Field Engineer in the 80's late 90's and literally flew all over North America with a Tek 465 or 465B with me. Since the late 90's I have owned 2 electronics businesses and I have a number of Tek 465 and 475 scopes I use to this day. They are unbelievably dependable and seldom ever give a problem. Now with some age on them I occasionally have a problem and it's usually a capacitor. There are some tantalums in the 46 and 475 and i replace them with electrolytics when I have the room. I did lose a transistor on the input of channel 1 on a 465, my fault. I have used other scopes including HP, B&K, Heathkit but NOTHING beats a decent Tek scope. The new digital scopes are fine and multi color trace is nice but when I really need to find an intermittent problem, I always use the 465 or 475. I think you will find the 465 to be your goto scope very soon. I remember in the 80's in particular, walking through airports around the country and occasionally seeing another FE lugging a 465 scope as well. We serviced large disk drives, Mag tape units and troubleshot mainframe power supplies where you might have 30 or more large power supplies in the system including system, drive farm, tape farm and just one had excessive ripple and causing system crashes. The 465 always saved the day. Oh, we were not allowed to check our scopes and had to hand carry them on our flights. That was back when no one had roll around luggage. Yes, we would lug thos 465's with our briefcases. No wonder my arms are longer than most peoples. LOL 73, Glenn WA4AOS

[@baghdadiabdellatif1581]

Thank you from north africa

[@stevec5000]

I got one of these pretty cheap at Goodwill. It has several problems that I had to fix but works OK now.

[@TheRadioShop]

Nice find at a Goodwill store!

[@kardeef33317]

Great Video buddy. Thanks again. I bought a old 10mhz analog scope for 5 bucks, been wanting a analog one. I have to fix it though.

[@TheRadioShop]

Could be a useful learning tool for sure.

[@johnbellas490]

Hello Buddy !! Good to see you again !! Good progress on the 465 !I bought a Tek 465 with the scope mobile about 5 years ago from P+T Surplus in Kingston N.Y. for 75 dollars the probe case was with it also with one probe. Got it home checked it out and it was working A.O.K. I still have it and it is still working unit.I have used it a lot! and I plan on doing a fair amount of P.M. Work on it shortly like cleaning and replacing some filter caps and some of the caps in the high voltage area, including a few tantalums that like to go bad !! There was a LOT of these scopes made and they were and some still are the WORKHORSE used in some shops even today yet !! John A Bellas KC2UVN

[@TheRadioShop]

John sounds like you got a great deal on that scope. Looks like the prices are all over the place on them now. Thanks for sharing.

[@dennisperusse3837]

I have that model and a conar 255 solid state scope on my shelf. Great video. :)

[@TheRadioShop]

Thanks Dennis, I am not familiar with the conar.

[@dennisperusse3837]

The Radio Shop : The Conar was an old student model scope. I got mine in an antique shop before I knew what kind of scopes were out there. It’s solid state and works okay but compared to the 465 it seems almost primitive by comparison.

[@buildstoys]

Great video Buddy, I've got a 465m I now have the sudden urge to get off the shelf and onto the repair bench :). I also own an Owon (my first scope), but mine is the 25 megahertz version. Although the screen is bright enough for me, I agree the contrast isn't very good.

[@TheRadioShop]

Great, you can do it. Fun to work on. Owon........LOL

[@kevinanderson8295]

From my self taught lessons in electronics, I'm always learning that capacitors must not be overlooked in circuit board repair because they go bad and then turn to resistance and can short

[@old64goat]

Nice scope Buddy, well I don't feel bad that I have 7 scopes....LOL The best one is my Tektronix 2236 but it is missing both the clear disks on the volts/per div knobs. Nice work Buddy, be looking forward to part 2

[@TheRadioShop]

Thanks Bill. We need to find you some parts.

[@old64goat]

That 2236 was given to me by a good ham radio friend of mine, the scope works good except I get errors on the LED display screen. The rest of the scope works good, other than buying another scope just to get those clear disks I was never able to find them anywhere.

