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- เผยแพร่เมื่อ 21 ต.ค. 2019
- Probably the most gorgeous test gear teardown yet!
A master class in modular product design and design for servicing, a mystery retro bit of test gear from the bunker that was found in a dumpster, worth US$45k new in today's money.
Forum: www.eevblog.com/forum/blog/ee...
#DumpsterDiving #Teardown #Mystery
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That thing isn't simply an AC millivoltmeter. It is a selective level meter, also called a frequency selective voltmeter. It is essentially a laboratory-grade radio receiver with a huge input level range (microvolts to volts without overloading), and a hyper-accurately calibrated "S-meter". If you hook the input to a longwire antenna, you can use the speaker to listen to frequencies from VLF up through HF. The major use of these was in telco central offices and the like, for checking various channels of carrier (FDM) systems. You can enter a specific frequency of interest, and measure the signal level at that specific frequency, while tuning out unwanted ones. A very specialized bit of gear, but lots of fun to play around with. I have an HP 3586C, which is similar in vintage, build quality, and functionality.
This thing is a DEFINITE candidate for a repair and play around series. Manuals available free online ftb.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Wandel_and_Goltermann
@Nikki Cooper No problem.
Seconding for a repair video, its got to be a joy to repair
Like I said, a fancy-pancy millivoltmeter :-P
Amazing how defensive some people get over esoteric instruments hardly anyone would ever have a need to recognize, let alone have a use for them. After all...
it's just a millivoltmeter.
@@tiny_toilet every RF measurement stuff is a millivoltmeter in some way or another :)
There is some dude in a old age retirement home in Germany who's forgotten his wife's name but can recite the calibration manual entirely.
Guaranteed!
Probably because he spent more time working on it than with his wife.
Heck...I am only 55 & I can do that!
@@russellhltn1396 heyoo!
David Brewer even with only half a brain still working he could still calibrate this thing perfectly
Vorverstärker = pre amplifier
ZF-Verstärker = intermediate frequency amp
Gleichrichter = Rectifier
Phasenjitterschaltung = phase jitter circuit
ADU Schaltung = Analog Digital converter
Trennstufe = separating stage
Umsetzer HF = High freq converter
25 MHz Tiefpass Entzerrer = 25 MHz low pass equalizer
Vorteiler = prescaler
Nachteiler = postscaler
Rastphasenmesser = Phase lock detector
Rastoszillator = phase lock oscillator
TTL Stufe = TTL stage
Interpol phasenmesser = interpolation phase detector
Normalfrequenz teiler = frequency divider
Trägerphasenm(odulator) = carrier phase modulator
Träger = carrier
Vervierfacher = Quadrupler? Quad Multiplier?
:D Frag mich was die sich dabei gedacht haben das alles Deutsch zu beschriften :D
Deutsche ingenieure halt 😂
Vorverstärker = Velociraptor; Dave Jones 2019
Here is the list for anyone who wants to translate and hear the pronunciation in sequence.
Vorverstärker ...
ZF-Verstärker ...
Gleichrichter ...
Phasenjitterschaltung ...
ADU Schaltung ...
Trennstufe ...
Umsetzer HF ...
25 MHz Tiefpass Entzerrer ...
Vorteiler ...
Nachteiler ...
Rastphasenmesser ...
Rastoszillator ...
TTL Stufe ...
Interpol phasenmesser ...
Normalfrequenz teiler ...
Trägerphasenm(odulator) ...
Träger ...
Dave you should definitely repair this beauty of an instrument! I think it deserves to repaired at least.
Like if you also want Dave to repair this baby!
To what end? If anything, it deserves to be thrown up on eBay for 99c NR starting bid for someone who either wants to fix and use themselves or part it out. Why would Dave want to waste his time on something he'll never have a use for?
