1982 Boom Box Repair (Telefunken CR100)

[@AnalogueOctober]

Great repair, but the crafting of the new knob was totally unexpected and brilliant.

[@djrenault]

agreed, outta nowhere, and unreal !!

[@SUNILANDTHESTRANGERS]

YEAH. I WAS TOTALLY BLOWN AWAY BY THAT

[@FriPilot]

That custom knob is a class act, Mark! Well done.

[@morpheus232001]

Yeah I like how he moved it over to the single knob as well. More seamless.

[@allanredford6070]

agree. first rate job

[@neu_trino]

Machining the replacement switch cover was pretty impressive - I like that

[@IbrahimTurundu]

Your enthusiasm and chuckling here and there, cleverly merged with detailed instructions made this repair job a pleasure to watch. Thanks so much.

[@Horus9339]

Well someone has to say it, so it may as well be me. What a knob! Impressive repair and fabrication. Thank you Mark for taking us along for the ride.

[@eddjordan2399]

i feel the english of the joke may be lost on many.

[@tomalcolm]

Mark’s knob is legendary.

[@Horus9339]

@@tomalcolm Indeed, it's the shape and how it feels in the hand that really matters.

[@Hellrun]

Busting out the lathe to make tgat knob was next level, totally unexpected. This has quickly become one of my favourite channels

[@marktubeie07]

Mark, you make some of the best tech repair videos on KZbin. I know it takes time to make these as you use superb camera angles, great audio, perfect lighting and above all, friendly attitude. A pleasure to watch and learn from you mate, keep it up! Regards from another Mark here in Australia 🦘🦘

[@irongron]

yea, I'm trying to self-learn electronics repair while I've been waiting to go back home to Donbas for almost a year and this chan is great, only' just foind it, Ben Heck, way too full of himelf and kinda arrogant, and poor old techmoan, he doesn't know what he's doing as he admits in his videos. Mend it Mark is kinda in between them, just right!

[@hugoromeyn4582]

@@irongron Keep up learning, that's a good thing! I Did it the same way... Reading, reading, reading... Learning, trying... Failing, learning... It took me a long time but now, I'm able to repair and even design electronic circuits. Let's pray the war will end soon.

[@futu1983]

I really enjoyed the last part, making the switch cover replacement. Was so satisfying to see the boom box get this final touch.

[@AndreiBaburin]

I catch my zen when when watching vintage audio repair videos. Glad youtube recommended me this channel, lotta more calm hours ahead!

[@Jimmermgb]

fabricating a new knob is the cherry on the cake, magic

[@troyconnolly9053]

Your enthusiasm for fixing a classic old boombox is brilliant. Well done great to watch

[@ChishanFipz]

You went above and beyond what I expected - I would of given up at the fuse! Making another lever switch that fitted perfectly was nothing short of genius. Hats off to you.

[@steveoszman8746]

It's a pleasure to see a good mechanic put things right. Made me into a fan, keep em coming.

[@darrenmillward4445]

Brilliant.. the making of the switch cover was a stroke of genius.. bravo.. bravo..

[@nigelbutler9488]

So easy to pass an hour watching this clever character. Keep the vids coming plse Mark

[@GeoffSeeley]

Nice job on the replacement knob cover. You are a talented craftsman! Man, I wish I have that ghetto blaster back in the '80's...

[@superbad123]

so satisfying when all knobs are complete

[@scofab]

Restoring 70s~80s boom boxes is a hobby of mine... oh what fun. Just finishing up a complete overhaul/upgrade on a JVC/Victor PC-55... there's one you should check out if you run across one. Love that you took the extra time and effort to make the switch trim, outstanding. Thanks again and regards.

[@CHIBA280CRV]

Unbelievable you went and made a button cover 😳 don’t expect any less from you 🤩 you are awesome 👏 👍🏼👍🏼👍🏼👍🏼👍🏼

[@louise_8546]

The switch replacement I wasn't expecting and it made me go WOW - well done Mark! Greetings from Glasgow (and the Highlands). Love your enthusiasm!

[@hernanmartinez1591]

You are from another planet My brain exploded when you started creating the knob. Amazing! Congras!