[@jonmullins8460]

I might make you a bit jealous with what I'm about to say ... About 6 months ago I picked up 2 Sencore SC61 scopes and a Tek 465 for $60 total. One sencore was good, the other had one channel off the bottom of the CRT. That one is fixed now. And i haven't had any time to check out the 465 yet but I do know that the channel 2 BNC jack is bent.

[@TheRadioShop]

Wow Jon, nice score! Yes I am jealous. Good find.

[@MikeRR142]

Thanks for a really good troubleshooting video. Learned a lot about the methodology and the logical steps you take to zero in on a problem. I was able to follow your process and it made perfect sense to me right up to the one hour mark. How did you know to question the tantalum capacitor? You seemed to instantly recognize it had been previously replaced and suspected it to be shorted. This had me question my confidence in being able to troubleshoot. It’s like we went from a systematic process to magic. 😉

[@tiggywinkle1000]

Tants are a known 'stock fault' on these 'scopes - no magic - guy's just got experience.

[@paul.alarner6410]

you possibly wont hear the fan running as they are almost silent,i had to take mine apart to check it was running as i couldnt hear it,to my supprise it was working fine!.

[@emylrmm]

Q1556 is called a Darlington transistor. It's a very high beta gain.

[@merashallan]

If you want any horizontal sweep set horizontal display to A and trig mode to Auto. Then play with the A trigger level. I noticed those switches were not in the right position. Another quick test is to put the trigger source on line. I wouldn't bother with the B (delayed) sweep until I get A working. Nice video BTW. I did not realize the 465 had an analog power supply. I have a 475 on my bench that probably needs a little work on the sweep but is servicable. Time to download the 475 service manual and see if I can tune it up.

[@TheRadioShop]

Yes you are correct, But this is the only setting I can get to even display the dot. I found a few more issues and will update soon.

[@merashallan]

I look forward to it. I find your videos very instructive.

[@BrightBlueJim]

Yeah, this was before Tek got good at switching supplies, and the 46x/47x series was not a platform they wanted to compromise. During the same era that these were produced, Tek also built a more economical series, the 432 and 434. These were lower bandwidth, like 25 MHz, and were electrically similar to Tek's other economy scopes, the T9xx series, but used a switch-mode power supply. I always dreaded working on these because they ALWAYS had power supply problems, and were not easy to work on.

[@paul.alarner6410]

where did you get the grabber from that goes on your probe ground lead,or whats it called,i have grabbers but none fit my dmm probes.

[@STBRetired1]

Silly question here - what's the proper configuration of the variable transformer and the isolation transformer? Line 120V - Var. Xfmr - Iso. Xfmr OR Line 120V - Iso. Xfmr - Var. Xfmr? Several years ago, I picked up ten of these Tek 465 scopes. Figured repairing them would give me something to do in my retirement years. I'm finally getting around to opening them up. It's been many years (decades) since I've done electronics work so I need some mental refreshing. Your videos are great for me.

[@glennwoodward77]

I'm curious where you picked up new capacitors? I have a bad 5000mfd on the -8v rail. Any tips as to what cap I should order?

[@ironman7261]

Only have 2 an old BK and the Rigol you have but I think we have all wanted a tek at one time. I have my eye on Tek 7834 storage mainframe someone here is selling that I always wanted when they were still being made.

[@TheRadioShop]

Cool deal, I hope you can get it.

[@ovalwingnut]

Good times 👍😁

[@randsipe224]

Does anyone know where to get the large body electrolytic caps in the power supply. The ones with the ground lugs. I doubt you can order something like that from Digi Key.

[@N5KDA]

Thanks, I have a 465 and a 475. That will help a lot if I have an issue.

[@janfluitsma8274]

I saw a 475 last week in the IBM Hursley Museum.

[@TheRadioShop]

Cool. Thanks

[@N5KDA]

Yep, I like the 475. It's identical to the 465 except the 465 is 100 MHz and the 475 is 200 MHz.

