HP 5061A Atomic Clock Repair

[@AsbestosMuffins]

great design, its got 2 lights, one for good, one for bad

[@lmamakos]

...and a power switch behind a closed door, operated only with a screwdriver. That tells you quite a bit, too!

[@dDAMKErkk]

its, 'ownes'?

[@dDAMKErkk]

great design, it's got 2 lights, one for good, one for bad

[@JimS-m1e]

Until the "good" light burns out.

[@AcornElectron]

People think I’m weird because I get excited to see atomic clock repair. I think they’re weird because they don’t get excited for atomic clock repairs 😂

[@hypnotised-clover]

I think you're weird, I mean, you seem to be a sentient 1980s 8 bit micro computer.

[@marria01]

Cool username.

[@tekvax01]

right?! I love atomic clocks!

[@tonerotonero1375]

I am afraid you are not alone as a weird guy. Consider I am in too.

[@SanchoPanza-n4w]

It's OK to be weird as long as you don't insist that others go out of their way to accommodate or even celebrate your ways.

[@azpcox]

Can we take a moment and truly appreciate those HP engineers and their RF black magic? And the fact it’s all relatively “easy” to troubleshoot and repair? Presuming you have a stash of original HP transistors… I love these types of videos!!!

[@DavidLightman]

and a his gigantic brain and a lifetime of experience! :), thank god it wasn't the SRD, that would be "almost" impossible to find, and even if you get one, he will have to retune the cavity, ouch!.

[@kahvikissa_]

yeah its pretty cool. i was surprised to learn how much stuff hp has made as i thought they only make computers😅

[@metatechnologist]

I came to comments to mention the level of engineering that went into this equipment. I'm not really sure that the skillset is there today - as everything is more about writing software rather than bias a transistor!

[@pe1dnn]

It is hard to believe this is the same company that makes garbage phone home subscription based printers which only leaves a bad taste. This company also produced this machine, which makes you admire HP and its engineers. Every single piece of HP equipment shown on this channel screams quality. What an odd discrepancy within one company. I also still use my HP 11C... How on earth did this company became so divided between quality and junk.

[@mansnilsson4382]

@@pe1dnn They sold the Real HP part (which became Agilent and now Keysight) and kept the Compaq part, after which they also replaced Tru64 Unix (bought with Compaq as Compaq had bought DEC before the HP merger) with HPUX. Blame HP management in the 1999-2001 timeframe.

[@martinfurtner2136]

The third physicist in the photo is Paul Ehrenfest. He was once called "the good conscience of physics" . Read up on his tragic fate if you want to.

[@macmansfield-parisi5812]

Not only a repair of an atomic clock, but a repair of a likely original factory defect in an atomic clock! Incredible!

[@TheAkashicTraveller]

I don't think he actually repaired whatever the defect is, it still had that resistor at max gain and it only barely hit minimum power.

[@dereketnyre7156]

Cool - a new CuriousMarc video! Nice way to spend a cold dark winter evening - geeking out on HP equipment :)

[@tekvax01]

Well, that was a nail-biter of a repair story! I was on a rollercoaster of emotions watching that one, Marc! I'm glad you were able to get it working again! Now you will have to try to replenish your supply of unobtainium transistors! :)

[@who_let_me_on_the_internet]

Out of curiosity, did any HP atomic-clocks have an alarm and snooze function? Asking for a friend...

[@WOFFY-qc9te]

Maybe a socket to turn on a coffee percolator.

[@CuriousMarc]

Hahaha. Would be cool if they had an option for that!

[@lmamakos]

well, we did see the alarm function in action..

[@pe1dnn]

It does have an alarm, it went off. But not the kind of alarm you are thinking off.

[@WOFFY-qc9te]

@@pe1dnn Did it warn of a disturbance in the force because Marc tuned into the Continuum !

[@JarheadCrayonEater]

As a former Calibration Tech in the Marines (1999-2007) and for Lockheed at Stennis Space Center (2004-2012), I really appreciate this one! I spent most of my time in RF/Microwave, often calibrating Rubidium and crystal oscillators against our HP Cesium oscillator. Calculating the Allan variance and predicting the aging rate out to 6 months. I even wrote the custom GPIB application to automate the process. Thanks for this!

[@tekvax01]

Thank you for your clock service! :)

[@ReneSchickbauer]

Awesome! Not many people the privilege of *setting* (part of) a countries official time. Thank you for your service! Somehow i picture you wearing a wristwatch that's also calibrated to within a few nanoseconds, just for shits and giggles 🙂

[@digitalrailroader]

It’s probably awesome watching Marc repair and “play” with the highly accurate equipment that you used in both your military and civilian careers without a second thought!

