Відео

you need soldering iron tweezers

thanks for showing the tester, i checked your video before just minutes ago ordering one. i'm very suspicious on the capacitors in some of the devices which rest in my shelfs and from other youtubers i learned better to be safe than sorry on checking the capacitors before blowing them up which costs more work than neccessary. best, albrecht

Thanks for showing your Uher Report in detail. Yes you like it a lot and one can see this from the way you are showing it. And moreover there is nothing whatsoever wrong with it because it is a brillant machine. I stare at the folders from Uher for many decades since I was interested in recording. It didn't become my job and there are so attractive easy ways to take digital record nowadays but all these IT solutions are by far less interesting nor fascinating than a descreet machine of high workmanship and brillant construction as the Uher Report. Yes the Nagra are amazing in their own untouched class but there was this wide customer range from musicians and radio professionals to ambitioned tape amateurs and scientists, a large market of people who didn't want or couldn't pay the nagra but still wanted a reliable mobile reel to reel machine and the Report just filled this gap with excellence. After watching your video I already feel that I might need to buy one sooner than later. Sadly my matching Sennheiser MD421 disappeared and I beleive they have been stolen. Anyway, there will be a Mic to feed the tracks. I complete forgot the single track recording feature. Thanks again and keep up the good work on electronics saving them from scrap having fun with it. Best, Albrecht

Nice work ! 👌

I'm a little curious why not use the original MH0026? It is available on eBay and not expensive.

TY!

Hi, I would like to build 2 mono amps with ECL86 optimised just for tweeters (crossover point 2.1kHz). Additionally I would filter out frequencies below 1kHz before even entering the amps. Do you think would it be possible to achieve good performance without negative feedback but just with no-compromise, ultra stable, ultra fast power supply?

Hi, Thanks for the videos it has been a great help to Me learning all this stuff. I am attempting to design and build My first Tube power amp. My goal is for about 15 watts class A single ended and probably triode output. I am designing to load lines and have researched loads about how to do that. I am attempting to build using parts that I have salvaged from broken tube amps and only buying in when I have to. I have obtained a pair of 811 triodes and I can drive them with some 6SN7, and keep all the circuit as simple as possible with just enough feedback for linearity. Best Wishes Jahmahrah

Great job! Thanks.

My New freind this lovely beautiful maskine ❤❤❤😂

ECL86 is expensive as there's not many that have survived because they fail in service and my late partner mentioned "they were never much good", the ECL82 "was a much better valve". The '86 can deliver 4W more than '82's 3.5 and the gain's higher on '86 but by today's standard, abysmal. I built a stereo 2 X '86 amp recently and went through 3 of the '86 during testing so not robust, at all. It's commendable that hobbyist are experimenting with valves so well done for keeping interest going on these designs. Interesting upload. 🙂

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 ;-)

❤

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?