![MrVideoTronix](/img/default-banner.jpg)
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- Просмотров 242 044
MrVideoTronix
Добавлен 2 дек 2012
On this channel, I show you self-designed circuits, analog picture and sound recording equipment eg. tape recorders, cassette recorders...
If you want to support me, please join my patreon www.patreon.com/user/22892242
Auf diesem Kanal stelle ich selbst entworfene Schaltungen, analoge Bild- und Ton- Aufzeichnungsgeräte ect. vor.
If you want to support me, please join my patreon www.patreon.com/user/22892242
Auf diesem Kanal stelle ich selbst entworfene Schaltungen, analoge Bild- und Ton- Aufzeichnungsgeräte ect. vor.
Discrete quartz stabilized microwave oscillator [microwave PLL magic]
This video presents my design to lock a 1.8GHz microwave oscillator to a 20MHz crystal oscillator. I got inspired to do this project by the technology used for the Apollo missions. Back then they used discrete components for RF magic. And I took the challenge to do the same. This is built completely with discrete components without any ICs, in 1960s style :)
Просмотров: 274
Видео
Wireless power transmission with vacuum tubes
Просмотров 4912 года назад
In this video, I will present to you a little circuit that can transmit small amounts of power wirelessly. The main parts of the circuit are self-made inductors and of course a vacuum tube, namely the 6BQ7. The 6BQ7 acts as a tuned grid oscillator and amplifier. So no transistor or other semiconductors are used in the transmitter. Watch the video and find out how it works.
Tape recorder circuit analysis
Просмотров 1,5 тыс.2 года назад
In this video, I will demonstrate the basic electrical and mechanical functions of a tape recorder. As an example, I'll be using a Telefunken Magentophone 301.
Vacuum Tube Microphone Amplifier Repair Video - Part 2
Просмотров 3012 года назад
In this video, I will replace all parts needed to make this amp work again. This amp will be used by Half Baked Cheese, check them out here: halfbakedcheese.bandcamp.com/ ruclips.net/channel/UCG7ESmtE3MTMY2QSKVXpLrg Half-Baked-Cheese-272008395454/
Vacuum Tube Microphone Amplifier Repair Video - Part 1
Просмотров 1812 года назад
In this video, I will evaluate what needs to be done to repair a very interesting microphone amplifier. This amp will be used by Half Baked Cheese, check them out here: halfbakedcheese.bandcamp.com/ ruclips.net/channel/UCG7ESmtE3MTMY2QSKVXpLrg Half-Baked-Cheese-272008395454/
The worlds simplest Operational Amplifier
Просмотров 2762 года назад
In this video, I'll show you how you can build the world's simplest operational amplifier. So let's join the journey and find out how many transistors it takes to build it.
Advanced Analog Pumpkin Lamp
Просмотров 1352 года назад
In this video, I'll present to you my Halloween project of this year. The goal of this project was to create a circuit that can modulate the intensity of a 12V lamp with a line audio input and a microphone input. It should also be able to drive a loudspeaker. Both the Loudspeaker and lamp will be put into a Halloween pumpkin. This should allow me to place the pumpkin in front of my house and ta...
The Foster Seeley Discriminator
Просмотров 3,2 тыс.2 года назад
In this video, I will show you an interesting circuit that can demodulate FM. It's the commonly used but hard to understand Foster Seeley Discriminator. I build on and we will explore how it works together, and why it's all about the transformer. Let's demodulate some FM!
Why and how to find the outer foil of a film capacitor
Просмотров 6 тыс.2 года назад
Join me on an exciting journey to find the outer foil of capacitors.
What is capacitor leakage?
Просмотров 5 тыс.2 года назад
My capacitor leakage checker has leaky capacitors in it. And in this video, I will tell you what that means and why they need to be replaced.
JOY-IT LCR-T7 Multi-component tester - review
Просмотров 16 тыс.2 года назад
This is a short review of the JOY-IT LCT-T7 Multi-component tester You can buy it here: www.conrad.at/de/p/joy-it-transistortester-2355021.html
Tektronix TDS 460 - another repair (Huge offset on channel 3)
Просмотров 1,3 тыс.2 года назад
Unfortunately, my TDS 460 has failed again. But this time it's not a capacitor it's something else. Watch this video and join me on the journey of finding out what it is.
Tektronix 2232 repair
Просмотров 4,3 тыс.2 года назад
In this video, I will show the process of repairing a Tektronix 2232 oscilloscope that I acquired recently.
