EEVblog

[@lightguy250]

I think the mirror on the PCB holder is so you can see the bottom of the board without having to completely flip the entire thing.

[@MartinPHE]

I'm thinking the same thing.

[@sensepeek]

Yes you are right the mirror polish is extremely useful but we are considering having one side mate polished so that you can choose by preference.

[@eimparas]

me to

[@hecatommyriagon655]

Yeah, I think that's pretty obviously why it's "mirror like", baffles me that Dave missed that. ^_^

[@Zetex2000]

The disadvantages is that you have to clean the mirror every time.

[@Henchman1977]

I think this format is a good balance of speed and detail!

[@SuperAWaC]

those rca tubes were for us military applications, hence the compliance, and the packaging

[@brycemw]

I think that the "Warning may contain Internet" is from a numberphile video where they unboxed something that said "Warning may contain numbers".

[@EEVblog]

Oh, ok.

[@jackm_]

a link should be in order D:

[@oskimac]

It reminds me of the It Crowd "the internet"

[@elvee88]

Sounds like the calculator unboxings.

[@aljowen]

Presumably the mirror finish is so you can see both sides of the board easily.

[@sillyfly9530]

My thought exactly

[@galileo_rs]

Ham radio licence etc: For most of the people (these days anyway), the reason to get a licence is to be able to (legally) experiment with RF transmissions. I got my licence when I got the rtlsdr and when I learned about WSPR. There is something appealing (at least to me) in transmitting a 0.5W signal and getting that signal decoded a 1000 km away. Also lots of other interesting things to experiment with. So in a nutshell: experimentation with RF.

[@AureliusR]

I don't think that's true. The majority of people who get their licences use it to communicate on the ham bands, not to do RF experimentation.

[@galileo_rs]

In the old days yes. These days if you want to talk to strangers across the world you use the internet. Most of the young hams that I know are electronics enthusiast who want to experiment. Of course there are exceptions: usually in the weirdo and socially inept category for some reason, and kids whose parents are already radio amateurs.

[@AureliusR]

Dragan Milivojević Uhh... I've been an amateur operator for over two years now, and I can state from experience that what you're saying is categorically untrue, at least in North American, I don't know about where you live. I've met more people, young and old, through radio in the last two years than online.

[@galileo_rs]

Maybe a cultural difference? When I talk to people about the hobby most ask (the obvious question) why would you bother when there is internet. Then I have to explain all that I stated previously, most people start to understand, some even join the club.

[@raccoonnyc]

There is no reason to get a ham license except for the expectation of fun.

[@bytesabre]

I want a clock made out of those flippy dot things now, just to be more hipster than the folk with Nixie tube ones...

[@bytesabre]

There is no way a hack tool recommended by a spam KZbin comment isn’t going to do bad things to the person that tries to use it. GTFO

[@4BoltClevo]

The reflecting surface would be good on that board holder to power up prototypes with the thermal imager looking at both the top and bottom at the same time. Could be handy...

[@SatyajitRoy2048]

Mirror finished PCByte is good because you can see the underneath of the PCB quite easily.

[@deltoid77-nick]

I agree

[@joedempseysr.3376]

The 6AQ5A vacuum tube was designed as the horizontal sweep amplifier for NTSC television sets in the '60s. They have an input power of about 15 Watts and an output power of up to 5 Watts. Plenty beefy to drive the horizontal sweep of a CRT. These are fairly common and have been pressed into service by the Ham Radio community for use as QRP CW transmitters. I built a crystal controlled CW transmitter for the 40 Meter Amateur Band. With about 5 Watts output into a 40 Meter dipole antenna, I was able to work a station in Flint, Michigan from my home near Philadelphia, Pennsylvania. Not too shabby for a little 1 bottle CW QRP rig! I've got the plans for this little XMTR from a Electronics magazine from, I believe 1967. I'll e-mail you a copy when I find it. Great job on the mailbag segments! Enjoy your KZbin channel immensely! Cheers and 73! Joe, Media, Pennsylvania

[@EEVblog]

Thanks for the detail.