[@adid.5585]

I like how older electronics were built with serviceability in mind. Back then the culture of consumerism didn't kick in yet and people were still used to repairing their devices rather than throwing them away and buying new ones. Awesome piece you got there!

[@rayofcreation3996]

Exactly. Well said.

[@Okurka.]

Back when everything broke faster.

[@UserAccount-ThisOne]

@@Okurka. sure, things broke just as fast as stuff now does, but there are 2 major distinctions: one: the things that broke faster back then were on the cheaper side, expensive things took a long LONG while to finally kick the bucket and when they did it was most likely something trivial like a busted fuse/fried capacitor or two two: when something did finally give up, you actually had the ability to go in there and do things yourself, you didnt have to attempt to carefully and quietly rip your way through layers of anti repair nonsense made by engineers that just wanna make something good but get paid to do things the stupid way, and then end up having to go to the manufacturer and pay fee on top of fee on top of fee just for them to tell you "sorry its broken, buy a new one" when the fix was just plugging a loose connector back in...

[@cmonkey63]

It's all reassembled, but 8 minutes to go. What went wrong? I ask myself. Then the suggestion to make a new switch cover. That was a mymechanic moment of the day. In that channel, he often has the text, "I make a new one". Love it.

[@domasia01]

Amazing. Making new knob absolutely fantastic.

[@marquisdecarabas1312]

Very Nice..i always get sentimental if seeing the Telefunken logo. My Grandfather worked there as a chemical laboratory assistent back in the days. I still have some Telefunken tubes in my VOX AC 120 Guitar Amp from the early 70s. 😁👍

[@wildfrank]

I am always stunned by your knowledge and dexterity!! It is always such a pleasure watching your work!

[@leandrogerardo9521]

The one screw on the tape deck was a coutersink, signs someone else has been in there before. Great video.

[@rawjusticeman3128]

Mark, you are just simply incredible, you make replacement transformer ( for the monitor repair ) and now you even make the replacement switch !. Other engineers if they encounter such similar broken parts, they would have simply just gave up with the excuse - no more spare parts !. But you are different, you just fix everything and restore them. Just love watching your videos and a subscription for you.

[@wiktorm5839]

Don't blame other engineers, please. It's a matter of tools availability in a workshop, not an attitude. I'd rather call Mark kind of artist in his craft

[@IsItFood]

Wow, genius, and that knob turned a repair into a complete perfect job, must have been super satisfying and the owner was sure to be overwhelmed.

[@Mr-Maverick]

The electronics whisperer. Love the perfection. This is next level stuff

[@vissalmathew]

Super. Down to the last detail. Manufacturing the knob was a bonus.

[@TheBudgie29]

A Lemon Cake, a mug of sweet Coffee, and fixing a Boombox from back In the day. What more could you ask for on a Rainy Thursday Afternoon. Keep 'Em Coming Mark.

[@maxegarots1507]

Amazing video Mark! The machining pushes this repair to the next level.

[@hardware4200]

Been watching your videos for about 3 days now. I am a amateur electronics hobbyist. That being said one of my reference monitors started to flake out on me. I pulled a "Mark" and ripped it all apart and noticed some solder joints, and I freshen them up, cleaned the connectors and then tested for a while. And wow. it was fixed. You're an inspiration, its amazing the level of detail, troubleshooting, and creativity you show in your repairs you share with us. Thank you.

[@fretlessfender]

Good job again Mark! The trouble you take to mend a humble radio/taperecorder. .. Just amazing...

[@mikeonfreeserve2926]

Worth good money now £200+

[@edwardcat5247]

i'm remembering all this stuff i did back in the 80's, there was only one way of learning then... i repaired anything at all... tv's, audio, kettles, toasters, vacuums, all loearnt from scratch... all worth money then before the chinese throwaway started in early 90s.... no internet or google to learn from... you just did it... slowly but surely learning... so many of this little sub-routines I'd forgotten. Brings it all back.

[@gasgas2689]

. . . yes indeed, including learning how to get an EHT shock from TVs. 🤭

[@samuelpool4335]

Hearing Jupiter by Gustav Holst did my heart good, my absolute favorite classical piece. Awesome job getting that cool old tech going again!

[@shaunmorrissey7313]

Mark you are a true artisan and an exception to the "jack of all trades" rule.