@@tiny_toilet for TH-cam purposes of course. We all want to see it working
Good luck with that. Where the hell do you start? There is *_SO_* much stuff. If the power supply works ok, then where do you go from there. Any one of those modules could have a failed component that causes it to not work. But i suspect it IS the power supply. Thou shall check voltages.
Can't imagine how much more equipment of this caliber has actually ended up in the dump! Gotta save it.
*walks past the studio door*
*hears* "IT'S HINGED ITS HINGED GOD THAT'S PORNOGRAPHIC"
*pauses. Continues to walk, faster*
... and everyone knows the Germans make the best porn. lol
that needs to become a T-Shirt!
Most underrated comment of the day
🤣🤣🤣
"penetration as far as the eye can see, isn't it glorious?"
This thing needs to be repaired and tested. Bring it back to life.
It's just not worth Dave's time to repair it.
I would watch that in a second!
You'd think it was also not worth his time to pull it to bits then put it back together, but here we are.
He should donate it to Mr Carlsons lab if he doesnt want to fix it himself
@@timrb Apples and oranges...
Not a single cubic micrometer wasted! And just enough space for each strand of copper... Simply amazing.
Dave, this unit was released 1980 for a price of 34650 DM. The todays value would be 126740 AUD. Regards Jürgen
$93K USD - sounds about right
That truly is a stunning example of both electronic and mechanical engineering, the layout, machining, everything had so much thought put into it.
That thing needs to be put in a museum. Absolutely beautiful work!
Seems more lucrative to be an Australian dumpster diver than an American engineer.
Or European engineer.
Sad, but true.
Australia must have some fabulous dumpsters. Our dumpsters here in Annapolis just contain trash.
The trick is having access to the right dumpsters (that others don't have access to)
I think Dave might need to change his underwear after this one.
Never seen that much penetration in an eevblog video...
I know I do! One of the most impressive pieces of test equipment I've ever seen.
god, I only hope, it's hinged!
"it just oozes quality" ... wipe the bench when you're finished, mate.
cehfully collect all the quality and put it in an airtoight containah, thin put it in tha fridge to keep it fresh
One of the best EEVblogs ever. Gone is the critical and cynical Dave - here we have the real deal - a man that, when presented with a piece of incredible precision engineering, can be transformed into a kid on Christmas morning. Just inspiring - thanks Dave.
I take my hat off to the team who designed this thing pre CAD! It's hard enough today getting everything to fit together properly in that sort of tight envelope, but pre CAD it must have taken a herculean effort (and probably a LOT of prototypes....)
Please Dave!!! This is NOT "just a milivoltmeter"....!!! this is an adjustable bandpass voltmeter so you can adjust for a frequency and measure the amplitude up to 25MHz. You can measure 3rd harmonic distortion on your LF/HF generator fx. at 1kHz then you adjust for 3kHz and measure the voltage at the desired bandwidth. Can also be used as SSB receiver.
Please Dave, DO NOT CONSIDER THIS AS "just a milivoltmeter"... this is MUCH more than that. Please !! is is a measuring receiver, very high quality measuring receiver. Please read the basic stuff about the equipment in the manual before you make a teardown, just so you know what you are dealing with here..
"Please Dave!!! This is NOT "just a milivoltmeter"....!!! this is an adjustable bandpass voltmeter"
Yep, exactly as I said, a fancy-pancy millivoltmeter :-P
If you actually watched the video you'll hear me say essentially that.
no u
@@EEVblog Nope, and yes I watched the video. You have no idea what it is, you should explain in details WHAT it is and what it can do! It has X/Y plotter output and can be used to draw filtercurves also. Is is NOT just a "fancy-pancy millivoltmeter".... it is a selective receiver! and you are comparing it to a standard broadband UNI-T milivoltmeter....!!!! IT IS NOT THE SAME INSTRUMENT!!!!!
THe standard of the EEVblog videos are really on the way down..... it is getting more and more terrible, the quality is bad and it is made in a hurry. It is such a shame!