[@TheRadioShop]

NICE!

[@BrightBlueJim]

N5KDA: Saying the 475 is identical to the 465 except for bandwidth is like saying ... I can't even think of a similar thing. Maybe it's like saying a Ford F350 is the same as an F100 except for the load capacity. The 465 and 475 used pretty much the same power supply, but almost everything else was different, due to improved specs in sweep speed and triggering in addition to bandwidth. Similar yes - their block diagrams are indeed identical - but not even close to identical otherwise. Even the CRT was fundamentally different, using a dome mesh that magnified the electron beam after deflection, which allowed the deflection to run at lower voltage swings without reducing the display size. But the tradeoff with this was that the 475 and even 475A had a very noticeably fatter beam width (and beam blooming at higher intensities, which someone else mentioned) than the 465, making precise measurements more difficult to do. I have a bunch of Tek analog scopes now, but have resisted buying a 475 because of this.

[@gliderp]

Makes me feel very old. I cut my teeth on the 465 / 475 series scopes way back when.

[@TheRadioShop]

LOL, we all getting old I think. Great scope.

[@geraldwilcox2427]

Like the videos. Can you tell me what the difference is between the Tektronix 465 and the 466 is . Thank you.

[@johnschrader6738]

How hard is it to replace channel one volts/div light?

[@johncundiss9098]

New 500 dollar HF tuner ordered. I at the door, door closed, I holding my little dog, dog is nice but exited. I wave hi he does the same. Takes my 500 dollar tuner and just flips it onto the porch and it rolls over 2 corners to the door. I WAS PISSED!!! I stopped him and told him I got security camera and you need to wait here until I am sure there is no damage. I cut box open. was packaged correctly, no outer harm, took cover off and all ok. I said the word "BLOW!!!" and slammed door in his face. I not mention make, model, or carrier. I think all have good and bad in them, just depends.

[@TheRadioShop]

Man I hate that. What are these guys thinking. They have no respect for folks stuff. I lost an HF amplifier before .

[@johncundiss9098]

Glad you said that. I was considering an 811H Ameritron. Good bang for the buck and I do not talk a lot so should last some years before tube replacement. How do I get it here knowing it was not banged around, dropped and abused on the way here? The amp itself can take a few bangs but the tubes are rather delicate. Any suggestions other than holding the delivery person hostage while I test the amp? 73's

[@ambersmith6517]

i have one just like this one only have the screen is working could you please tell me where to start

[@mikeharnett2410]

Beginner question: When working on a radio how do you know how much signal to inject into the antenna port from your sig. gen.? Do you just turn your generator down to minimum value and gradually increase the signal strength? Or what? Thank you. I really enjoy your videos but would love it if you'd explain some of these basic things.

[@danielmelendrez1616]

I'm seriously thinking of bidding for one of these. Should I? Great job!

[@kennynvake4hve584]

This is off question or topic here..has anyone worked or used a heathkit T-3 signal tracer..and if so, does the 12A6 tube get so hot you cant touch it in like 40 seconds? Hope this dont get kick off for some reason.

[@grhinson]

Have you tried using a dedicated lcd monitor oriented for pdfs turning one with the length going up and down?

[@TheRadioShop]

Yes the monitor over the left side of the bench. I want to mount it so it rotates.

[@rosshollinger8097]

I like your video on this scope. My only complaint is that your hands are in the way of seeing what you're doing. I have one of these and all the rails are spot on except the 5v rail. The rectifier is cracked, which will be replaced. I sure wish I could've seen more of what you were doing, but I can follow the service manual.

[@cat-lw6kq]

I have 2 old Hitachi scopes they are excellent scopes. You can get one on eBay at a very reasonable price.

