Ha, my father owned Electronika MK-61 when I was a little kid, and he even let me play with it! So many memories :)

So sad that the beauty of those tube displays are almost lost to time now. I know there not efficient but damn are they gorgeous.

when you first turned on the calculator after restoration i feel very happy. Thank you for this types of video. Love from India

Such A Brilliant Restoration Love from India👍

в 90х годах у меня было таких 2 штуки )) ностальгия спасибо за видео

I had this calculator when I was a radioengineering student!

This is truly awesome! I remember using this kind of Electronica calculator back in the depressive [very] early 1990s when I just went to school.

You mentioned the switch for grad and rad: they're standard calaulcator modes for specifying what "units" the angles are when doing sin/cos/tan etc. a "grad" is like a degree only there are 400 to a circle instead of 360. "rad" is for radians, where pi radians (3.14...) is the same as 180 degrees.

In contrast, in 1973 I graduated from high school, and was going to go to university, studying electrical engineering. I had a low paying summer job working at a city run day camp. All summer I saved to buy an HP-35, I was very happy that the price had dropped from $450 to $350. At the end of summer I had nearly enough, I think my father helped a bit, at least getting a bit of a discount by buying it at work (he worked for a large engineering firm) Four years later as a fresh out EE I was making $14400 a year, So I guess a new EE in 1973 would get $12,000 or $13,000., or more than $1000 a month. So in 1972 an HP-35 would cost a new engineer in the USA about 1/3 of a months pay. When I was a senior in school my HP-35 was stolen and I replaced it with a far cheaper TI calculator, which while much more cheaply manufactured had slightly more functions. It cost less than $100. Luckily the HP-35 was returned to me in a few weeks, and I have it still, and it still works. Not so with the TI calculator. It bet the TI calculator was comparable or better than the calculator featured here.

Lovely restoration. I realise I'm dredging this one up a year on, but you could quite easily restore the green plastic/acrylic screen, I think. Do the old CA glue + masking tape trick to secure it to a small wooden block then sand it back to get below the deepest scratch. Then work back up to the finest grit you can find and finish with some polywatch. It'll look like new.

Grads vs radians? 1 Grads = 0.0157 Radians

My dad had that same calculator which he bought around in 1980/1981 while he was working in The Netherlands. When I was a Kid, I used to play with that and I was very fascinated with the display until I broke it one day and I tried to fix it in secret which finally led me to my interest in electronics.

Can't be many of those around left any more. It must have been pretty rate back in the 70s if it cost two months salary. As a calculator geek myself, I love these things!

Thank you for giving these devices new life.

I loved this calculator, in fact I love old calculators, both electronic and mechanical, the electronic ones in 1st place with the LED display and in the 2nd place with the plasma display, good job sir, really beautiful calculator

I love that you're doing this. Keep it up!

Great video. Thank you for restoring this wonderful example of 197s engineering excellence.

I am so glad you did a video of this. Exquisite!

Seems to me like a USB-B would have been the best choice. It seems like it would be the perfect size and they’re extremely reliable. Pressing force might be too much though. Although I’m fairly certain I’ve seen them with mounting grooves.

I came a little when the connector slid out. Jokes aside, Soviet repairability and engineering is really something else. They just don't make things like this anymore. Even to find a schematics that beautiful is nearly impossible. Man i wish our system wasn't based on profits so that they make it as hard as possible to repair something.

Awesome restoration!!

Your channel is underrated! The editing quality and content is amazing! I can't understand why you only have 20k subs. I bet in a couple of months you'll have at least a couple 100k

What a nice piece of tech!

Those are NiCd cells. D-0,25 is the type number. Voltage is 1.2V. The manufacturer (JSC Rigel) once exported coin cells to the US but they've been under sanctions for over a decade. They even put the price of the cell on there- 53 kopeks.

Amazing! I read about these in the Tetris book "The Tetris Effect"

Display beautiful, i like

I would have kept the original power connector and made up a matching one with female ic socket pins or female Dupont pins and a body of epoxy putty.

good work, I think Grad and Rad are degree (angle) measuring unit systems

If you can find a stock of pins and female pin sockets from military-style connectors, you can build your own multi-pin connectors. In this cast you would plug on three sockets, mix up some epoxy or car filler and just cast it in there. You'd obviously need to paint on some wax or other release agent first. Maybe build a shell of sticky tape into the cavity before casting. Nice job, nice machine.