[@georgegonzalez2442]

6AQ5 is a 1939 6V6 in a 7-pin base. Used for audio-output mostly, once in a while used for Vertical output. It's too small for horizontal output. HO tubs almost always are bigger and have a plate top-cap as the voltage spikes there are in the thousands of volts!

[@joedempseysr.3376]

+george gonzalez Yes, you are correct. It was used as a vertical output, not horizontal. I actually salvaged one from an old TV back in the 60s. Then I built the 40 Meter transmitter from an article in the March, 1967 issue of Electronics Illustrated. I was only 13 when I built the rig. It didn't resonate because I used a 1/4" coil form but at the time, I didn't know what the problem was. Fast forward to 1977. I was now an Electrical Engineering student at Drexel University and had learned how to calculate the inductance of coils and the resonant frequency of L-C circuits. I calculated the resonant frequency of the existing circuit and noted that it was too high. I re-calculsted the frequency using a 3/4" coil form and it was just above 7 MHz. I rewound the coil and placed it in the circuit and tested it into a dummy load. As I adjusted the tuning slug on the coil the transmitter resonated, the neon lamp started to glow and my receiver let out a shriek! It worked! I plugged the 40M dipole cable in and re-tuned for maximum output. I was able to work Flint, MI from my home near Philadelphia with a rig I made when I was 13. I still have it! :-)

[@elek101]

Could you post the plans for building my own ?

[@sotosz1]

Hi, all Sotos here: About the Panel meter case , I found it in a Chinese factory that manufactures display enclosure boxes . The PCB was built having already the enclosure and not the other way around...

[@davadoff]

Please share where you can get it or how to find it like the best search terms to google in order to find things like that. Thx

[@pshq]

These lovely FlippyDot Displays are produced in Poland and are used here in almost all city transport busses. They're indeed really nice things. Even when a bus speeds through a road full of holes, these tiny dots doesn't flip! I'm being amazed by them everyday :)

[@rich1051414]

In the US, dot matrix displays are used instead in most places, which is effectively exactly the same thing accept using LED's instead of flippy dots.

[@JennyEverywhere]

There's three US ham licenses nowadays, Technician, General, and Extra. That's in ascending grades of privileges and difficulty of study. I worked my way up through each to Extra.

[@Abigail-Rebecca]

When I did my Rad Am test in the UK (over thirty years ago now) the license was in two classes A and B. Class B was the technical test, but restricted you to the higher bands. To get your Class A (and give you the full Rad Am bands) you had to pass a Morse code test. Of course, when they changed the way the tests worked, anyone who had a Class B was given full privileges, which upset a lot of Class A Hams who'd gone through the Morse test.

[@cypherf0x]

The 5751 tube is probably worth at least $50 US if it's good. The JAN (made for military) black plate phillips ones can be over $150 each. 6HG5, is common and about $10, 5749 is $5, The 6350 runs about $25. The 6AK6 is another $5. The 6BC7 is cheap, The last one you didn't give the correct model but it looks like a rectifier tube, maybe a 5AR4 which is a treat at $100+ for a quality US one.

[@ZomB1986]

Them ugly one look the same as my 5Y3GT

[@voltlog]

the pcb holder with magnets, such a neat idea. Anyone can put that together at home with very little cost. Nice!

[@treborrrrr]

I used zernit clay and a magnet to make something very similar many years ago. It works quite nicely.

[@donaldfilbert4832]

The Yamaha repair request reminded me of my Dad. When I was a freshman in Electrical Engineering at ISU - he wanted me to repair his broken ham radio with just a screw driver and a hammer !!! What ?? What ??

[@robinkopetzky7945]

Thanks for showing the PCBite! Best design I ever seen! Way to go, Dave!!

[@mirkomueller3412]

The pcb board holder looks fantastic. Great idea also the mirror surface so you also have a look under the board. Very well engineered. Love it...

[@MrAlekoy]

The mirror finish on the PCB holder might be useful to make it possible to see the other side of the board when measuring on the top side..

[@KB6NUHamRadio]

Thanks for featuring my study guides, Dave. I love your show!