[@richardshort4587]

Very interesting video thank you. Would you be willing to offer me some advice please. As a newbie just starting to put together a workshop, I have found for sale close by three scopes and I can’t decide which one is the best choice for the money. The three models are 1) Hitachi V-525 50MHz. $100 OBO 2) Tektronix 466 100MHz. $150 OBO 3) Lecroy 9400A 175MHz. $250 OBO All look in mint condition with no bashed up cabinets and all front ends looking new with zero ware. All come with manual but no probes. I am hoping to get my ham license this year that’s why I wish to begin collecting equipment. One final question would be which brand multimeter to purchase on a budget to start with. Thank you. 73

[@francozappavigna9141]

I have a TEK465 that makes a very strange defect: there is a ripple of about 10 MHz in all power supplies. The ripple propagates in the circuits and the track is all wavy. I've done a lot of tests, but I can't understand the cause. Has anyone had a similar problem?

[@dariodraiman6339]

Really good video! Great job! I have a digital Tek TDS1002B since 2008 and I'm happy with it. Recently I run into the opportunity of buying one of these used Tek 465 for $150. Is it worth buying and having it?

[@TheRadioShop]

Thanks for sharing!

[@aaronson2540]

That's not a good way to heal your shoulder Buddy take it easy!! 😀.... Nice Scope Well Taken Care Of.

[@TheRadioShop]

Yes it is a hefty beast. I had some help bringing it in. Thanks Aaron.

[@Ronnie9710]

Great video Buddy,I sold my 465 working and bought a hanteak 200 meg.I wished I would have kept my 465.To late now.73 from kn4u

[@TheRadioShop]

Thanks Ronnie

[@kevinanderson8295]

Oh I forgot, I also have one other scope it's PB - M made by Phipps and bird Incorporated, the very unique thing about this tube valve oscilloscope is that it has blue phosphor, very unique

[@andrewbarnett84]

Can I recommend CHIPQUIK for removal of such difficult devices, it allows you to use a low heat as the metal in the kit weakens the solder to a low temp alloy, running a blob of it across all 4 pins and the rectifier will just fall out. All the electronic suppliers stock it and you can get it direct if you wish. CHIPQUIK SMD1 NL smd removal kit has all the things you need, for smd parts , as well as large items as well. There is a great flux included SMD291, works like a charm. You need to remove all the alloy off the board before resoldering, and use IPA to clean up. (I have no connection to the company) I use it to clear through holes that will not clear easily as well. {ZL2ALW}

[@paublusamericanus292]

buddy made quick work of this. Really wonder about the trace.

[@TheRadioShop]

Thanks, all fixed now. Video coming.

[@denverjohnson9826]

Buddy I have a Sencor SC-61 that has an issue where the beam is just a single beam and only about 3-4 squares wide. Thinking maybe an issue with the beam finder. Looking forward to seeing the video of this scope when you do it.

[@TheRadioShop]

Any trace at all? or only when you press beam find?

[@denverjohnson9826]

Sorry I didn't see your reply until now. I did get the issue fixed. It seemed to be a loose connection with one of the molex connectors on the horizontal board. Also I did find a schematic for it so if you have need of one I can send you a copy by Dropbox.com

[@georgedennison3338]

I have a 466 I just picked up for $40.00, (1st scope). Everything seems to work fine, plus it came with a brand new leads set, and a brand new probe. The only problems I can find are the Intensity adjust is completely frozen, and the Focus adjust is nearly frozen. Since the Scale Illumination adjustment looks to be an identical knob, I assume the Inten and Focus should move as easily. Any tips on how to get these adjustments freed up? Thanks...

[@TheRadioShop]

The problem is where the shaft touches the outer bushing nut. Corrosion has built up and froze the shaft. I have in the past disassembled the control and clean it up. Takes a bit of time and patience to do.

[@georgedennison3338]

Thought it was something straight forward like that, but always good to check before I try to not break something, I mean, fix it... lol Thanks for the info

[@leoashrae4199]

Did you ever get that Fluke 8520A working? I figured the rabbit hole opened up into a cavern...

[@kardeef33317]

Beautiful scope, my family all chipped in and got me a Rigol 1054z ot says max voltage 300 volts. Is that dc or ac and is that rating with 1 to 10 probes or 1 to 1 probes? I wrote rigol several times with not 1 reply. Could you answer that for me. Iam scared to death of frying it. Any info would be helpful thanks in advance.