Battery Protection Circuit
Просмотров 2723 года назад
In this very interesting video, I will show you how to build a production circuit for rechargeable batteries. If you want to support me, please join my Patreon www.patreon.com/user/22892242
Differential Amplifier with Vacuum Tubes - Part 2
Просмотров 2493 года назад
In this series of very interesting videos, I will show you how a differential amplifier works. If you want to support me, please join my Patreon www.patreon.com/user/22892242
Differential Amplifier with Vacuum Tubes - Part 1
Просмотров 5903 года назад
Differential Amplifier with Vacuum Tubes - Part 1
ECL86 single tube amplifier design series - Part 3
Просмотров 2,1 тыс.3 года назад
ECL86 single tube amplifier design series - Part 3
ECL86 single tube amplifier design series - Part 2
Просмотров 3,5 тыс.3 года назад
ECL86 single tube amplifier design series - Part 2
ECL86 single tube amplifier design series - Part 1
Просмотров 8 тыс.3 года назад
ECL86 single tube amplifier design series - Part 1
ECL86 single tube amplifier design series trailer
Просмотров 8773 года назад
ECL86 single tube amplifier design series trailer
The iron-hydrogen resistor (Christmas Special)
Просмотров 1353 года назад
The iron-hydrogen resistor (Christmas Special)
Commodore 1084s video monitor repair video
Просмотров 3,4 тыс.3 года назад
Commodore 1084s video monitor repair video
The Halloween circuit (Pumpkin Lamp with a loudspeaker)
Просмотров 893 года назад
The Halloween circuit (Pumpkin Lamp with a loudspeaker)
Grundig VG 1000 Test Pattern Generator repair video
Просмотров 1,5 тыс.4 года назад
Grundig VG 1000 Test Pattern Generator repair video
Hornyphone Virtuoso WM9542A repair video
Просмотров 2874 года назад
Hornyphone Virtuoso WM9542A repair video
Young Timothy Gonzalez Lisa Thompson Amy
It`s almost funny - I fixed one up in the past, and guess what was wrong? A lot of broken Tantalum capacitors on the -15V rail, and a shot rectifier :) Seems there is a seesaw effect in these: some capacitor dies on some rail, damages the rectifier, damaged rectifier overheats more capacitors with high ripple....
Nice work, really liked the analogue approach. Quite useful to learn the basics functioning of PLL in practice.
Well done.
Great video with pretty easy to understand explaination! 24:55 Of course I want a video about the cute f2V converter :-) 43:50 I would say that that's pretty amazing (8 times to be exact) :-D Also can't wait for all the other videos you said you have to make ;-)
And great thumbnail btw. !
❤
Late to the party 5/24. Ali-Ex had the TC-1 (looks the same) on sale too cheap to pass up this time....The Best review/ best explanation of any I've seen. I need not check any more. Two Thumbs up!
Great video! I don’t really work on these types of circuits but understand the terminology so I enjoyed your clear explanations. I use a simple 2235A and thought it might be similar but yours is a/d - I’ll have to look for that! Also, in the states that Fix-x is called “correction fluid” or “White-out” ;)
Mag kano po yan ser
NoScopeNoFun can't I also use a HiZ AC milliVoltmeter? I know it's less fun....but....
Great explanation, I have just worked with small jfets and I can see is almost the same way to bias a tube amp. I must ask, why did you choose exactly1,2mA 36mA for anodes bias?. I can see the mA values are not exactly at the middle of the graph which I always thought would be the best point to bias a jfet / tube.
I would like to see you video the build of this amp Great Video
Really good video with excellent explanation
My poly caps. The rust colored radil generic ones are all testing 10 ohm esr. Confusing
thank you for all the calculations.. i had been wondering how the values of the semiconductors are determined..
Excellent, thank you.
🙏🙏🌹🌹🌹🌹
Mine doesnt turn on
Transistor tester
Your excitement is infectious Very COoL. Good job! Love hearing your "circuit analysis".. This is a nice scope - A/D? I didn't realize that Tektronix had one of these. It sounds like a must-buy. Way more InTeReStiNg than your typical Rigol scopes. You truly have a appreciation for these classic scopes. Who wouldn't want to SUB? p.s. And you explained it all in a 2nd language, AMAZING. Cheers from So.CA.USA 3rd House On the Left
Awesome video thanks I have a 420. It has a stuttering lights flashing on then off fan start and stop at start up issue. When I first got it I rebuilt the one large power supply board actually just new caps. It ran fine for a couple months now this. I'll watch your recap video I guess that's my next step. Love your enthusiasm
Fine repair, watch those (ROE?) brown plastic electrolytics, they gave problems in TVs.
Does this meter work on SMD component board, to find any sort of Leakage / Shortage etc. also?
Great video! Please, can somebody tell me the value of the resistor used in series? Thanks in advance.
Thank you. This is very helpful, as my main interest is tube guitar amps. 😊❤️
Of by the way you where getting distortion because you did not match the ECL82 to the output. Ideal is an 8ohm speaker and transformer though you can also use down to 5 with some component adjustment. Will have to watch the next video to see what you did to fix this.
Well nothing special about the ECL86 it is a simple triode-pentode there where more than 30 tubes of this type in the day. They where used in almost every record player that was coming out of EU land in the late 50s and 60s so I guess the really special part is they are very cheap an quite easy to pick up as NOS. They do produce good sound and I have I worked with them myself the only problem I see with them they really only work with older crystal head turntables that put out a a higher voltage than the 100~300mv from a electromagnetic head. I did try and make a guitar amp but again not enough gain from the single Triode to make it a viable project. Good job on explaining how to compute grid voltage that is the way it was originally computed and was just common knowledge of the day now mostly lost, Thankfully an old RF engineer from my radio club explained this method too me ;) Many of the so called modern 'Tube' experts get it 100 wrong.