[@AmiPurple]

Courageously snatched victory from the jaws of defeat, thank you for an enjoyable video.

[@douro20]

He has TWO active hydrogen masers, one of them a vintage Sigma Tau MHM-2010 and the other a more modern Russian Kvarz Ch1-76. I'd hate to think how much the newer one cost.

[@CuriousMarc]

Even better, he got in touch with me and is helping me out. So he’s a gentleman and a scholar.

[@varno]

I am so jealous. Want to build a rubidium optical clock and femptosecond comb to compensate.

[@ChristopheD_]

Bonjour Marc. J'ai regardé sur Arte un documentaire sur la silicon valley et j'ai été surpris et ravi de te voir dedans. Depuis je sais que c'est Jean Marc!!! J'adore la chaîne, bonne continuation.

[@CuriousMarc]

For the French speaking community, this Arte KZbin series about Silicon Valley here: kzbin.info/www/bejne/nWq9fH-brq2skKM . Except for the title, it is excellently well done.

[@srOmatic]

Merci Christophe pour le tuyau ! Du coup j'ai été voir, c'est marrant de voir CuriousMarc parler français :))) Enfin... Jean-Marc donc... Dans l'épisode 2/6... Une sacrée bande de grands seigneurs... Des passionnés fondus d'idées et durs au mal. Fascinant (C) Spock.

[@PaulLoveless-Cincinnati]

Name one other person on this earth who can casually repair an ATOMIC CLOCK

[@MatthiasWelwarsky]

Tom van Baak

[@perm.jensen7722]

Probably Poul Henning Kamp

[@perm.jensen7722]

Come to think of it, i have worked with several people that could repair an atomic clock. They are more common than you might think.

[@SLeslie]

Some people driving around with atomic clocks to prove theory of relativity while others argue that the earth is flat and there is not such thing as global warming, etc.

[@lucasimark7992]

We live in marvellous times, don’t we… But let’s enjoy this marvel of engineering!

[@lor0the0fallen0angel]

Everyone needs a hobby, You know :-)

[@Luzgar]

I received 2 answers from a single guy that were deleted. (Those guys already have way too big of a platform for their science denial.)

[@chudleyflusher7132]

Blame religion. Religious people have dug in their heels against science and indeed, education altogether, in an attempt to validate their fairytales.

and those are in power, alas.

[@nigefoxx]

Stay tuned for the next episode? Both us and the clocks!

[@nerdmeister2]

it‘s about time 😅 thank you!

[@pirate0jimmy]

I serviced and calibrated HP 5061B CBC at various USAF PMEL after Lowry "Time School". Another favorite is HP 3458 opt 001 DMM. Thanks for manual link!

[@JimS-m1e]

My USAF outfit used the 5060A in the late 60's. I can't tell you why or where.

[@LaLaLand.Germany]

Mr. Curious, this is so far above my paygrade but that´s why I watch it. I gaze at Your gear and admire all the stuff I´ll never get to play with. And You make everything look so easy but that must be experience. I always have a very hard time orienting myself, matching schematic and reality. I have chosen a Grundig Schwebungssummer as project, it is a tube based frequency generator and measuring device that happens to have a sweet power stage I use to play guitar&bass thru. Now, after 50odd years the caps are shot and the tubes weak so I have a try with it. …That´s why I say You guys are way ahead of me. Happy New Year!

[@nickhuwar7920]

You make some of the best videos Marc. Kudos sir, kudos.

[@were_all_fact6026]

Marc, he's fixing the real tick-tock! Din, Dan, Don.

[@qzorn4440]

HP had some brilliant engineering. 💖 Thank you.

[@Brian-L]

This must be why all the work resurrecting the Apollo gear. Mark et al. are going to launch their own cesium references around the moon to further validate relativity.

[@fixthetempo7276]

awesome episode! very interesting! great job. Thank you! And BIG THANKS to old HP for this brilliant schematics and theory of operation

[@dDAMKErkk]

U laat zich bedienen door een 'edittor';.

[@Pathfinderxr]

Time travelling with dad on the weekend? Best dad ever apart from mine 😊

[@derkeksinator17]

Awesome Video, as always. I was very surprised that you didn't have an SMB adapter, since vintage HP gear is full of those. I've had to stop and order some at least twice now, because there are just sooo many connections done with them. Especially in the spectrum analyzers and microwave gear. One day, eager to play with an 8008A, I had the misfortune of discovering SMC connectors too. And yes, custom IC reengineering ensued, although two different ones had failed.

