After repairing the Kinki Headphone Amp, Mark puts it through a Kinki Endurance Test, to see if he can blow it up again. Is it really over-engineered? Follow the link to see what's new and behind the scenes: / menditmark
Пікірлер: 229
@Matt_Aquila2 ай бұрын
"If you don't connect anything silly to it, it won't blow up!" - best electrical advice ever!
@luminousfractal4202 ай бұрын
and ive been told that before. my grandpa when he was teaching me to wire a mains plug as a nipper 😂 my parents werent so happy. and i proved them right when i plugged my scalextric to the mains in an attempt at a 30ft car jump out of the window. i got my bed on fire instead 😂
@matthewseymour89722 ай бұрын
@@luminousfractal420That's known as the Clarkson approach "More POWERRRRR"
@mr_b_hhc20 сағат бұрын
On par with "Don't touch it when you're wet"
@AntiDot702 ай бұрын
Mark, you really need to start selling stickers and t-shirts with "If you don't connect anything silly to it, it won't blow up!"
@nudebaboon48742 ай бұрын
I'd buy one!👍
@AstrosElectronicsLab2 ай бұрын
I want a t-shirt with his facial reaction after being shocked with that SMPS, with the caption: "Cor! Fkn hell!" haha that'd be funny.
@RickMahoney20132 ай бұрын
I totally agree !
@andrewwturner2 ай бұрын
It's always a treat when you release a new video and what a gem this was. Not many people could explain thermal dissipation without sending their audience to sleep but you pulled it off perfectly. I bet you spent a considerable amount of time working on this short video... Thank you.
@abigailhowes59442 ай бұрын
I wish you lived near me, as I would bring some of my electronics that need repair to you. Mark you are a true technician., not just a parts replacer. I watch you repair things, make new parts from scratch, and analyze a problem. I have only seen once where you couldn't fix something, but everything else you could. You are a joy to watch! Thank you and keep up the good work!
@bask21402 ай бұрын
You often sound like an old radio announcer from the 1930s using a carbon microphone 😄
@JohnCompton12 ай бұрын
$1,300? She's way too Kinki for me...Thanks so much for sharing!
@Clusterworldde2 ай бұрын
Did you see the USB cable with 20cm for $309 🤣
@Petertronic2 ай бұрын
Audiophools and their money 😂@@Clusterworldde
@PaulHigginbothamSr2 ай бұрын
John: when they put an insulater on their mosfets I don't want it either
@sickofthestupid10672 ай бұрын
China has learned capitalism well ..........
@markianclark96452 ай бұрын
She's too hot for me..even at my peak 30 years ago
@glennbarker2222 ай бұрын
Good job you decided to do the follow up test and identified the duff input socket. Nice bit of testing, interesting.
@thedevilinthecircuit14142 ай бұрын
There are so many little things that occur in your diagnostics and demonstrations that are unintended teaching moments--but when I pay attention I pick up stuff that's not in any book. Thank you sir!
@BenState2 ай бұрын
Like what?
@BoredSilly6662 ай бұрын
I have no idea what you are doing half the time or do I understand Electronics but I find these strangely fascinating to watch. : )
@danhorton61822 ай бұрын
Would have been cool if they had made it so that when you put the top of the case on that it would made connection to the heatsink and drawn heat from it. Essentially make the whole case a heatsink.
@allantoft99612 ай бұрын
And mark would have so much fun getting the case of then I tell ye!
@Edisson.2 ай бұрын
I have a 100W test amplifier for SW cooled in this way - a 50x20x17mm aluminum monoblock connects to the entire case - total external height is 30mm.
@hashtag-shaneiacs2 ай бұрын
Naim amps are made this way but they're bolted to the case floor with a thick substrate. I imagine the top would be too hot to touch if they're bolted to the lid instead.
@Edisson.2 ай бұрын
@@hashtag-shaneiacs I don't know about Naim amps, I built it myself
@mohindersembi76472 ай бұрын
Hi Mark 👋 you are really master professional electronics engineer 👏 Always watch your videos and you are the best on KZbin 🎉😊just to find out when are you going to do video of aiwa 3 head cassette player? Follow up ? We all are waiting for it please let us know 🙏 thank you
@edwardpeak49372 ай бұрын
A great film, many thanks Mark. I know it must take ages to make these, but the extra technical stuff in this one was very welcome. Best wishes
@ulrichfrank42702 ай бұрын
Repair video made me think this device was at the same time over-engineered (for show) and half-baked.
@codebeat41922 ай бұрын
Exceptional amount of detail, very talented at many fields.
