1957 Telefunken Opus 7 Repair & Bluetooth Mod
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- Опубликовано: 22 ноя 2023
- UPDATE:
I’m running a 3-part live workshop that takes us on… ’A Time Travel Through Vintage Electronics’
We’ll dive into the tech of the times, from the 1950s all the way to 2020s.
The dates and times are still to be confirmed. But if you're reading this, then the workshop hasn't yet taken place.
If you're interested and don't want to miss out, you can sign up here:
menditmarkk.ck.page/6e8fbd9521
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Mark repairs a 66 year old Valve Radio, made by Telefunken in Germany. It was certainly a high-end item in its day, but had acculated quite a few problems over the years. Mark also installs his Bluetooth Interface Board inside, bringing it into the 21st century!
I want to try something new. Something more live.
So I’m running a 3-part live workshop that takes us on…
A Time Travel Through Vintage Electronics.
We’ll rewind the clock, dive into the tech of the times…
(and study the very history of how things were broken and repaired has evolved)
From the 1950s all the way to 2020s.
It's still just an idea. The dates and times are to be confirmed.
But if you're reading this, then the workshop hasn't yet taken place.
So if you're interested and don't want to miss out, you can sign up here:
menditmarkk.ck.page/6e8fbd9521
Das ist großartig, Mark!
How on earth did you acquire such intricate knowledge of your subject Mark? You surley must have started when you were very young. With your enthusiasm for the work, you make it look so straightforward but to be able to identify faults amongst such a hornets nest of components is a truly gifted talent. Your videos are an absolute joy to watch.
The confidence of Mark is unbelievable, an example of an expert who smiles when something goes wrong.
Reminds of my childhood. The sound, the smell, the broadcasts. Great piece of history.
What an absolute gem to restore to beyond it's original capacity. Awesome work Mark
Always a great night when Mark gets a new video out!
Yes indeed !!
Especially as it’s an hour long
bro it sets up my whole evening, sit down and watch MendItMark with a cuppa - love it @@king_ofgames3650
The best way to go to sleep !❤
IKR@@PuiuM3u
There's nothing like the glow of a magic eye. Brought back memories of when my late father used to repair these. Thanks Mark
And his Jap's eye as he waved it under your nose.
Mark makes working on electronics like tying shoes. He has such a positive demeanor when approaching a electronic problem. If only World Leaders be more like Mark 😊
I remember as a teenager in the 1970s being given a Grundig reel to reel tape recorder . It was enormous and the most complex mechanical and electrical monster I'd ever seen ! It was built on a cast iron chassis , and all the piano key controls operated solenoids that in turn pushed and pulled all the various pinch wheels etc on the deck . It had a total of 8 valves ( tubes), and a huge finned selenium rectifier on the power supply unit.
It was only mono , but the built in speaker was huge, and the microphone was a very heavy ribbon type. All it required was the heads and pinch wheel cleaning and it worked perfectly.
The neighbour who gave it to me said it was from the very early 60s ,and cost the equivalent of around £ 200 when new ( bearing in mind this was 1971 and a new Ford Escort was about ? £750 at the time!
You made a fantastic job of that Mark, especially with the Bluetooth added to it.👏👏👏👍
Donnez-vous des cours?
Je rêve d'avoir un si bon enseignant ici en France et avec toujours une si bonne humeur 🙏🥰🇫🇷
Best electronics repair channel on yt by far. All the best Mark.
Man, they don't make 'em like they used to... and good thing too. The transistor completely transformed electronic gadgets and made today's computers, internet etc, possible. Another great video. Excellent presentation and technical knowledge as usual. :)
If I had that radio, I'd just have to try those speakers with a stereo amp and hear what they sounded like. Imagine stereo sound from that classic radio!
I know nothing about electricity or electronics, but these videos are fascinating! Thank you Mark, always a pleasure!
i know quite a bit, but it facinatings me too 🙂
My late Father had 1 of these radios at our home in Essex...I think it was Bush but looks identical. I am in awe of your knowledge, skill and patience.
In the mid-60s, my parents had exactly this Modell.Es was in our living room.I did an internship as a radio and television technician in 1976 and repaired the radio more often than it was defective. Greetings from Germany.Thank you great video
A lot of the German made radios had a lot of features like this in this era. They were made so well too.
Lovely radios when you get them going. A lot of the paper caps and electrolytics in the filter will be needing replacing in these, but it is always good to see some proper trouble shooting done instead of just wholesale replacing the capacitors. A lot will be like this one and not operational due to the capacitors and sometimes resistors that drift in value. Those old paper capacitors go acidic inside and the paper breaks down,. They basically turn into resistors internally, which is why a lot of restoration channels will just replace all paper caps. The "Black Beauties" are also paper and foil inside. Guess it is hard when you are doing it for a customer to know how far to go as it takes time.
The Ferrite rod in this likely originally had rubber mounts and plastic brackets that held the ferrite rod in place. Epoxy will stop it moving for a while.
I usually put the bluetooth on the tape input on these when I do them. That way the bluetooth only works if tape input is selected. I designed my bluetooth module to run off the 6.3V AC heater line rather than adding an extra transformer :) There is usually plenty of power available and the bluetooth takes very little current.
its unbelievable how the circuits were constructed without circuit boards it all hangs in the air .. brilliant repair!! nice work
My dad won one of these in a contest in the 1950s. I used it the most (dad had a tin ear), and this brought back a lot of memories of listening to this gorgeous machine before real HiFi came into vogue. Now all we have are smartphones and bluetooth ear buds. Blah.