[@RichardFraser-y9t]

The sort of distraction I needed today.

[@Tocsin-Bang]

I love that all the "twiddly bits" are behind a locked panel!

[@misterbreakit2006]

Drop on from AvE here. Awesome channel. Subbed.

[@PaulLoveless-Cincinnati]

Also - I would appreciate an explanation of the entire stack used in this experiment. For instance, what is a distribution amplifier and why is it used in this setup? Thanks!

[@CuriousMarc]

Aha! You are ahead of me. Coming in the next video about the measurement setup. But briefly, the timers are used as dividers, and the distribution amp is used to double one of the 5 MHz clocks to 10 MHz and distribute it to the interval counter and the timers.

[@PaulLoveless-Cincinnati]

@CuriousMarc Thank you. This is absolutely fascinating content.

[@antronargaiv3283]

The jumper from your 5 MHz source to the counter at 17:07 looks very much like a segment of "classic" Ethernet coax! I have some feeding my 40m inverted vee antenna. Handy stuff.

[@624Dudley]

Astonishing! 👍

[@ComplicatedStuff]

@15:40 It did say "Caution, disconnect A4P1 before removing assembly".

[@Pamudder]

I remember reading about the 1971 experiment when its results were published.

[@CuriousMarc]

You are certified vintage!

[@Pamudder]

1955

[@Pamudder]

If my memory is correct, the experiment was covered in an article in TIME magazine, with the same photo you showed in your video. The 1971-1972 academic year was also the year I was taking high school physics with an extraordinarily gifted teacher (for which I later received 8 hours AP credit). We of course covered spectral lines and photon frequencies and electron orbits.I am sure we must have covered the experiment although all I remember specifically was learning that cesium had very closely spaced electron orbits and would produce photons in the microwave range that were being used for hyper-accurate clocks.

[@smallenginedude71]

Old hp gear is truly art. Love my 8555b. 18ghz in the 70s!

[@jameshackett9992]

Does a stronger beam current reduce the life of the big tube, did they change the transistor to increase the lifespan of the caesium tube ?

[@CuriousMarc]

No, it does not. The Cesium beam is actually neutral, and its rate is constant, only dependent on the temperature of the oven. The current comes from the electron multiplier in the detector, and is just proportional to the number of Cesium atoms you flipped. However, on earlier clocks, there was a setting to run the oven at a lower temperature to extend the life of the tube, at the expense of a less precise clock. Which is the exact opposite of what customers wanted! So on later clocks, the opposite happened. You had the option to request a high performance tube, that ran at higher temperature and had a shorter life.

[@jameshackett9992]

@CuriousMarc thks

[@christopherleubner6633]

The good old days when HP made extremely cool gear that was actually fixable. I repaired several of their single frequency helium neon lasers over the years. ❤

[@williamsquires3070]

At some point, Marc is going to have to invest in a silicon foundry so he can make replacement step recovery diodes; we just can’t keep pilfering them from other units. 😢

[@williambraeger5077]

A3 multiplier I had a similar problem with my A3 multiplier. It ended up being a bad capacitor to ground on the 30 to 90 MHz tripler. It was a long time ago, but maybe it was C 29. It was lowering the power rail voltage going to the amplifier Q5. It was replaced and the power output of my multiplier went back to normal.

[@CuriousMarc]

Thanks for the hint. I might have to take a second look at this. I checked the caps, but in-circuit. There might be a small leak developing that I missed.

[@ptonpc]

Amazing tech and repairs :)

[@NachtbrakerNL]

21:56 Someone is practicing their Hanon chops on the piano. ❤

[@TheOriginalStego]

This is the most niche comment i saw today. Love it.

[@CuriousMarc]

Good ear! It’s wifey. God I hate Hanon.

[@mikebarushok5361]

Almost to the very end I expected a bad mini coax or connector.

[@CuriousMarc]

Looking back at the video, I feel there is still one of the two in there, I need to investigate further. Bad microcoax from the multiplier maybe? It’s pretty kinked in there.

[@mikebarushok5361]

@@CuriousMarc That was based on my experience with what happens when they are kinked, twisted, pinched or stretched. Substituton is often the easiest way to verify, but looking at signal while manipulating the coax might show one end is bad in the installed position.