@DominicClifton2 ай бұрын
Thanks for answering my question regarding the use of Kapton tape, very interesting. So essentially it's good for protection, but is definately worse than a thermal pad which is what I thought, but not quite as terrible as I thought.
@peterlarkin7622 ай бұрын
Kapton is better than some thick silicon pads. Thin Mica is better than silpads but you need thermal paste then, which makes them equal. Aluminum oxide is best.
@TheStuffMade2 ай бұрын
It's a very strange design, usually you'd want the output impedance to be as low as possible so variations in the headphone impedance will not affect the frequency response.
@nabman_2 ай бұрын
2.2W into 30ohms is 270mA. Why such hefty transistors? Why such complexity for driving headphones? The least sensitive ones would still reach painful SPL with mW. I don't get it.
@chrisbartram30342 ай бұрын
No, nor me. Loads of power loss heating up the amp to drive a low-level load...
@nabman_2 ай бұрын
@@chrisbartram3034 with 70V rails....the art of snake oil....
@rvmeushaw2 ай бұрын
Fantastic repair as usual and an engineering lesson to boot! Great job.
@TechGorilla19872 ай бұрын
This is the deep dive that I never asked for, never thought of and didn't know that I couldn't live without. What a fantastic series of tests to gather empirical data. Well done, lad.
@MichoCoban2 ай бұрын
Reminds me of the nights spent troubleshooting dodgy circuits while at Uni
@alunroberts14392 ай бұрын
Could this be changed a bit so the lid makes contact with transistor heat sink
@mortjoer2 ай бұрын
I'm a carpenter by trade and people seems to love to look over my shoulder when I work on stuff. This is where I get my own curiosity satisfied about other trades thanks to people like you Mark, Thank you 😊
@enoz.j35062 ай бұрын
Unless someone overloaded the output,thermal stress probably killed it, the cooler you keep electronics ,the longer it lives. Nice one Mark.
@NotMarkKnopfler2 ай бұрын
It's all a bit much for a blimmin' head phone amp really, isn't it?!
@alphaLONE2 ай бұрын
Excellent work of verifying the claims. Love your stuff!
@eddieMurphy111112 ай бұрын
I often wondered what that plastic was called now I know thank you and thanks for the video
@nevillegoddard49662 ай бұрын
@@eddieMurphy11111 Yeah capton. Cool name!
@jinxterx2 ай бұрын
@@nevillegoddard4966 Kapton.
@richbrock98762 ай бұрын
Know yer onions 🏆
@Dave.Wilson2 ай бұрын
He knows his currents as well!!😉
@edmaster31472 ай бұрын
Thanks for the follow up. Nice work as always.
@xxxxDuke2 ай бұрын
These videos are such a labour of love - thanks Mark.
@kenneths95222 ай бұрын
Thanks, nice job Mark! I always enjoy your videos.
@hw45272 ай бұрын
Thank you for posting. 👍👍
@stephenyoud61252 ай бұрын
Nicely done Mark, as per usual !!
@andyb78132 ай бұрын
Another Really interesting video Mark. Thank you
@sjqideez66262 ай бұрын
Fantastic stuff Mark, much appreciated
@tony3592 ай бұрын
Thank you for adding science to the previous video!
@mixolydian20102 ай бұрын
Cheers Mark,nice experiment.
@Cee.Jay.712 ай бұрын
I've been away for a while but it's nice to see your channel is blooming. Thoroughly well deserved Mark.
@billsmith51662 ай бұрын
Very interesting. Well done.
@stianhus2 ай бұрын
that was just brilliant, you never cease to impress (and educade) Mark!
@user-sh4zq4ge1o2 ай бұрын
Love this style of video, more of these deeper dives into particular part of a design would be great.
@pantelisEVs2 ай бұрын
Thanks for making this video! Really interesting getting into expensive audio equipment (for personal audio project design ideas :-)
@davidtomsett2 ай бұрын
Kapton is also used to make membranes for electrostatic and planar speakers.
@kerrygleeson44092 ай бұрын
Thanks for sharing Mark 🦘
@oiygfdxssfgg2 ай бұрын
I really enjoy your videos Mark.
@scossa_vr2 ай бұрын
Great Mark, very interesting, thanks for sharing! P.S.: your youtube channel is the only one whose intro I also always watch, too funny!
@brynybach77412 ай бұрын
Another great video Mark 😊👍
@gijoemolinaro2 ай бұрын
Love your vids Mark absolutely brilliant
@barrybradfordlocksport2 ай бұрын
Love the channel need more uploads please mark
@Bigbluevwvan2 ай бұрын
nice in depth testing
@DinghTech2 ай бұрын
Adding fan on top would be nice but need more work with CNC machine to make the hole. Love your video always.