[@PileOfEmptyTapes]

The specs say "Analog Channel: CAT I 300 Vrms, CAT II 100 Vrms, Transient Overvoltage 1000 Vpk" Looks like using it on mains with a 1:1 probe is not recommended (except in Japan), but moderate power tube gear should work OK. Just make sure that what you're probing *always, always is galvanically isolated from mains*, employing an isolation xfmr when needed (also see EEVBlog "How not to fry your scope"). Maximum input voltage with a 10:1 probe would be = min(probe rating, scope rating * 10). So if you had a 10:1 probe rated at 1 kV DC you wouldn't have gained much, though I'd still prefer using one as it gives better bandwidth and I don't fancy having hundreds of volts on my scope inputs.

[@TheRadioShop]

Excellent reply.

[@vhfgamer]

Accidentally deleted the first comment... sorry. If you were to recommend a scope to a young college student working on his electronics technology degree, what would you suggest? I am OK with old or used gear, as long as it has all the features to cover as much general tasks as possible. Would the Tektronix 465 be a good general scope for modern and vintage circuits?

[@TheRadioShop]

The scope of my choice would be the Rigol DS1054Z or the Siglent SDS1102. If used I would be looking for something like the Tektronix 2235 since they can be had cheap. There will be a lot of opinions on this however. And yes the 465 would also be a great scope for this.

[@xConundrumx]

I mean I love the design but by god they are a royal PitA to work on.

[@rickgunther7328]

I am working on tektronix 453 with a few things bad . Wish me luck ricks radio shop

[@TheRadioShop]

Good luck Rick and let us know how it turns out.

[@billgates3699]

Wow. Elmer Fudd is real 😮

[@kalidsherefuddin]

The great

[@paul.alarner6410]

94 degrees,hope its not celcius?

[@KQ4PBL]

Would you reccomend a scope like this for CB Radio repair and old vintage repair?

[@TheRadioShop]

Most defiantly!

[@wansolve2036]

To me the biggest surprise was the 200+ volts on the +5 v bus, but you just skipped right over that in troubleshooting. The question should have been, with 9vac on the 5v bridge, where is the 200 volts coming from?

[@benjiprimes9449]

A thrift store near me is selling one, does turn on but if I buy it it would be to resell, anyone interested?

[@holgers5216]

taking a bit of a risk to inject an external 5V supply when not knowing if there is a short on the internal 5V supply!!.....got away with it this time though....still, not something I would recommend to do!

[@TheRadioShop]

No risk at all. That is why you use a current limiting power supply. If anything is wrong the volt/amp goes to zero instantly.

[@pdppanelman5889]

Just like mine..

[@TheRadioShop]

:-)

[@kennynvake4hve584]

If it was mine...and I know someone will give me S............... t bout it...I would have clipped the rectifier legs off the board..and soldered the new part right to the pins that are sticking up...

[@TheRadioShop]

Done that many times in hard to get to places. Nothing wrong with doing that at all.

[@AF6LJSue]

61HZ ....... Isolation....

[@rlmillr]

You can fix anything but a squeaky lamp :)

[@TheRadioShop]

LOL Rick. I think I have that fixed now.

[@kevinanderson8295]

I love oscilloscopes, I have eight now, 3 leader and 4 tektronix and one dedicated video waveform oscilloscope which is called a Hitachi waveform monitor

[@AF6LJSue]

That scope needs a new display.

[@TheRadioShop]

I sent it back when I first got it. Said nothing was wrong with it. Will never buy one again.

[@cwebs1000]

Hay Buddy, your power switch is loose. Carl

[@TheRadioShop]

Yep, but that is not all I have loose LOL.

[@PileOfEmptyTapes]

_Annonamous?_ :D

[@TheRadioShop]

LOL

[@XPFTP]

if u wanna donate the dso over this way.. i can give it a great home.. not much more i can say ..