The connector looks like one used on old Kenwood amateur radios in the 1980s. Look for TR2200, TR2200G, or GX connector. They aren’t common but you do see them around at junk sales etc.

Old video but I've had some good luck making my own power plugs for odd things like that. I use the connectors you would use on a computer that attach the mainboard to the front panel led's and switches. Cutting the connector apart and trimming you can get a single connector and wire (some connectors and wires will be destroyed). If the connector and wire fit well individually on the pins, I then use scrap plastic as spacers and glue the connectors into position (tacked together with super glue). I then remove the semi-completed assembly and carefully epoxy them together and shape to fit.

12:02 "scavengers" such a correct word, needs to be used on russian youtube as well...

You can get them scratches out with buffing compound and a buffer wheel, I worked at a place that refurbished cash registers.

Great Restoration! See the Rockwell 61R; almost certainly the chip was Japanese but the remainder is locally produced

It looks very much like a clone of the Rockwell 61R calculator.

With a 3d printer, you could print your own custom fittings, for say that usb-c port and such ! :)

Very nice refurbishing! I like your channel very much. I would have had 3d printed a Russian 5V plug to keep the device in an original shape. Turning the glass was an excellent idea! If you would polish the scratches it would look nicer. Even deepest scratches are easy to remove with sandpapers and polish. But, no complaining here, just some more ideas. Thank you for your nice work and sharing.

grad and rad are "degrees" and "radians", a type of measure for angles.

I've seen you try to get scratches out of plastic in a couple videos. I've had good luck with using really low grit to really high grit sand paper. Wet sanding while using the highest grits. Then, I use a the Novus 2 and Novus 1 to complete the polishing process. Works for clear and opaque plastics. Motorcycle riders use Novus products to repair their helmet visors

В 1978г я уговорил моих родителей купить мне калькулятор Б3-18М за 200руб. Это примерно была месячная зарплата моих родителей. Калькулятор был такой же конструкции, только в металлическом корпусе. Это было чудесное изделие! In 1978, I persuaded my parents to buy me a B3-18M calculator for 200 rubles. It was about the monthly salary of my parents. The calculator was of the same design, only in a metal case. It was a wonderful product!

Scratches can be worked out of viewfinder plastic using T-Cut or PolyWatch, depending on how soft the plastic is. This goes for most viewfinder plastics. Just try a patch first and work carefully

I have an old CRAIG calculator that I found at a Goodwill. It doesn’t have the AC adapter nor any other type of power source. If I were to send it to you, could you bring it back to life just like how you did for this one? I’d pay you of course 🙂

на этой лампе можно сделать часы, удалив все внутренности, установив Arduino c повышающим DC-DC для анода лампы.

Классно!🎉

Excellent restoration and great video 👏👏👏

Fun fact, in the 80s the average monthly salary in the Soviet Union was about 135 rubles. The price of the calculator was 220 rubles

You’re amazing and I love your videos. Are you also this good with software? Can you program? You are a dangerou man 😊.

They had big pockets

❤from🇧🇩

That would've been pretty great if that could've had a USB-C port. Kinda trolly if it ended up with a lightning port. :p

How about changing the display to LCD display

That's one huge "pocket" calculator, even for 76 thats that's big right?

I *love* your videos. I got into Russian watches on eBay a while ago - I wish I had the ability to find these things!! Where do y'all source?

We can have this but we still can't have a tablet with LCARS

i have the same but i have no power adapter or batteries

I thought it was -5v did you have to change something???

хорошый апарат

I think it’s time for you to get 3D printer for this plug hole kind of problems :)

Привет, я из России. У меня где то лежит ещё один такой калькулятор в точно таком же состоянии. Не включается, но явно работающий. Вся проблема в питании, найти такое зарядное устройство очень сложно, но можно, а мне это не нужно. Если вам нужна эта вещ, то могу подарить.

It still makes me pause every time I see some old Russian product that has the price stamped into the product badge along with the part number and the serial number.

What about wireless charging!

easy why 9 was used so many times, 19.99 ; 39.99 ; 7.99

This would be kinda cool, if I were Russian. 😅

It’s so asinine that people are salvaging rare and discontinued electronics like this. Imagine the Macintosh being just a myth in 100 years due to “poaching”

I'm not worthy.

ооо,изобретения былой цивилизации (inventions of a former civilization)