Tesla was able to make almost any device you could think of back then :).

@@DiodeGoneWildl

Wow Is like new!

I have never found a person so prepared. For me, every video is a lesson.

PS is this capacitor restoration process done one at a time, or just the whole device voltage slowly being raised? I'm assuming its one at a time?

I also like my clocks :). I have several of them. I'm also about to get a very nice German Mauthe quarter striking clock and I may show it in a video...

Agree. It's super cute.

Yeah tear her apart. Let's see how she works xD haha just kidding I'm a cat lover ❤

i agree. very beautiful cat. And always make his guests appearances in the videos... :) so cute!

I hope she doesnt get playful one day and connect with a "MAINS" bare wire he leaves lying around

Yes, it's a shame that Tesla went bankrupt because of a cheap chinese import. Tesla products may have been lagging behind some western products of the same era, but they were designed very well. Designed to last and to be repairable.

I buy it in auctions or in internet classifieds. Occasionally I also go to an antique shop.

DiodeGoneWild what is max price I should pay for a anolog osiloscope

For a 2-channel 10 or 20 MHz analog oscilloscope, I probably wouldn't pay more than about 40 USD in case it comes with no guarantee, or about 80 USD if it is tested and 100% working. For something better like 50 - 100 MHz maybe 100 USD, but not more.

Thanks :)

Manufacturers usually copy one another. It's much easier than going through the ordeal of designing something from the very beginning. It's often usefull to take a look at competitor's products :). It may prevent you from reinventing a wheel. And if you have to reinvent a wheel, at least it shouldn't be a square one :).

The cat is my safety officer :). She often has to be locked out not to see the things that are happening on my bench :D.

Kočka motajíce se po stole zrovna když zkoušíš MOT či IHVT nemusí být dpbrá nápad xd

No to právě tu kočku vystrčim za dveře :).

If the marks are silver, it's good, there's a vacuum. It they are white, it's bad :). In electrostatic CRT, the flyback is not really a pulse, it's a slope. This CRT is one of the simplest ones. The color CRT's from high resolution computer monitors were way more complex :).

Very true, and the Sony Trinitron CRT which was the best, used an aperture-grille instead of a shadow mask. I replaced a 45" Trinitron CRT once in the PVM-4300, it took 4 men.

45 inch CRT! Bloody hell. That's f-ing huge! I never knew there were such large CRT TVs.

Not surprised it took 4 men to lift! Must've weighed at least 100KG!

TV weight was 200kg 440lbs, CRT must have been 150kg, was the biggest CRT made $40,000 US. docs.sony.com/release/PVM4300.PDF

Analog scopes can't work properly without CRT shielding. Not really. Electrostatic deflection CRT's are very sensitive to interference and even its own transformer would magnetiacally distort the beam horribly. ... You can make a scope with a very few tubes. Just one pentode is necessary for the time base and some tube is needed for the Y amplifier. There are 2 for more sensitivity, but even 1 would be enough for most measurements. So you can have a scope with just 2 tubes.

Mine had some hum pickup from the transformer, which I put down to the transformer having had to be rewound. My bodged up shielding didn't look very pretty but it roughly halved the amount of hum pickup so it was usable. It lasted me many years that 'scope, and I eventually sold it, still working. The Heathkit had a very large CRT, and perhaps this made it just a little less sensitive to magnetic pickup so they decided it could be dispensed with. Like the Tesla it had a rectifier valve, and also a selenium rectifier. It was dated 1964, I sold it around 1995. Perhaps I should have kept it.

Even 2 tubes can be enough for a scope. One pentode as a time base oscillator and one tube as a vertical amplifier. I think this one is from late 1960's. I have found some scanned manual that was printed in 1968. I also like how simple the vacuum tube devices were. Tubes were big, expensive, drew a lot of power, had some failure rate and so on.... this forced the designers to make the devices as simple as possible. Nowadays, nothing motivates us to design things a simple way. There are 110V + 110V + 10V primaries. They are 2x 110v in parallel and 10v in series with them for 120V mains. For 220V mains you have 110 + 110 primaries in series and the 10V primary is not used. But the hidden position of the switch can put the 10V primary in series with the two series 110V primaries. This is probably possible just by a chance. Analog scope has no sampling rate :).

Yes, sample rate is probably the wrong word here but a max. frequency or smallest timescale. I really like how solid these scopes were made long time ago. I would bet the modern DSO's wouldn't last that long. But the functionality cannot be compared to the old ones. This red-brown thing that you can see at 8:50 in the bottom left corner is probably a paper-metalfilm capacitor. They tend to go dodgy as well after long time because the paper get acetic. Maybe you should replace it.

There's a lot of paper capacitors in it, but surprisingly they don't fail. It was probably kept in a dry place. The max. frequency (the bandwidth) of this one is 5MHz. I don't know the maximum refresh rate (sweep rate), but it may be few hundred kHz. In a DSO, tons of electrolytic capacitors are probably gonna be dry after 5 or 10 years :). Or maybe some software counter may disable it to make you buy a new one.

@@DiodeGoneWild Weird, in the western world we already had styroflex caps everywhere by the mid 60s.