[@AndrewJones-tj6et]

Haha "the yellow light of distress" @3:50. When I see this HP gear I think of the quote by Dave Jones of @EEVblog , "A thing of beauty is a joy forever". Mind you I don't think he should tear one down 🙂 We had a HP revered rubidium standard in our development lab, which no one would touch back in the day. We were doing narrow band satellite coms so frequency accuracy mattered.

[@SanchoPanza-n4w]

Cool to know that HP once made mission-critical important tech and did it well. Their modern consumer division is a crying shame.

[@Quakeboy02]

I feel your pain. The tube in my Symmetricom PRS-45 aged out a few years ago.

[@itsverygreen532]

Timely!

[@jbrown468]

ISWYDT 🤣

[@pauldorman]

I still can't get over the blank stares I get when I tell people that atomic clocks are now so precise you can use them to measure changes of altitude with submillimeter accuracy. "WHY AREN'T YOU AMAZED????", I plead. Their answer is nearly always the same: "nerd"

[@andybobandy641]

Oh, how I look forward to that cymbal tap!

[@DavidLightman]

thank god it wasn't the SRD, phew!!, i was starting to get worried. even if you find one, you'll have to retune the cavity... ouch i absolutely love these videos!.

[@MikeWest_W]

What’s Marc mixing with his sanpellegrino? 17:40

[@CuriousMarc]

I drink it straight, don’t even spit out the bubbles.

[@francisbacon-moneygrabber9996]

When i was years ago in London, Greenwich, I learnt... an atomic clock is not a necessarily a 3 tons machinery. 😂 It can fit i my kitchen, next to the tupperware. 🤣 And here I see Marc, having one two three of them. 🤩🤩🤩

[@christopherleubner6633]

The rubidium atomic clock modules are very small, about the same size as a magnetic laptop hard drive and draw a couple amps at 5V. Usually have a 9 or 10 MHz output. ❤

[@rádiosantigos1958]

Hi Marc! I am following your channel with great interest (despite that I undesrstand 10% of the explanations). But it is always useful to me and I got some knowledge every time I watch it. Just to say that it will be good to us that when you are making explanations of some schematics on paper, perhaps it could be better holding a pen or pencil in front of the camera. I beg your pardon for the intrusion. Thanks.

[@CuriousMarc]

Finger too phat?

[@rádiosantigos1958]

@@CuriousMarc 🤣

[@jtelliso]

0:20 I could use a yellow light to indicate that on me...

[@chupathingy5862]

Mine would burn out after a few seconds.

[@SusanPearce_H]

Time saver!

[@lwilton]

I was looking at that and thinking that it was going to be a sizable operation just to get down to the clock where you could open it!

[@r__and__r]

Bad news! Good news!... I wouldn't differentiate at all. Mainly because I'd have no idea what I as doing be it on the microwave or digital side. Well done Sir!

[@pauliedweasel]

I played with one of these when I used to work for Hewlett Packard. Heaven help you if the beam tube ever goes bad.

[@christopherleubner6633]

If it does then that's the end of life. I did a transplant on a few of them over the years, though usually it was good modules to replace bad ones in a unit with faild subassembly but good tube. Once i even tried repairing a tube just for fun. . ❤

[@juha1to6]

daily doze of awsomeness received

[@briangoldberg4439]

Maybe you can find another one of those RF assemblies somewhere and get it a little higher?

[@MichaelEhling]

Really looking forward to your relativity experiment. How will you do it? (Surely HP and Mr Fancy Pants must have made a device to accelerate something to something like 0.42c, no? Darn.)

[@CuriousMarc]

We were thinking of the tall mountain experiment. Unless a viewer owns a jumbo jet and invites us in ;-).

[@justovision]

I would think keeping it as original as possible is important and not knowing much of anything about RF, could you insert a modern RF amplifier between the module and multiplier? Or even something different to generate the base frequency and replace that module or would impendence matching or something else make that difficult?

[@CuriousMarc]

You sure could. I thought of that as plan B, but since I managed to get it in spec anyhow, I did not have to go that route.

[@TomSherwood-z5l]

I got ahold of a fairly modern portable Rubidium standard on ebay for about 85$ and it is good enough for my use, which is a standard checking stabilized 10 MHz references in my test equipment. Yea a Cesium standard would be fun, but I have not priced them to see if it is practical, besides being bulky.