[@Novous]

10:20 It'd be interesting to measure the reported strobe frequency given the aliasing from the 50 Hz maximum camera frame rate. (ala below Nyquist limit)

[@cadikaorade828]

Dan Romanchik's study guide helped me get my Technician license. Thanks, Dan!

[@AdrianTechWizard]

Hey Dave, If the base of the PCBite is mirrored you can see the underside of the PCB. That would save you from flipping the board when troubleshooting should you need to...

[@pocoapoco2]

Maybe the mirror finnish on the pcb holder is for viewing the underside of the board easily.

[@DoRC]

on those flip dots I think the maximum pulses means how many pulses it can handle not how many times it can flip. based on a 70ms flip time they can only flip around 14 times a second.

[@sensepeek]

Thanks Dave for the positive feedback of PCbite! Updates made to the PCBite kit compared with the early sample Dave tested in this mailbag segment includes but are not limited to: We include insulating washers so that you can power up your creations with even more comfort. These are placed on both top and bottom side of the jaw so that the board is protected. Stronger neodymium magnet, for better experience when using an ESD mat to cover the base plate. There is a PTFE protection cap on the bottom to sustain low friction and protect the surface of the base plate. Decreased height of the PCBites to improve ergonomics during long soldering sessions where you would rest hands on your bench for added support. Height is reduced with 10mm (0.4") while still retaining a wide jaw and perfect grip. The PCB is held 55mm (2.16") above your workbench. Mirror polish on one side and matte(B2) polish on the other side of the base plate, yes we just decided :-) And regarding the price, the price on Indiegogo now include worldwide shipping and all of the above updates. /Johan Hellman - Team PCBite @ Sensepeek

[@albinekb]

Why isn't the "inside"/"middle" part the moving part? Like it is now and he shows in his video, when pushing down it will "flex" down. If the middle was dragging down on the board instead, would it be better maybe?

[@Keex11]

They look very sturdy and well thought out. Good job!

[@moycakes]

When candies, and other plastic-wrapped things go into a low pressure environment, such as a plane, the air is pulled through tiny microscopic holes. I've taken American snacks over seas in the past, and each time the bags are usually rather shriveled up after a flight, and you can definitely smell whatever is in them.

[@thomasesr]

The PCBite mirror finish is a nice touch, to be able to see the underside of the board without flipping it.

[@rich1051414]

"Are those dots green or yellow?" Yes. Magnetic coupling :D I suppose you have to be careful about the amount of current you use to trigger these.

[@LordPhobos6502]

About 500mA per dot flip... give or take.

[@rich1051414]

@@LordPhobos6502 I would think that if you are too sloppy with your regulation, you will have dots flipping neighbor dots.

[@TheCRDMiller]

That Yamaha board, what the heck?

[@sparkplug1018]

If I were to venture a guess, id say someone tripped over the cord and broke the board. Not really sure how youd blow the ass out of the speaker output connectors though.

[@HootHinge]

eevblog trollin at its finest

[@programorprogrammed]

A good laugh

[@sparkplug1018]

Yeah or pure troll.

[@Graham_Langley]

+sparkplug1018 Apart from the broken board it's all desoldering damage.

[@genkiadrian]

+EEVBlog Dave, these hamradio study guides are designed for the US exam. Aspirants from other countries will have to use other study guides as the exams are often different. I got my ham license in Germany and the questions in the exams are definitely different from the US ones.

[@MrTripcore]

Watching you open the package at normal speed is half the fun!

[@Hammerjockeyrepair]

I am guessing, the mirrored finish on the pcb holder is so you can see the underside of your board while you work. You could see the shadow of your solder tip etc, seems very useful!

[@consolehacker54]

The 6AQ5A is a miniature beam power tube usually used in audio amplifiers as a second to last stage or output

[@marzacdev]

Thank you for showing my little music shield project. I am eager to hear and see what future users will make of it. Keep on doing great educational content.

[@Kd8OUR]

there are currently 3 classes of amateur license in the US that you can test for, a 4th you had to have when it was an option. Technician, general and extra are the options for new hams. Some still hold an advanced license, a hold over that is no longer used... Oddly it grants a bit more than general on some bands, but not the full amount that the extra license grants.