@@peterandersen4676 This is very limited compared to say an old IFR-1500S. I suppose it is all in where your head is at.
So, next video repairing the power supply? To see this puppy alive again?
Exactly! Let's see this beast alive!
Let’s use Prof. Carson’s Vedolyzer to fix what is undoubtedly going to be a switching power supply.
Masterclass indeed. You should put the call out to see if any of the original design team are still around and see if you can get some comments from them. That would be a must watch, no question. This is a seriously stunning piece of system design.
"Penetration as far as the eyes can see!" - Dave 2019
What a legacy.
Modern tech designers could learn so much from this. ❤️
Simon Hopkins sadly, modern tech designers won’t have that amount of engineering hours to put into one product. Maybe people spend this amount of time for research and prototype, but product development never again will have room for that amount of over engineering. Not even that Silicon Valley juice press came close.
@@Krmpfpks I meant learn from it in its serviceability and upgradeable nature. We can't keep manufacturing throw away technologies. You go to any dump or recycling centre and look at TV's most of them are thrown away because 1 component failed the rest of the unit is fine. They need to be modular and standardised.
I have no use for something like this, but if I had it, I would gladly sink days into troubleshooting and repairing it as my own little tribute to the engineers that created this beauty.
having been trained in this era ...i'm having visions of offices of guys at drawing boards drawing paper drawings for the design of this pre CAD design era porn device
"All the RF guys will say 'aghhh 25MHz, that's DC!'"
I feel personally attacked 😂
I sure hope that some of the original designers of this marvel of product design are still alive and can see and understand this video. All the hats off to the team, this is some of the most amazing product design jobs I've ever seen! The cans, the modules, the HINGES, the die cast sides.
I'll need to clean my desk now...
Send it to Mr Carlson for re-capping
indeed!
it would be great to get a video of Mr Carlson about this and i think he would love to have it too
@@user-ov5iu9ze6v That's just mean. It would be 19, 2-hour videos. His head would explode.
Then we could have XrayTony align it!
@@garynichols1502 Glad to see we all watch the same stuff :)
Yes! I would pay the postage!
Who knew industrial design could get to this level! Staggering work from our German friends and a great teardown video Dave.
30 minuts of "LOOK AT THE CANS! LOOK AT THE CANS!"
i love it
"Wostacker" -Dave L. Jones 2019,
Attempting to German & Pronounce Vorverstärker.
(Which btw is a Preamplifier)
You shoul teach him the pronunciation, ie V is F, W is V, umlaut add a r sound so Ö is Er.
For me it sounded more like Wurstacker.
"forfersteerker"
preamplifier*. English doesn’t capitalize nouns except ‘proper names’.
Greg Ewing *forfirstærker. “ee” is a long ē vowel sound, ä is a forced short vowel sound.
Imagine using that meter just to test continuity that's why the speaker is there.😄😄
@Erotikstudio Winkler GmbH it will also mean there will be many more failure points.
Tomasz Wota that’s easy for us Germans. We just figure out all the possible failure points and then we overengineer some more. ;-)
This is finest stuff from the 90´s. The latest datecode I found on the TTL was 98. I worked with W&G HDB3 fiber transmitter and receiver in 1992. At this time you could buy 1-2 nice new cars instead of equipment like this.
A 98 datecode? Weird, to have something like that among all those 82 and 83 datecodes. Maybe a repair?
You have to repair it, please.
The schematics are available and the digital part doesn't turn on. Could be an easy fix.
I think you missed a whole bunch of silver cans on the underside when you folded the panel out on the bottom. You show them all at 26:15 but we never get to see under them.
Oops, really?
@@EEVblog I think so as well!
Yup, that is exactly what I was about to write. :-)
Its got 4 layers of cans in it, fold out section at the bottom, fixed layer in the middle, then the fold out section with all the logic on at the top, finest German engineering there.