[@-r-495]

Salut Marc! Do you have surge protection installed and how did you select it? Cheers

[@laptop006]

I have two cesium's (a HP 5061, and a Datum-derived Symmetricom), both need repair, just too many projects on the pile. Plus a few nicer rubidium's that still need work. Had someone last week at linux conf au ask me if I was the one with the atomic clock, went "ehh" for a bit before someone else chimed in that they were pretty sure I had multiple.

[@baivesan]

I have a silly question. How do we know that by applying acceleration, we're not affecting the ability of the circuit to propperly compensate the frequency or the ability of the Cs atoms to switch their spin, instead of time itself?

[@TrimeshSZ]

Really you don't - but the fact that these clocks respond to both velocity and gravity in the manner predicted by relativity does create the situation where if you want to postulate some other mechanism you really need to come up with a theory that predicts the observed behaviour better than relativity does. The other factor that strongly supports the relativistic explanation is that relativity makes some rather counterintuitive predictions - but once technology had advanced to the point where they became testable were proven to be accurate.

[@gsuberland]

Everyone's heard of the PS3 Yellow Light of Death (YLoD), but have they heard of the HP 5061A Atomic Clock YLoD?

[@glitchwrks]

One day we'll find out if the physics package can get chucked in the lathe, end replaced with a conflat weld-on, and serviced :P

[@richardbrobeck2384]

I love the video !

[@timradde4328]

Who else owns an atomic clock. All step forward. No one? I know I don't. I don't even know how one works.

[@TimothyLipinski]

My best Atomic Clock is a cheap Ham Radio Quartz Clock (local and UTC Time) that is UP-dated by WWVB ! Also have a Made in China inter net clock that is up dated by the Atomic Clocks in Colorado to about 20 ms ! Also must connect to back up battery power ! T. Lipinski

[@MickOhrberg]

Do atomic clocks qualify for the PPM Tower (tm)?

[@CuriousMarc]

You bet!

[@peterbjornx]

Nice work! I'm wondering if it'd be possible to do a Caesium-beam clock from scratch in the home machine shop - plenty of cool vacuum and physics projects are being done by amateurs already. By the way, Zeeman is pronounced something like "Zehman" (the ee sound is exactly like the vowel sound you use when you say the H in HP).

[@CuriousMarc]

You sure could if you were well equipped. That’s how the first clocks were made, in a lab. However the problem is financial. It requires ultra high vacuum, and UHVAC equipment gets expensive very quickly. Also Cesium is pretty dangerous to handle.

[@peterbjornx]

​@CuriousMarc I've already got quite a large amount of high vacuum parts as my reverse engineering hobby led to buying a SEM which led to more and more high vacuum tinkering :)

[@CuriousMarc]

@@peterbjornx Sweet! Then you are all set. Go for it! Don’t forget the safety squints when handling Cesium.

[@MarcoTedaldi]

​@@CuriousMarcsince I don't think they are mass produced anywhere. So are probably still produced in a lab-like environment. Would be interesting if you could get a tour at a production facility of those.

[@danl6634]

Sounds like a good way to get various acronym agencies knocking given the cesium

[@fredrikfredrikfredrik]

Now that he's collected all the 8½ multimeters, maybe Marco Reps should start collecting atomic clocks? 🧐

[@yannickberrios]

Nice timing 😆

[@sonjakavalut]

I want one in the wrist configuration 🤗

[@Yaivenov]

Suddenly the cable I need to make from scratch for a scintillation counter seems like peanuts. XD

[@alexpinkerton7459]

Surely if you just place some tape over these warning lights, the quantum properties of the device will mean it will continue to work (well, in one universe anyway)

[@adrian_sp6def]

4:40 elevator music! Love that part

[@aquahoodjd]

And would a well-tuned helix antenna be better than a powered antenna for accuracy as I chopped one off of an old weather balloon and wired it up to a 50 ohms cable with an correct connector for the GPS module and do you think that's more accurate than the ceramic plate that's present on the module?

[@mansnilsson4382]

Not really. I'm assuming GNSS / GPS reception here. The only thing you need to care about is reception quality -- once you're over the threshold where the receiver hears enough satellites with a signal strong enough to decode properly, you're good. Then, of course, you sometimes end up having to account for jammers et c, which does mean some antenna constructions are better than others.

[@Chaosbar]

So weird hearing the standard silly kitten video soundtrack on a cesium clock repair video. 😆

[@tintruder224]

Why does what direction the aircraft flew make a difference in their timekeeping?