[@keithwhisman]

what’s really impressive is that both antennas are still attached and in good shape.

[@Ryan96se]

what a pleasure it would be to go over and learn a few things from a neighbor like this.

[@jimsimpson1006]

Fabricating that new knob was brilliant! You, sir, are a steely-eyed missile man. 😊

[@PADR]

You have the patience of a saint Mark! Great job.

[@marcelpost4052]

And he has a fully equipped metal workshop as well! Whoa.. You sir, have just risen to the top of the ranks of awesome people! :-)

[@psyclobe]

I am in awe over the power you yield over electronics

[@winstonyeung1461]

Mark, you are one of the best electronic doctor in KZbin. Salute.

[@POEMS466]

And you made a new switch cover. You are The Boss!

[@RGD-Games]

Awesome work :) Hope this dude gains a very high sub count :) The work he does is consistently brilliant... Ive just started electronics repairs as a hobby, and learning as i go. Wish my knowledge and skills get as good as this dude, in the future :)

[@igropemotoko]

What a flex. Watching in awe, an electronics repair guru. Guru then busts out a milling machine and lathe.

[@chrisbartram3034]

Brilliant work, the new switch cover is just a perfect finishing touch.

[@bunston1000]

I had two CR 100’s many years ago. Completely different beasts to this one. They were made by Marconi, and were 100khz - 30mhz communication receivers. That was the start of my amateur radio / ham radio hobby. How things have changed. Thoroughly enjoy your videos Mark, long May they continue.👍

[@moristo]

On 1990s I often repaired radio cassette tape like that, you make me remember back to those good times.

[@MrKillerno1]

I had opened a lot of tv's, radios and other things in my younger days, and I always tried to find the thread in the plastic where the screws were. On a few occasions when a repaired item came back from factory, they did not do that, they made a new thread in the plastic, causing it to become brittle and would give away, breaking the screw from the plastic. This method I tried to bring to my apprentices over the years of network- and system administrator. Sometimes it is hard to see that not every repair guy or girl keeps track of threads for screws. Hope you do!

[@eltallerdezela]

Mark, I just want to say that I've discovered your channel a few months ago and I'm amazed with your repair videos as well your good mood all the time!! Thank you so much!! My grand father had the chance to get one of these bomboxes directly in Germany during the 80's, but the brand is 'Sound 4010'. It's basically the same but with some minor differences in the faceplate as well radio dial. Belt kit replacement and a nice clean, with also a Bluetooth small module, and it's back to life! It sounds amazing!

[@alphabeets]

Very impressive final touch, Mr. Mark! ❤

[@mistersunny3636]

Huh! There is a real 2-way speaker in in. That´s impressive! Great video, thank you for your good work! 👍

[@philthehmk8752]

Excellent work as always. Just a couple of points from my own point of view...I try to avoid cutting the print track to isolate chip pins. I always suck all the solder from the pin and its pad and then manipulate the pin to centralise it in its hole with forceps and/or a very small jewellers screwdriver so that it's not in electrical contact with the surrounding copper pad. I then solder a small wire to the actual pin and another to the nearest convenient solder pad to make a test connection. This saves marking/damaging the original print track and necessitating bridging repairs later. Regarding solder bridging on cut/broken print track, I tend to solder a a fine bus bar wire link across broken print track for mechanical strength - it's the way I was taught back in my C&G college course days. The fault clearing after removing and replacing the transistor is a strange one, as I couldn't spot any solder bridging as such, so it's just remotely possible that the transistor had a junction fault that was cleared when it was heated and manipulated when removed. I had a similar fault a few years ago with one of those back to back 3 legged varactor diodes in the FM tuner section of an old JVC boom box, where manipulating it cured the fault and it carried on working for years afterwards. Keep up the great work and excellently filmed and produced videos - you're one of the best!

[@richardboyce4921]

great repair Mark, you are amazing. very skilled across many disciplines. Thanks for the videos, entertaining and informative.

[@rayofcreation3996]

Boy! What dedication and passion to his profession. Amazing indeed. Thanks for the inspiration. 🎉

[@GeneSavage]

I admire both your knowledge and skill to fix these things. As a child, I was great at taking radios apart... it was the putting them back together again I never got the hang of. I also learned after a while that my capacity with a soldering iron was nil; I would solder all over the room, but none on the actual connection! While I wish I could do what you do, I can still watch and appreciate your efforts to bring electronics back to life.