[@mmmhorsesteaks]

hermetically sealed, yes. but plastic actually has only very moderate barrier properties. this is why polypropylene is chosen over polyethylene: polyethylene would be even worse. also the reason why the inside of the wrapper is often metallized: it drastically reduces permeability. the main concern is oxygen or moisture getting in, for most cookies.

[@phil41055]

The little rubber ring on the flashlight is so you can use it in a "cigar" hold, pinched between your pointer and middle finger and activated with your thumb

[@AllToDevNull]

I think the holder plate is reflective so you can see the under side while working on it.

[@ssh3mk]

That PCB holder has a mirror finish so you can see the other side of the board without flipping it when soldering. Really neat.

[@funcatvids9198]

I love that electromagnetic displays! Very clever design!

[@JN.0_o]

I bet that the bottom plate of the PCBite is a mirror finish so that you can see what's going on underneath the PCB as well as being able to shine light up from the bottom. I can see why that would be handy.

[@irishRocker1]

for the 5751 valve, I had a JAN Phillips 5751 that was worth about €50 at the time i bought it for a guitar amplifier. Not sure what it is worth now or what the national brand one in this video is worth but the 5751 is like a lower gain preamp valve. I think it was around 70 gain as opposed to the gain of 100 from the common 12ax7 valve. And it sat in between the 12ax7 (gain: 100) and 12au7 (gain: 20). All three are used in guitar amplifiers.

[@mgscheue]

Yep, in the US it's, in order from bottom to top, Technician, General, and Extra.

[@AureliusR]

There's actually three classes in the US. Even more in Australia, I believe. In Canada there are three as well.

[@amicloud_yt]

Wow, the flippy board display is super cool! Works just like DLP!

[@hikaru-live]

About food smell outside of the packages: there are two ways smell can get out of the packages: 1) the packages are hermetically sealed, but bits of its contents flying around the factory as dust in the air can stick on the exterior of the packagingafter it is sealed; or 2) some food packaging materials are designed to allow gases (and only gases) to enter and exit. For chocolate-covered items the latter is likely as natural chocolate, like wine, have the concept of aging, and hermetically sealing it prevents that from happening.

[@izimsi]

These dot displays seem to be made in Poland (or sold by a Polish company), as seen on the first page of the documentation. Had no idea they do these things here.

[@ccricers]

The Yamaha board reminds me of the headaches I had trying to fix a old Korg DW-2000 by myself. the online store told me it was in good condition but the internals were DOA- blew the internal fuses every time I turn the power switch on.

[@MrSparker95]

Nice, I have always wanted to know how these dot displays work!

[@MPnoir]

There is a pretty cool setup of these flippy-displays at the Autostadt in Wolfsburg, Germany. Its in the retrival hall where you pick up your car. There they set up these displays as a ring and they display the names of the persons who are next to get their car. In between they even do pretty cool animations with them. My favourite one was basically grass in the wind , where the noise of the plates turning is also used as a sound effect.

[@MPnoir]

Found a video of it if anyone is interested watch?v=ZHLwgS8X_-c

[@Graham_Langley]

+noir Nice - thanks for that.

[@AIM54A]

That RCA tube box is showing a department of defense acceptance stamp. The other mark looks to be Navy. at 5:38

[@acceler9]

Agreed, I think JAN means Joint Army Navy and was an effort to standardize vacuum tubes (hence the equivalent tube listed). These are generally very high quality and have been selected for low noise and long life. Winner!

[@FennecTECH]

Ham Radio With Viewers is a neat concept where you chat with viewers arround the world over ham radio!

[@joopterwijn]

Ham radio license, for instance you like to be prepared and go hiking. Can be safety option if you go to the outback and have no cell coverages.

[@MyDaoust]

the rubber ring on the flashlight is for a picattini rail. (mounting to a gun.) and the slower strobe mode is actually a s.o.s

[@MisterTalkingMachine]

Yes, there are valve collectors. The smallest of the bunch looks like a double diode you would find as the horizontal detector in TV's.