@glynnetolar44232 ай бұрын
Oh no. You may end up with electrical noise from the fan.
@quantumleap3592 ай бұрын
Oh goodness NO! That would introduce distortion and offend those "golden ears".🙃
@chrisbartram30342 ай бұрын
Why not just use the case as a passive heatsink, though?
@OldePhart2 ай бұрын
Liked this one. First time I've seen the thermal gradients explained at all.
@TheFlyingBusman2 ай бұрын
For a headphone amp, I’m surprised at the chunky MOSFETS but even more so at such a poor heat sink. The Chinese, bless them, churn out some interesting kit but let it fail due to attention to detail. I’d be much happier with some slots milled into the heat sink to give a bit more surface area or a few vents and small brushless cooling fan. Who would have thought a headphone amp would get so toasty but there you go.
@chrisbartram30342 ай бұрын
I'm also a bit mystified by why so much power is dissipated in the amp to drive only a few watts into headphones.
@gordonm28212 ай бұрын
Thanks for the in depth reply to the comments. I know there were many armchair expert comments on the original video but great to see the science behind the design. Still over the top for a headphone amp IMHO!
@user-gu5kk7wr5q2 ай бұрын
great video as ever.
@dvsbangkaeedivisi93692 ай бұрын
Yang selalu saya Tunggu....
@user-go3wx4px2p2 ай бұрын
Mark, I know you hate them but I request more tape deck repairs. Pure joy for me. You are my favourite channel on KZbin.
@kthwkr2 ай бұрын
In the studio I needed different types of headphones to be driven at similar volumes with the same Vol pot setting. Some of the ops would bring their own headphones so we couldn't standardize on one type. When driven by low Z headphone amps into the Sennheiser(hi Z) versus AKG(low Z) versus cheap headphone(8 ohm) the volume to the ears would be dramatically different. I put series resistors in the line and got the volumes to the ears to closely match no matter which headphone type. I don't remember the value for sure but I think it was a 47 ohm. The end result was you could adjust the volume for one type of headphone and then unplug it and plug in a different type and the volume would be about the same without touching the Vol pot.
@foxbeef19832 ай бұрын
My new favourite KZbin channel!
@that_thing_I_do2 ай бұрын
Can't wait to watch it at home!
@acswales2 ай бұрын
Head in a shed again. Cheers Mark. Keep 'em coming. Thanks
@558vulcanxh2 ай бұрын
Thanks for sharing 😊, really interesting 👍
@s.wilson56752 ай бұрын
Well Mark, I'm glad you solved that 'heated' debate about whether the Kapton tape was good enough or not!
@gjvdspam2 ай бұрын
Top notch vid, thank you
@bobgrob42 ай бұрын
Alright, Mark! Keep cranking out the vids! Mark I feel in my gut that your channel could be the most popular electronics repair channel on KZbin, given enough time and make a lot more videos. Before you know it, you could be repairing stuff and doing projects just for fun. Keep going, sir!
@user-sr1tq5eb8p2 ай бұрын
Excellent education video 🎉
@PileOfEmptyTapes2 ай бұрын
Good lord, that thing can dish out as much voltage as a 150wpc speaker amp! Clearly a very particular design for those who really love their vintage AKGs (aside from the 120 ohm K1000 "ear speakers", the 600 ohm K340s come to mind). I imagine most folks are going to find the likes of a Topping L50 a more sensible proposition.
@crushbossАй бұрын
If you are going to use a thermal imaging camera for heat transfer differentials (especially between different materials) you need to study and understand emissivity! Especially when trying to gain a accurate temperature on reflective surfaces. 2 Small pieces of black electrical tape on each surface will help, and set your emissivity to 1.
@hugh0072 ай бұрын
Excellent video. If I hadn't seen this, I would never know how over engineered a headphone amp could be. Cheers.
@baronofgreymatter142 ай бұрын
Nice one!
@wdavem2 ай бұрын
Most interesting! I'm learning, I'm learning!
@gordyboy012 ай бұрын
Mark love the channel 👍, as an example couple of legendary Audiophile headphones such as sennheiser HD600 or HD800s are 300 Ohm Headphones. I own a pair of HD600s myself.
@user-uo9bj4nq3tАй бұрын
A square wave signal of 500-600 Hz is also necessary for signal passage and transient processes in the amplifier. Always.
@jamescarver62752 ай бұрын
Thanks
@schummiehugo2 ай бұрын
good job happyman !
@cymaz1002 ай бұрын
Brilliant 🎉🎉
@Dave64track2 ай бұрын
Great content that test would certainly show up any problems if it had any. Trouble shooting is great when you find the fault and it works it's when you don't find all the faulty components and you get the dreaded magic smoke coming out.