Yes, it's just to see the waveform, not to measure the voltage and time. It even has a time base potentiometer, so you can tune the time base linearly. This makes time measurements impossible. And also the amplification of the tubes varies over time, so it can't have a screen really calibrated in volts. This piece is really quite clean, it was probably kept in a dry clean place. It's up to 5MHz. It has paint on all solder joints probably to see if someone was soldering in it...

Probably.

Before about 1950's, there were no solid state diodes at all. Then, first diodes were made, but they were suitable only for low currents and low voltages. And also they were expesive at the beginning. So for another few decades, vacuum diodes were still in use.

I'm trying to find a cable with the original connector instead of modifying it.

That's ok. It's more like a functioning museum piece and not a work tool.

no, try to keep it as original, if possible....

its still perfectly practical even if single channel, depends what you want to inspect with it, i have a dual channel 'scope but never yet needed to use both channels...

I have Tesla "Popular" and "Tosca" :)

Not nice.. get your mind out of the gutter ;-) Dany that's "foe cuss"

no offence intended... but I had kids around and they asked me what he just said.

Matyho videa and he is from czech republic...

Made in CZECHOSLOVAKIA

Petr Brazda i know :), but he probably don't

Já sem taky cz

i love Czech Tesla stuff, also Polish Unitra 😊

Lissajous curves But the oscillators he used are not very sinusoidal, so the pattern looks quite dodgy

@@weinihao3632 Thank you so much!

I also don't like it. I have to find some matching connector for the mains input.

Or properly replace the mains input connector with a modern IEC 3 pin socket/plug.

Thats a good idea

@@simontay4851 I would never change it... It's just made with it and it's nice looking steel, no plastic sh*t. I use it with original matching cable.

Well, it has a similar outside shape, but the pins are almost certainly wrong, as that IEC standard didn't exist back then. It WOULD be safer to replace that socket with a modern IEC connector and add a ground to the steel case (that thing predates equipment grounding requirements) but being an antique, decisions have to be made with regards to making safety upgrades vs. preserving the authenticity of it. Since he's an electrical engineer who can inspect the scope for potential live shorts, and likely isn't planning to regularly use this thing, it's better to lean toward preservation and try to find a matching cord. The same kind of decisions have to be made when restoring a car- do you upgrade the lighting to modern standards? Add mechanical turn signals? Add seat belts? All of these are relatively easy to do, but not easy to un-do without leaving evidence, and may affect the value of it.

You will need more transistors than tubes: These tubes are Pentodes, meaning they have 3 "Grids" each. You can apply a different voltage signal to each grid which will then change the output of that tube. Transistors only take a single signal input, so you need multiple transistors to get the same functionality.

It's likely not a deliberate setting. Back then, the places this scope would have been used would have had 2 voltages- 220v and 120v. 120 (nominally 127v) was common in eastern bloc countries. In order to make this work with the two different voltages, the input transformer has 3 different primary windings, 2 @110v and 1 @ 10v. Different combinations in series get the different inputs. The design of the switch makes it so that there's a position where all of the primaries are in series, which adds up to 230v. It's a happy coincidence of the way they implemented the dual voltage function that that ended up being the standardized voltage used in Europe today. There's probably also positions in that switch that would set it for 110v in and 10v in. It would probably be fine for him to use it on the 220v setting, as all mains voltage standards are nominal and can vary by up to 10% or more in either direction (for example, mains voltage on the US is nominally 120v. I'm the early days before standardization, some places supplied voltages as low as 110 and as high as 125. Most equipment was made to work with the entire range, so when they standardized it, the standard chosen was 120v with a tolerance of 10%, which made it possible for power plants to keep old equipment until it wore out, instead of needing to change everything.) Since the design of of this scope allows for an unintentional 230v setting, and the transformer is old and fragile, it's a good idea to take advantage of that to reduce the stress on the primary windings.

Jaký motor?

Ten bude nejspíš komutátorovej. elektrika.cz/obr/08_principstejnostimotoru_01v.jpg

Já myslím, že pro začátečníky je dobrej skoro každej osciloskop :). Ale lepší je, když není moc velkej a nemá zbytečně moc ovládacích prvků. Pěknej osciloskop je třeba ten C1-118 co mám. Ty Tesly jsou taky dobrý, maj asi i větší šířku pásma, ale 3,8kg vs. 17kg je fakt rozdíl :D.

DiodeGoneWild Moje 4333A Color Oravan je těžší a to nemá takovou úhlopříčku

lisážus curves, nebo nějak takhle si to říkal

Lissajousovy obrazce sem ukazoval na konci... i když takový ne úplně klasický. Správně na ně má bejt sinusovka, ne pila :).

DiodeGoneWild aha díky xd já ty konce vždycky nějak vynechám, zajímavý.

Proto tomu také skvěle rozumím. :-)

@@honzajochman4639 Tak to pak mohl namluvit rovnou česky, to byste rozuměl také skvěle, akorát cizinci spadnou smíchy ;-)

No worries, more videos are coming ;).

DiodeGoneWild thank you you are my favorite channel:)

please look again at the movie and you will see where it was wrong, sincerely.

I don’t see anything wrong about tightening up a loose potentiometer.

You're right, but he's using the wrong screwdriver, that screwdriver is for testing the presence of voltage not for mechanical things. I think it is a minor thing that can be corrected. Anyway, I really appreciate what he does DiodeGoneWild.