Yep
yeah yeah.... "a millivoltmeter"? That's not even nearly a millivoltmeter but in fact is a measuring receiver - kind of spectrum analyzer where you get an calibrated readout of the signal voltage at *exactly* the specific frequency you tuned in. And even if one might use the instrument in fact to hear some AM modulated SW radio stations it's intended use is to identify the source of any "signal" on a measured object, line or whatever. An experienced operator could determine from the sound of the hum or noise if it is some wanted signal, some hum from any power source being coupled in, some radio interference from a nearby situated radio station or whatever.
In the hands of a well trained person this beast could be a real sharp knife to analyze and eliminate unwanted interferences. For Joe Blow it would be only some overrated millivoltmeter that does not even have some working beeper for continuity tests or a transistor tester...
Your velociraptor (Vervierfacher) at 24:50 is a quadrupler. And we Germans *love* our flathead screws, you'll find them anywhere. None of that new-fangled Phillips stuff!
Philips screws were invented for high speed automatic installation, designed to cam out when they get enough torque. They're fairly nasty. I much prefer hex head, Torx, square drive, etc.
@@johnrehwinkel7241 I know it's hard to see, but my tongue was very much in cheek for that comment :D I also noticed there were some (but few) Phillips screws in there as well.
Dave, can you do an episode about signal transformer design? Like how they manage to get 50hz - 25mhz through that input transformer with good linearity??
Maybe you know someone to interview about the subject??
About 20 years ago, back when I was living in Brazil, fresh out of what would be called TAFE in Australia, with my humble Diploma in Electronics I went to work at Ericsson Telecom in their metrology lab and my work was to test and calibrate those WG instruments. I felt a bit of nostalgia watching this video, because sometimes we needed to open up these beasts to measure levels and frequencies of the internal modules... They really are beautifully designed.
German viewer here! Mainly just a forum user on the Thermal Camera section. Will get into EE eventually... To get the thermal cameras working. I started a university course that isn't EE just a few weeks ago.
I swear I had my clothes on when I started watching this video.
What frequency were you operating at?
Alright, this is getting weird....
It’s that through hole modular construction which made exposure of the cans so extremely likely.
@@mrcomment5544 I guess he was sweeping.
oh "boat anchor" I always thought you were saying "Bo Dangker" like it was some Australian slang.
Me bo dangker mate. Good on ya.
LOL
This reminds me of when I found a German TV back in the early 90's. It was modular in design and had all the pcbs in individual card edge connector slots. And shielded to the hilt. Great engineering and design.
And this is why dumpster diving in the industrial park is a good idea.
It's fun to see (in the reflection of the shiny cans) Dave gesturing behind the camera while talking. I assume he just does that all the time even if nobody can see :)
From original german brochure:
Messgeräte für Spannungen und Pegel (TF-Bereich)
Bezeichnung BN Jahr Preis*)
Selektivem Pegelmesser SPM-19 from 1980 34.650 DM
(if i did this correctly) 1USD ~ 1.82 DM in 1980 and 1USD (1980) ~ 3 USD (2019) so in current
USD this thing would cost approx. (34650/1.82)*3 = $57,115. Thanks for posting this!
@11:50 : "I could spend an hour long video analyzing the subsections"
I'd watch that. It would be awesome.
I think more like 2 hours. Count me in Dave!
Had the same reaction when I disassembled a dumpster found Apple G5 Tower. So much genius, thoughtfulness and ingenious fabrication technics!
seeing that thing work would be amazing
Startup (with CRT unit): th-cam.com/video/TN6BhmxvkK4/w-d-xo.html
Using it: th-cam.com/video/vTdAHDgJs74/w-d-xo.html
Using it: th-cam.com/video/0NvAtVBE3ZI/w-d-xo.html
Using it: th-cam.com/video/8RdQSOtsiqU/w-d-xo.html
Using it (with CRT): th-cam.com/video/aRACCfivQP4/w-d-xo.html
Using it (with CRT): th-cam.com/video/9aVKs4N7vvY/w-d-xo.html
The reason it's designed so modular might stem from the philosophy in the 70s in Germany that devices had to be repairable.