[@zaprodk]

The JRC JAN tubes is for military use - probably why there is that special writing on the box. JAN is short for "Joint Army Navy"

[@Kek5kopF]

Nippon chocolate candy is awesome, love it!

[@BMRStudio]

This pcb holder is... wow :) I like the mirror under, because You can see the back of the panel. Sold!

[@johnrehwinkel7241]

There are a few people who collect vacuum tubes (Tube Collectors Association comes to mind). That 5751 is a low-noise version of the very popular 12AX7. National (AKA Richardson) didn't make a lot of their own tubes, but bought in tubes from a lot of makers and added their own markings.

[@0ADVISOR0]

The place which you see on the first postcard is located in Munich. It is called the Marienplatz (en: Mary's Square, i.e. St. Mary, Our Lady's Square) is a central square in the city centre of Munich, Germany.

[@nonsuch]

5751 is a right under the 12ax7 as far as gain goes. 6AQ5 is a standard lower power tube. About 12w max. 6BA6 is a remote-cutoff pentode used as a rf amplifier in standard broadcast and FM receivers. 6350 is a low power medium-mu twin triode. 6AK6=6AU6 is a small power pentode around 1w max. 6BC7 is a triple diode. 330v peak inverse voltage. The big ugly one looks like a rectifier tube. Any number off the box?

[@IvoTrausch]

Packets with lots of tape would not be such a problem with a practical knife... Might have to send one in

[@IvoTrausch]

Choobs! Yeah!

[@cameronwebster6866]

Wrapped in LOTS of tape.

[@AMalas]

+Cameron Webster oh that would be master troll... like finish two rolls of cheap tape on the package!!

[@SproutyPottedPlant]

Love the Lumintop torches, my favourites are small AAA lights and AA lights.

[@DjResR]

1:58 It's because the package is made of thin plastic and it slowly leaks scent chemicals through the gaps between the polymer molecules.

[@TheHotEndChannel]

we have 3 classes of HAM in Australia. Foundation (newbie) Standard (normal / me) Advanced - de VK3LAJ

[@DoRC]

that flip dot matrix would make a awesome clock. just show one digit at a time

[@uriituw]

With the board holder, why's each holder in its own seperate bag?

[@EEVblog]

So they don't get scratched in transit.

[@frac]

The mirror finish on that is almost definitely so you can see the underside of the board while it's clamped.

[@marshaul]

That didn't immediately occur to me, either. But, if it's just a finish, and it could potentially be useful (which it could), then why not? So, nice thorough design. I kind of want some of those PCBites now. Although for $50 I might want some ability to lock the clamps with a 1/4 twist or so.

[@djcarbine3074]

If one side was matte and the other mirror, they could use rubber feet with a small magnet embedded in them that you could position on either side..... but this would probably drive up the price

[@lilalaser]

The first box is branded "Bürklin" --> authentic!

[@Lorem_ipsum_dolor_sit_amet]

Vacuum tubes? Pffff, more like thermionic valves. Am I right guys.

[@robfenwitch7403]

Are you still out there in the aleph, Count?

[@Lorem_ipsum_dolor_sit_amet]

Rob Fenwitch You're the first person to catch that. It was a coin toss between Bobby or Henry Case. Nice to know there are still readers out there.

[@seanhornibrook]

That RCA tube: JAN = Joint Army / Navy. Mil-spec tube. They had their own numbering system and a slightly different design spec, hence the warning label. That's a top-tier valve you got there...

[@SuperAWaC]

i've got a similar lumintop to your edc. great little flashlight.

[@qwertyFUBAR]

09:15 Best way to expose protection circuit is to bite the top off the battery

[@irishRocker1]

I think, shorter sections, open them up and get through the contents quickly and if they are more technical or need more details, just say you will look in more detail at the end of the video. So you have first part with short sections and then the longer more detailed sections at the end so that it doesnt interrupt the flow of the faster sections. Thanks Dave.

[@gtb81.]

most of those tubes are for radios and test equipment, thats about all i know of them i dont know their value the larger one is a 5y3 full wave rectifier

[@operator8014]

My dads old AMPs all have those GE 5749s in them, I don't know if there's anything special that makes them good for audio quality specifically.