[@c1ph3rpunk]

Why, one is flying into tomorrow while the other is flying into yesterday, eventually they meet at today.

[@ralfbaechle]

Due to earth rotation. In the one direction the plane 's speed adds to the rotation speed, in the other it is subtracted from the rotation speed Sadly this is incompatible with flat earth models which say earth doesn't rotate 😂

[@BradBo1140]

I thought 21:10 the exact same hingl

[@BradBo1140]

@ Thanks so much!

[@tintruder224]

@ralfbaechle so this change is relative only to the point on earth where a reference clock is located? Seems BOTH would still go slower, but at a difference related to the rotation of that point on earth. Thus a reference clock at the north pole would either show equal change, or zero if their location (east or west travel) remains equidistant from the pole?

[@ivolol]

Do you know why they choose to define caesium's frequency as 9,192,631,770Hz, and not say, 9,192,631,769Hz? I wonder if you could ask Keysight if they have any 5061's whose caesium tubes have completely worn out (I say this, because in one of EEVBlog's videos in an Aussie Agilent lab, they directly mentioned that) and that you could... borrow... for parts

[@Rutherford_Inchworm_III]

Careful tinkering with quantum stuff, Marc. You might poke a hole in the space-time continuum and destroy the known universe. 🤭

[@CuriousMarc]

Oh that’s OK. I’ll just have to make a video on how I repaired the universe.

[@watomb]

That tube got to be almost done. The high performance ones don’t last that long.

[@Chiavaccio]

Great!!❤😮

[@chrissavage5966]

@27:15 as an example...every time I saw that poor coax being bent double like that made me cringe..... rotate that darn connector please!!!

[@OlivérKis-q5v]

Next video: guys the other clock failed…😂😂😂😂😂😂😂

[@CuriousMarc]

Don't laugh. That's exactly what happened! See you in the next video...

[@aquahoodjd]

Do you think that a well positioned good antenna either a helix antenna or a powered antenna for a GPS mileage module that has at least 10 8 to 10 satellite locks and gives pulse per second time marker would be as close as an atomic clock or similar and would a disaplined TXCO or OXCO be better? By the way I'm bilingual English and French speaker so when you speak with your friends in French on your channel I understand what you're speaking and I live in the French part of Switzerland for more than 17 years but now I live in the German speaking part. Sadly unlike the past most people don't speak French here and 90% prefer English which is a little sad cuz as you know French has a completely different feeling set of emotions completely different worldview when you use it so I miss using my French more often. It gives you a second world view and your culture your laws your worldview and your languenger and explicitly connected so I do look forward to learning Swiss German to add to my various worldviews. Are you still located in in France and if so do you have a museum or a place where you show off your collection? I'm super interested by the magnetic core memory modules and was interested in trying to create a thought experiment where that could be created at the micro level or the nano level and how that might be potentially introduced into either photonics or spintronics?

[@fixedguitar47]

atomic clocks are fun but I just got done rebuilding an NKVD Time Machine from the Cold War era.

[@jurjenbos228]

This device is living proof that producing 5.00000000000 MHz is a lot harder than 5 MHz.

[@jaysonpida5379]

Always funny to hear, "problem with the tube ..." in 2025.

[@CuriousMarc]

The funniest thing is that they still make the same exact Cs tube, they are $25k each, and that they can’t make them fast enough to satisfy demand!

[@Albrecht_von_Preussen]

👍🏻👍🏻👍🏻

[@mansnilsson4382]

If I follow you? Of course I do!

[@bunkermatty]

as always, CuriousMarc does things only dreamed of by the mentally insane 😝

[@PaulHenkiel]

Awake quantum monster 3:44

[@pirate0jimmy]

When you have 2 HP Cesium Beam Clocks, you have no idea what time it is. Get three, to be sure.

[@tlrptg]

everybody is in awe because of this repair. But if you look at the schematics, there are more complicated parts in today's washing machines, than in this clock. The really important things in this clock are not repairable: the cesium tube and its oven, the step recovery diode unit, probably the divider too...

[@hymermobiler]

Your own version of saving Tik ToK nice!!

[@mikekotter6463]

Эу, гдэ такые раскошные часи подрэзал, э?

[@Mwwwwwwwwe]

Now that I'm middle aged I also have problems with my atomic clock😅😂

[@auronoxe]

Did anybody else see the DSKY wrist watch advertisement during the video? Is it crazy or funny??

[@graemedavidson499]

Did Einstein have any thoughts on how time passes when watching a broken atomic clock in repair.