Companies were actually investing a lot of money into a dense service network and advertised their quick turnaround times when their devices had to be repaired (that's WHEN, not IF!).
According to my dad, a transistorized TV had to be serviced at least twice in its first year of operation.
Japanese manufacturers at first had a really hard time to come into the market because people were afraid they wouldn't be able to have their devices repaired. Took quite a while until they realized that those devices just didn't require maintenance. :D
German manufacturers started their downfall right then and there.
That being said, now it's time to show how easy this modular construction actually makes repairing and servicing it and get it back to life. :D
What an amazing bit a test equipment!! Back to the days of drawing tables and pride in your trade,,,, just amazing!!
My guess for the plastic covers is that they are /all/ injection molded plastic, some are just metal(chrome) coated. They just didn't plate the ones that didn't need shielding and instead it's a dust cover.
If only "modern" instrumentation was built like this. Obviously built to be both "serviced", and "maintained" (calibrated). There are LOTS of adjustments to make this a world class instrument that has accuracy that is second to none. I suspect that a maintenance on this item would take a day of strict reading of a manual and a tweaking screwdriver to get it all set up. What a box!
You can see why I like repairing on this era of equipment.
Me too now I don't even bother opening the shit.
For the first time, I got almost as excited as Dave - a masterpiece of design......
When working in power stations back in the 80s, we just loved that W&G shielding.
Would be nice if you do a PSU tear-down video in the near future on this instrument. It would more than likely that it would be overbuilt like the rest of the unit... Great tear-down Dave 10/10
A genuine top 3 teardown, I can barely contain myself, sheer joy! they don't make 'em like that anymore.
That modular construction reminds me a lot of the radio equipment I worked on in the Navy in the early 90s.
German navy, no doubt.
@@simontay4851 Nope, US Navy.
I'm not German, but most of those things are more or less guessable for a Dutchman:
Verstarker = amplifier (versterker in Dutch)
Vorverstarker = preamplifier (voorversterker in Dutch)
ZF-Verstarker = medium frequency amplifier (MF-versterker in Dutch)
Umsetzer HF = high frequency converter (converter in Dutch, but "omzetter" literally translated gives converter)
Gleichrichter = rectifier (gelijkrichter in Dutch)
Frequenz teiler = frequency divider (frequentie deler in Dutch)
Phasenjitterschaltung = phase and jitter circuit (phase en jitter schakeling in Dutch)
Trager = carrier (drager in Dutch)
Stufe = stage (trap in Dutch; the only German word in this video that looks more like English than Dutch)
Btw, I always thought Rohde & Schwarz stood for skillful engineering, but this beast is on a higher level.
Guy 1 with test gear acquisition syndrome: "Do you like Rohde & Schwarz or Wandel & Goltermann more?"
...
Guy 2 with test gear acquisition syndrome: "Yes."
Love your enthousiasm, it's contageous! keep on making more awesome content! Greetings from the Netherlands
Thumbnail quite should have been "My god, it's full of cans!" :P
So very satisfying. Inspirational too. Suddenly I find myself wanting to build little isolation boxes for my eurorack.
Makes the Eurorack modules look shabby! 😂 Love the Subtractive synths. None of that FM rubbish tnx!
I would love to see a MTBF calculation to MIL spec for this thing.
Must be like 10^9 FIT :D
Thank you. That is a master piece of German electrical engineering.
This needs to be a repair video. Or series of repair videos. I don't care if it's nineteen 3-hour videos. I'll watch every one of them. So much to learn here....
The most amazing engineering I've ever seen!
At 9:55 - where do you see "2 Caps for redundancy" there? I only see 2 DIODES (!) there. The only Cap being shown in that situation is the green 400V one in the upper left edge and I bet these diodes in parallel are not "for redundacy" but merely for current capabilities improvement.