[@polytech_nu]

* Sorry, the message became longer than I intended initially... JAN = "Joint Army Navy" This "JAN" designation is used to indicate a more robust mechanical design. (Mil-spec.) The electrical specifications are the same as "normal" tubes. CV-numbers = NATO stock codes. There are a lot of different designations for the same tube. The well known ECC83 (European designation) is exacly the same as 12AX7 (American designation) and also (with different pin connections) 6H2N-EB (Russian designation) (Source: amateurtele.com/index.php?artikel=104) Sometimes "SQ" is added to indicate "Special Quality". In other cases this could indicate a newer generation of the "same" tube. Like the original 6L6 tube is evolved to 6L6G, 6L6GB and 6L6GC. There are many designations for vacuum tubes/valves. A lot of tubes have the same characteristics, but different bulb shapes, filament voltages or maximum ratings. For example; the 807 tube can be used as a 6L6 replacement. The shape is different, the tube sockt is different and still suitable as a 6L6 amplifier. The 807 can handle much higher voltages, therefore is the 807 used my hamradio operators in RF amplifiers. The 6L6 can not be used in this case since the maximun voltage is lowe due to the physical shape (risk of flashover at the socket). Luckily there´s a lot of information of comparing them. Google is our best friend. ;-) 5751 (=GL5751 =CK5751) Double triode for audio amplification with 9 pin Noval base (B9A). Direct replacement for the ECC83/12AX7 tube. "The" high gain (100x) amplifier tube for low signals (guitar/microphone) in the preamplifier stage. The ECC83/12AX7 is very common tube and still in production! (Mainly for guitar amplifier use.) The 5751 the audiophile's choice compared to the ECC83/12AX7. (Not judging.) 6AQ5A/6HG5 (=6669) Beam power output pentode with 7 pin Miniature base (B7G). Used as an output tube driver stage. 5749 (=CV454 =GL5749 =CV4009 =6BA6W =5749W =CK5749) Pentode for RF/IF amplification stage with 7 pin Miniature base (B7G). Not intended to use in audio amplifiers, but known to use in homebrew designs. 6350 Double triode (gain factor 18) with 9 pin Noval base (B9A). Used in early computers. Very nice for audio (midium gain) applications! Electrical the same as 12AU7, but the pin wiring is different! Very nice for an audio buffer amplifier or phase inverter for a push-pull final stage. 6AK6 (=CV1762 =A4361) Output Pentode for audio amplification with 7 pin Miniature base (B7G). Very nice tube to build a "small" 1,1W audio anplifier. Rather cheap tube and great for experimenting/learing about tubes. 6BC7 Triple diode (not suitable for a power rectifier) with 9 pin Noval base (B9A). Maximum 12mA per diode. Likely used in radio receivers for AM demodulation The last 8 pin Octal base tube looks like a (rather low current) double rectifier. I couldn't figure out the type based on the shape. @Dave: If you are intended doing a video about vacuum tubes/valves, the 6AK6 would be my guess. This shows most of the aspects for understanding amplifier tubes and designs. And also cheap and good available for everybody playing along at home. ;-) By the way; VK2EEV sounds great! (It's not registered yet.) A lot of electronic enthousiasts are also hamradio operators and could be "a whole new market" of viewers. ;-) Jacob; PE2CJ

[@antidecepticon]

I think what would help is if you get b roll footage of the products, up close shots can be cut in while you're talking about somthing, you can focus in on it with the b roll footage =). it does make production a bit more difficult.

[@XeonXR6]

I get the feeling that guy was trolling you with the Yamaha board :)

[@funkyironman69]

Melbourne also has an MIT (Melbourne Institute of Technology) as well as RMIT

[@NightWolfx03]

A long long long time ago, I saw a TINY flip dot display that was in a dead VCR. Has anyone ever see one that like that ? It was literally close to the same size as a 4x40 lcd or maybe a 4 x 20.

[@AAAyyyGGG]

31:22 - MC31112 - dyslexia roolz KO!! ;-) Love those flippy dot displays, they use them on the buses around here... Also have 3mm(?) LEDs in each dot's corner for visibility at night...