The circuit doesn't look right I would take the feedback from the output side of the transformer to give extra compensation of transformer distortion
Vowe 👏👍Awesome.
I BOUGHT IT. IT"S SO FUCKING SATISFYING. TO BE ABLE TO MEASURE TRANSISTOR WITH EASE
cool video Why didn't you use an Armstrong / Meissner oscillator, since its much simpler?
Glad I found you, this is the best explanation for finding out this hidden side to capacitors and why it matters on unmarked components I have come across. I have subscribed and will now watch all your videos. I do hope you manage to keep this channel going even if it is infrequently, there may be lot's of electronic channels but you have a way of explaining things in a very understandable manner which is much appreciated by me and others too. 💐🤔♥️🧀🐈⬛😼🌈🏳️⚧️🏳️🌈🇮🇱🇵🇸🇺🇦🇪🇺💐
€23, ya got robbed
very beautiful osc. I have the 475, but love the digitizer opt.
😂😂😂😂😂😂😂
Excellent. Thank you so much. I've been looking for someone, anyone, to explain these portions of the typical tape player/recorder circuit. Thank you very much for sharing your knowledge!
I build open loop single ended triode amplifiers. I limit the tubes to the most linear part of their response curve. That is how i manage THD. While nfb reduces thd, it also phase shifts it. That can produce a less pleasant sound.
You have another little issue. The transformer you are using does not have a gap in the core. That will cause it to saturate at low frequencies. Your explanation of the circuit is well done.
You would get better base response if you added a bypass capacitor to the triode cathode resister.
Very nice, thank you for helping me understand the design of a simple single tube amp using this very interesting ECL86 tube! I am thinking of using this tube to design and build a headphone amplifier. Question: For amps using an output transformer for speakers, would upgrading the quality of the transformer produce a better frequency response so negative feedback (or less feedback) wouldn't be required?
Excellent video, I love the detail and your explanation on how the circuits work, I've been an engineer since 1980 and it's refreshing to re visit some of these circuits since I have forgotten some, and I'm also a Tektronix junkie.
Ah the ECL86, a classic tube used in many things from TVs to Tape recorders etc. I would say the values for this circuit are so general I already knew every value you calculated in my head. I would however say you don´t want to go higher than 470K on the input especially when using modern audio sources with it as it will introduce distorsion and stuff pretty easy on many devices plus increase noise level etc otherwise so it was a good pick. I would probably use a bypass capacitor on the first stage cathode too when using a single stage pre-amp to increase gain and response in lower end, you can actually substitute the grid resistor and cap all together on the triode and use a LED of your choice to bias the tube, as the voltage drop is constant you bias the tube to the LED voltage drop but won´t limit the current as a LED act like a diode when it conduct and you don´t lose gain because of it. and as you say negative feedback is good to control the sharp high end as well, I always put a 12K resistor in series with a 100K pot for the feedback to make it adjustable. but I would not combine negative feedback with LED Bias though. but I often include a 100-500K pot in series with a 0,1-1uf capacitor to ground to the grid side of the second stage in your case pentode grid, this gives you a nifty tone control that can depending on the cap size cut higher end sound gain and still keep the bass in the bottom for a much more balanced sound, and I likely use a 220K resistor to ground together with that pentode grid too. in many designs it was often a small value capacitor in parallell of the primary winding on the output transformer, this cap cuts high end sound by filtering it out from the transformer completely if you so desire
@@antonioroccuzzo4214 Indeed. The Bias is often overlooked and people like to bias them too cold and it affects the dynamics of the audio. I have typically used a simpler EQ solution in my amps that has it. It is a combination of Negative feedback (with selectable) bypass capacitors and a low pass filter using a capacitor and potentiometer in the pre-amp stage. I had good results from this. In my biggest amp which is a dual mono Class A EL34 I can also pick different Bias resistances and I have a very special home made power supply that I can adjust voltage from 240-500 Volts that have perfect DC output, no ripple. Clean enough to inject to the amp without any filters. I usually bias these tubes very warm to a point they even redplate a bit but the audio is incredible then. Typically I run these tubes at about 150MA each in true triode mode which gives me pretty much output power. I still get long life out of the tubes anyway and the power is also dynamic with special controls I have included that reduces the tube voltage when nothing is playing. Good stuff
The magic of NFB .hiding the problems on the bench and ruining the music ....
Thank you so much!
Amazing!
Really great explanation thank you. I think we should not trust a marked outer foil end, test them all when its critical is a good approach
Have the same Grundig generator,very fine piece of equipment
Thankyou
Hi I've got a 1084S-D1 coming my way. Works fine but may eventually need this fix - Question: Is the HR 7533 compatible for both the P1 and the D1 ? Thanks great vid.
Unfortunately HR7533 only fits in 1084S-P1 and 1084S-P2. 1084S-D1 needs HR46045 as replacement, which is very hard to find.