@andreacanzoneri42422 ай бұрын
Grande come sempre
@bluesplayer592 ай бұрын
Love the music 🎉
@GaitaPonto2 ай бұрын
OK, you proved it wont blow up. But I still think this design could be improved. With all this aluminum available, why not use it in our favor and keep components cool and comfortable?
@semsem28412 ай бұрын
I watched your video in Thailand.
@rayc15572 ай бұрын
Really enjoyed part 1 of this! Thank you for the follow-up. The amp is awesome too. If played at normal listening levels with headphones, I'd love to know the temperature of the heatsink. That would give insight about the bias level. If you're so inclined, please see if there's a resistor in the output chain by which to measure the quiescent current. Am interested in knowing how far into class-A it's operating. Also, is the driver stage running open loop or, does the the output backtrack to feedback loop?
@moodyga402 ай бұрын
great video
@zuvinrat41552 ай бұрын
great as usual
@ravusursi8932 ай бұрын
Mark, there are not many people I truly admire. You are one of them. You are a treasure and would definitely be at my dinner table of six celebrities, along with Stephen Fry. Keep up the great videos!
@BrendaEM2 ай бұрын
Nice test box! Ironically, there is a sizable aluminum thermal mass with a large surface area--just above the "heatsink." Perhaps, leads could be put on the transistors, and they could be affixed to the lid. And if more heatsink is needed, they could be applied to the top.
@juarezcastelo2 ай бұрын
Ok ok! You were right about the kapton tape! You happy now!!? Great vid btw.
@MlokKarel2 ай бұрын
Mark... I would abandon my 15 years long career as a dentist in a blink of an eye, for a chance to become your apprentice. 👍🍻
@davignonmemarc30002 ай бұрын
Again, a lot of fun !!
@lloydieization2 ай бұрын
As it doesn't have a fan or a need to dampen (mechanical) noise a few case holes wouldn't have gone a miss. If anyone puts another hot device below it etc... its too close for comfort temperature wise on £1300 bit of kit.
@TintukeesАй бұрын
Hi, I have been watching all your videos. A lot of new things to learn from you. I wonder if you you could make a video on your tools and shop. The soldering iron you use seems to be your favourite, being small yet handy and long lasting.
@greevooo2 ай бұрын
Fascinating
@doughostetler89722 ай бұрын
Thanks Mark. !!!!!!!!
@vinatechcoy23 күн бұрын
Mark!. Thermal transferal from the internal heatsink to the case (top cover)
@steverobertsbbc2 ай бұрын
I'm not convinced that "heatsink" is for cooling as much as for ensuring that all four output transistors are in thermal equilibrium so that their responses track together.
@fretlessfender2 ай бұрын
Wow! Nice new concept Mark! Love this! Something different for a change. If you ever find a stupid design, please show it! It's always nice to see pro-brands doing silly things!😂
@davidyates7482 ай бұрын
Very nice scientific test methodology to prove the soundness of the design Mark. Just goes to prove that not everything that comes out of China is crap. That's a lovely piece of test kit that you put together, looks like store bought as our Murican cousins might say!
@davidgriffin792 ай бұрын
10:22 Not exactly unexpected. The Heat Transfer Coefficient (HTC) between the aluminium heat sink and air is quite low due to virtually no fluid (air) flow, so the heat sink soaked out pretty quickly. After that, final equilibrium was reached asymptotically as the inside air temperature slowly increased (due to the low HTC) to approach a final ΔT between the heat sink and the outer casing.
@Edisson.2 ай бұрын
Hi Mark, phenomenal work, problem analysis worthy of a university professor 👍 PS.: How is AIWA doing 🤔 Nice day 🙂 Tom
@billmilosz2 ай бұрын
That bespoke headphone load box - very nice execution! How did you fabricate that front panel? Very nice. By the way, something like an AMB Labs Beta 22 headphone amp is much more rugged, has lower output source impedance (better damping factor, important with certain headphones) and an be made DIY.
@paulchisholm93922 ай бұрын
Thanks for the video. I have beem playing with Exicon MOSFETs in a Power Amplifier design and they do like to oscillate at many MHz. Maybe the MOSFETs died due to cross conduction of the N and P channels because of this?
@peterlarkin7622 ай бұрын
I've seen some references to this... sometimes people don't use gate resistors, or emitter resistors. In real life they are needed, as is a zobel and thiel network. As is a miller compensation capacitor on the n-channel fet. Bad grounding can create oscillations too. Also I found out that lateral mosfets can get minor capacitive interference from the grounded heatsink. So better to use silpads instead of mica or kapton apparently.