Dave Jones officially breaks his high pitch excited voice record lol
I have an ANT-20 Advanced Network Tester, by Wandel & Goltermann. It's amazing on the inside, the engineering they put into their instruments is their trademark.
check the switch, maybe its just the switch
The meter needle moved so it must be getting power.
@@EEVblog ah ok, yes i saw that. 😪 i guess "not a bobby dazzler"
@@EEVblog Thou shall check voltages!! Come-on, you know you want to!
Better made then any modern gear
That is a piece of GORGEOUS ELECTRONIC ENGINERING !!!!!!!
i'd love to see a 3hr video on repairing and complete theory from the signal path on this thing!, complete with experiments and all that!
I needed a Smoke after watching this !
That is absolutely gorgeous piece of engineering.
Warning stickers are all next to ground screws.
Ive got an voice announcer 'Ansagegerät' from Wandel und Goltermann. Nice thing 😅
One of my preferred video! Thanks a lot Dave for the the joy you gave me, and it's not only because of the teardown. Greetings from Switzerland.
Great find!
i was actually surprised that it only had a tcxo and not an ocxo, given that this thing was just dripping with quality, and given how much it had to have sold for new.
loved the clarke quote from the book 2001!
Yes Dave, the framing always keeps me coming back for more... :D
I knew it!
Imagine what we could accomplish if manufacturers designed and built with this kind of quality today.
it would be unbelivible but it would cost a huge amount of money
@@DavidKrautscheid Unfortunately true. And both the lack of quality and the would-be cost route back to the same ultimate problem ... greed. =(
@@DavidKrautscheid Lots of military gear is built like this but isnt as 'pretty'. Usually cost is not a factor when its a sat-com radio or a piece of crypto gear.
@@68pishta68 thats wrong. if i would have build something like this wandel and goltermann in todays times it would cost you 30000 dollar and i think not that you can pay this
21:47 "Penetration as far as the eye can see." Ok.
Fix the broken power switch. Holy cow, it's a trivial mechanical fault. Bypass it. Make it light up! Lol. Nice piece of kit.
German workmanship: So robust and precise that the device would survive transport to Mars! At minute 23:14: '..Master class in design..". Yes!
I always refer to my Sencore equipment pull out menus. They don't fallout like yours, but unfold into several pages.
I worked extensively with W&G SLMS sets at STC (Standard Telephones & Cables) in the UK back in the late 80s. This stuff really is amazing well made & amazingly expensive.
Wow, that is like some sci-fi stuff there.
metallitech as long as it’s not functional, the *_fiction will alias for steampunk.
Have fun ReCapping that Puppy.
I wish you could have as much fun as an engineer making this today
I did a teardown video of this one 3 years ago. I think it was BEB #1 or so ... Usually you pull-out the complete mainframe once you have removed the top plate cover. The mainframe is not screwed down. It' s just sitting in the aluminium enclosure, in rails. W&G built some more fascinating stuff, which I videotaped.
Ing. Max Koschuh's video teardown:
th-cam.com/video/qXJRYAD8Ung/w-d-xo.html
That was a solid tear down Dave nice job
I have an old Wandel & Goltermann catalogue, it's a hardcover book that doesn't have list prices so I guess they were not cheap xD
You could also purchase a PS-19 level generator which could be used together with the SPM-19. W&G build a number of selective level meters but they are hard to find because they are still very useful and thus valuable since simular instruments are no longer build.
Would love to see a repair video of this.
From the 'secret' dumpster... I remember locating that place from the video and Google streetview, nice challenge.
Far out tear down. I'm impressed. More vids Dave.
Use these meters about 26 years ago on a daily basis testing transmission open wire routes for telcoms in South Africa.
That is a really nice vintage kit. The quality made me leak fluids. It gave me some good ideas as well.
Ive still got three of these in use! Two of them I repaired back to working condition only last year.