[@THOMMGB]

Mark, I get the strong feeling that others have looked for some kind of fault, but you with your thermo imager figured it out and found the problem. I love that nothing seems to faze you and that you’re able to use your extensive knowledge of electronics and basic problem solving to get your Telefunken boombox up and running again. Loved it when you made the missing knob from scratch. Just be thankful that I’m not your next door neighbor. LOL! Greetings from Southern California, Thomas

[@TexTom1981]

Damn...the repair was above and beyond....and THEN you fab a lever cover. Fantastic!

[@tsherbert1]

Mark, You are a man after my own heart. I do repaire on music equipment and always do a little bt extra to make sure i an satisfied. I love you channel and approach to diagnosis. you have taught me a lot. Keep up the good work!

[@Radiocruncher]

Awesome job Mark. Great bit of fault finding and the switch cover you made really set it off well. Lovely boombox. They don’t make them like that anymore. Cheers Graham

[@texasmopar5557]

I knew you were an electronics genius. When I saw your machining skills I was not too shocked. Masterful crafting.

[@Peter-kj5nr]

Just wonderful to watch! Thank you so much Mark.

[@skip1835]

Watch ya all the time Mark - in my book, you're always amazing, this boom box project is no exception - even the knob! - fantastic - love the vast variety of skills you possess and bring to these rejuvenations. Thanks for giving us the perfect "bird's eye view" throughout all of these interesting journeys you bring us on.

[@chrismaton01]

Mark seems just the bloke to go out with my mates and me for a drink. Might get a freebie on my Sony MiniDisc recorder!!!!!

[@keithneal5369]

Pure genius. Making a complicated job look so easy . Your attention to detail is amazing.

[@Jammerk40]

I like the way you do your video's! And your always happy and smiling! Nice work on the knobs replacement! The radios were the best thing in the eighties!

[@gman83090]

Mark you know what you do is actually good for the environment because it means that this electronic equipment doesn't go into landfill it's actually a good thing that you do and it saves the environment I really like watching you repair this more people should get this done and more people should learn it you're very talented

[@adamdavies163]

Fascinating, particularly the new switch cover. All the best Mark!

[@chadlunders4898]

The knob was really bothering me and then Voila! Excellent work!!!!!

[@jacknjill3000]

Glad ppl. are repairing boomboxes and vintage stereos. In 1979, I had the top of the line Sanyo M9994 boombox and Corte like $270. US and loved that thing. I just saw one listed on eBay for &3,000. and suppose to be one of the top 10 classic boomboxes it was on the cover of Malcolm Mclaren’s Buffalo Girl’s album from the 80’s. Also I used to plug in a turntable and sounded like a full stereo bc it had a built in phono input and pre amp. Anyway, most boomboxes need new belts being sold and you can still get them cheap bc not many know how to change the belts.

[@sebastiansekinger5070]

I love the way you bring these good old machines back to life, excellent video!

[@miffyLake]

Oh my god, wireless worker, you actually started a lathe. That's really fun!

[@NOWThatsRichy]

Just found this channel, That's a superb repair, that looked like a good quality stereo, the way it came apart, with each section able to be unplugged fairly easily. Unlike many of today's un-repairable items which are glued or clipped together! The cherry on the cake just has to be the manufacturing of the replacement switch cover, great bit of engineering!

[@langerstrains9460]

Nice fix and a special treat at the end with the switch cover. Enjoyed watching 👍🏻

[@wagsman9999]

From electronic to metal working in one video. Very impressive indeed.

[@johnnycats5157]

love that you machined a brand new knob

[@Choober65]

I recently fully restored a 41 year old Hitachi TRK-8290E. Works as good as new, looks as good as new.

[@pa3byw]

Nice demo of a great radio. I have one here and it's my favorite radio. I've repaired the PTO and build in a new sidetone oscillator because I did'nt like the sidetone. I'm an CW only operator and like all features. QSK is great. Nice to have a audio filter and the notch filter can be a great help too. On the lower bands I usually back off the RF gain or use the attenuator. Hope to meet you! 73 Durk PA3BYW

[@paulb4uk]

Superb work mark and even better you made that missing cap that really finished it off .