[@Daniel456324]

Dave, love your channel and all the contributions you have made to the world of EE. Simply excellent and unmatched! Attention people who send mail to Dave. If you send mail to Dave, please follow these guidelines. Do not send old electronics that have 30 years of cigarette smoke on them. Don't send mail that has been dipped in STICKY pop. When you are sending in a review of your electronics pcb boards, always send the schematic! Do not send mail where the packaging has glass fibre in-bedded into the packaging that falls apart upon opening the bag. If you really want to piss him off, do all the above, and your mail will be sent straight to the trash bin!

[@toysareforboys1]

Best mailbag ever!! Love the format, thanks for listing to the viewers :)

[@richfiles]

I want to order some flip dots at some point as flag indicators for my Kerbal Space Program controller, to mimic the electromechanical flag indicators used in the Apollo Command and Lunar Modules.

[@sunebrian1423]

6AQ5A-output stage can be a nice radio amp tube, but seems you only get one. Sad~

[@russellthompson3201]

On Tubes -- JAN JRC are mil spec. the last tube looks like a rectifier.

[@LycanWitch]

A suggestion which may be better than just speeding up the video for opening the boxes is to pre-open the packages you get (just cut the tape). however do not peek inside, let that remain a surprise :)

[@oldestnerd]

The large octal base tube could be a 6SN7 dual triode...

[@leandrolaporta2196]

wow i love those fplippy dot displays, please do something with them, i dunno maybe with an arduino and a ethernet shield, just for the fun of it, they are impossible to get here in my area.

[@iPelaaja1]

That would be amazing! Like a real time subscriber counter, or live weather data... But arduino, ethernet shield and flippy dots.. That would be awesome!

[@zlotvorx]

Could the arduino manage 368 flips/second? I expect Dave to do full speed animation with this thing ;)

[@iPelaaja1]

zlotvorx why 386 flips per second? Flipping each dot that many times a second? Or have that amount of dots (why that number?) flip every second? Its only 1-bit color too.. So you cant really show anything too amazing anyways, so you dont need fast flipping. Arduino might be able to do it if something else is generating the patterns (eg the arduino is only driving the display, but gets the information from somewhere else). ANd for "animations" you need quite a lot more pixels too :)

[@ccricers]

Yeah they're not really meant for high refresh displays- I usually see them on buses to name the routes they go on. So mostly just informational displays.

[@krzychoocpp]

While you're mostly right, as majority of applications don't require fast switching, these flipdots actually can flip really damn fast. There a few videos on YT with display walls made of them, check them out. Absolutely mindblowing.

[@andykaylor2777]

Those sexy tubes, I saw some of them in the processor boards in the old 1930’s computer system

[@patprop74]

Hi Dave, time index 36:54 could you explain what the L402 inductor is used for please. I see those a lot and always wonder what they do.

[@xAbdulRhmanX]

Hi Dave thanks for the video :) can you please make a video about that display. Thank you.

[@Boomdoggles]

vk2EEV is currently not in use

[@FelixNielsen]

I want me some of them flippy dots.

[@nutlock2857]

Go on Dave you might as do your licence!! Just think what little Sagen will think when you build your first antenna and talk live to another station on the air using it -great fun !! the pair of you will never forget it.

[@tpaairman]

None of the tubes are particularly worth a lot of money, but in the US there's still a pretty good sized crowd doing antique radios and tube electronics, so they are not entirely useless. By the way, JAN stands for Joint Army Navy. It's a military grade tube.

[@johnsenchak4169]

Dave likes the "nipple" interesting. Does Nippon Chemicon make "flux capacitors"

[@Pillowcase]

i didn't know the flip-dots latch! thats cool

[@EEVblog]

Would draw a huge amount of current if they didn't.

[@Pillowcase]

thats a very good point.

[@AureliusR]

Dave -- VK2EEV is available.

[@macro820]

+eevblog and a million wires to avoid multiplexing!

[@JordyValentine]

That torch looks great, would be good for work, might have to grab one