[@jeffhansman2829]

Brilliant troubleshooting and fabrication to boot! Your body of knowledge is truly impressive.

[@franklekwan5860]

I really like these kind of "boom box" or big "portable" cassette recorders of the 1970-80. I used to have a Sharp dual cassette boom box which accepts 10 size D cells. I bought 10 pcs of size D Ni-Cd's for it so that I can bring it to camping and beaches. If I have learnt that someone can repair these equipment like Mark, I would have keep it.

[@Super8Rescue]

I binge watched your channel for four hours yesterday! It takes a brave man to open up a boom box that's for sure. I wish I still had my Sharp GF9191 Seriously impressed that you made a new knob on the lathe, very cool indeed.

[@First112]

That knob making was icing on the cake for sure!

[@2steppa3]

I have a 9191 - lovely radio for sure.

[@Robert-bd4mb]

Mark. Really enjoying your repairs with tips included. I was in this business for many years but retired now. In my 70s now but still fondly remember out on the road in a company minivan then a mk1 Ford escort wow. Any way carry on the good work. Cheers.

[@KevinJohnson-je1pe]

Hi Mark I have been watching your channel for quite some time now. I must say when I saw this one it took me back a few years as I had that same radio. Thanks Mark and keep up the great videos. Kev

[@darrenwendell1723]

You've got quite the tools in your workshop. Well done.

[@danilozanata1673]

So relaxing to watch

[@gasgas2689]

In 1985 I worked in a R&D lab designing and building new comms products. When we first turned on a new design prototype it didn't work. The problem turned out to be right angled pcb tracks. The high clock frequency signals were not making it round the right angles, instead just shooting off the track into thin air. We had to redesign the pcb making bends as gentle curves as we could, thus keeping the clock signals on the board.

[@TheFlyingBusman]

Countersunk screw on the cassette mech suggested someone had been in there before and the fact that a 40+ year old cassette deck actually worked was the real giveaway. Normally the belts would have been goop by now. Nice job.

[@danmyname]

Wow, Mark, I mean just wow. Excellent work.

[@griffingriffin202]

Keep up the good 👍 work please 🥺🥺!!!!

[@michaelmitchell8218]

Only just found this channel, your like me in doing electronics repairs. Most channels I do like on here but this one I do. Your a nice person and not a big head, I done electronics for 35 years and I find on your way in this subject you meet big head or people who don’t know what they are talking about, has it been the same for you? Anyway nice to find a channel with someone being nice and helpful to the viewers. Nice one mark.

[@kelavpp]

Brother, you have veeeery thick nerves doing all that tedious job - I admire you! Very good job, thank you for sharing it with us. Keep up the good repairs my friend...

[@drummerhammar]

Not only good with electronics, but just as good with milling and lathing. Real champ!

[@rajvindermanku825]

Hi there Mark i had this exact boombox when i bought it the right hand chip was faulty, i recapped it and replaced the right hand chip along with servicing the tape deck, this was working perfectly for over a year then i sold it on.

[@MendItMark]

Wow! What are the chances of that? Did you change the belts also? I didn’t expect the tape deck to work!

[@rajvindermanku825]

@@MendItMark I know i was shocked seeing it here lol, i bought the amp chip from the same place you did, yea i replaced the belts as the old ones had melted with age as they do, the caps i buy from CPC, started watching your videos a while back keep up the good work, i repair old vintage audio equipment as a hobby love getting these old radio's or amps working again as the don't make them like this anymore. That Telefunken is a decent radio with plenty of power.

[@robertjones8856]

Wow..the video is great. At the end when Mark jokes with us about the knob, then like it's no trouble at all begins to fabricate one 🤯. Just amazing..a pleasure to watch, Marks' a true professional and nice with it. Best wishes everyone 😊

[@RockNRoller66]

I liked the tinnitus test tape you popped in before the Hole. I'll be hearing that one in my head for a bit. Real catchy!

[@zik316]

Your level of craftsmanship level just went up to 11 with that one. I'm a new subscriber and will continue to be so after this restoration!

[@Djrabj]

The button cap was amazing pal 👌🏻

[@DougPowhida]

You have patience I can't ever dream of. Thank you!