31:58 Your initial repair brought Hall & Oates back together! Love your channel. Cheers from Canada!
If you ever need dual can caps, they still make them. I service tube amps and regularly order them. Usually from Hotrox or Watford valves. JJ, F&T and ARS are all decent and always available. Excellent video, as usual!
Mundorf make twin caps with a common ground pin too. Think it's the MLytic HV range.
It’s a real joy to watch someone with such competence go about doing their work.
You cannot beat UK electronics engineering channels, so relaxing and informative. Big Thumbs Up.
Great to see another cheery journey through old tech with Mark. Great content - thank you!
What a clever chap you are Mark. Even thought I don't understand electronics I still really enjoy your content. Brilliant!!!!!
And me. 99% of the time I have no idea what's going on, but that doesn't mean I don't find his repairs/restorations fascinating! Mark certainly knows his stuff.
Questi sono i video che più mi fanno amare sempre e per sempre l'elettronica, ma questi video di restauro su valvolare sono eccezionali.
Grande Mark 💪🏻💯👍🏻
Cool old radio given another 66+ years of life and Bluetooth! Imagine what the Germans who build this would say about the BT tech. Nice work Mark!
fantastico trabajo!!!! yo aprendi con valvulares en 1982 aqui en santiago del estero al norte de argentina a los 16 años. me trajiste hermosos recuerdos de esas epocas ... hoy ya etoy casi retirado del oficio a los 59 por la vista y la firmeza de las manos. pero el amor a la electronica no se va mas...me especialize en computacion a los 45 años y eso me permite prolongar el vicio que es la tecnologia electronica.celebro que todavia haya gente como vos que trabaje con cosas de epocas antiguas electronicas... saludos desde el norte de argentina mark de un colega que se niega a retirarse...
As always, a pleasure to watch Mark. You really brighten up my day. They sure don't make them like they used to, in many ways it's so much easier today.
Fantastic Mark one of the more challenging projects you have done and certainly one of the more interesting ones too. It amazes me just how knowledgeable you are nothing seems to upset you and you keep coming through with results. keep the jobs coming Mark you have a very loyal following we continue to need a "fix" from yourself. Take care.
Mark has steady hands laying those micro parts in position. Amazing intelligence Thank you.
Wonderful upload, thanks Mark. I really enjoy wizards like you bringing these old gems back to life.
Really nice Radio and well worth the investment of the work carried out........Made in West Germany those were the days.............
bonjour de la France mark ,je connaît strictement rien en électronique , quel patience ,et quel savoir faire ! vos vidéos sont excellente et passionnante a regarder ! tu a gagné un abonné.
Марк, вы великолепный мастер своего дела. Всегда улыбка, несмотря на некоторые вещи что идут не так. Спасибо вам. Всего доброго семье. Привет из России 🇷🇸
Always find these videos soothing.. a professional doing a professional job with utmost pride in his work, and some bonus ASMR from the various screws and stuff being removed 🙃 Really high quality content.
its all well over my head but I can see just how smart and talented Mark is at his trade, well done Sir and cheers from NZ
Congratulations,friend Mark. I from Perú.I dont speak english. Y me gusta como abordas las reparaciones,con tu carisma y toda la instrumentación profesional. Dios te bendiga. God blessyou.
Digging around inside that old radio, snipping away, reminds me of that incredibly fantastic British film called 'Juggernaut' ... that's the film where a Royal Navy bomb disposal squad has to disarm several time bombs on board a luxury liner at sea... just brilliant ... at least you didn't get to the end of the repair and have to decide which final wire to cut to disarm the thing... the red or the blue? Be careful... the wrong decision will blow you sky high 🙂
To tell you the truth, these high voltage tube radios scare me. I once got a nasty shock from one of these things, and I haven't been a fan since. Brave Mark.
Omg I just found your videos , my late father use to repair TVs radios ,all those names and the components you mention brought back so many memories of when I use to watch him as a child ,im now 59, btw your knowledge is amazing how did such a young guy learn all about these old period sets , thanks great watching on a Sunday afternoon
Mark, lovely old radio! I've collected vintage valve radios for 14 years, and what I've found is that initially when a radio is turned on after many years of slumber, it'll work okay for a while, but then the old capacitors will short or go open, sometimes explode after an hour or two's usage, so that's why it's advisable to replace as many caps as possible, even the low voltage ones!
Mark, you make it look easy, but obviously you are one talented man 👍🏼👍🏼👍🏼😎
Your knowledge, skill and cheery banter make you one of my favourite you tube channels! Thanks Mark!
I have one at home right now, better shape than the one of the video because it works when i turn it on but i'm going to give it a little clean up maybe change a tube or two and try to set up a bluetooth mod with this video as a guide :)
Mark, in the early sixties I was an apprentice Radio and TV engineer. The two contact cleaners the company used were cans of ‘Servicol’ and a smaller plastic bottle of ‘Electrolube’ (“Go sparingly with that it’s a pound a bottle”). Does either product still exist? Great channel Mark 👏🏻👏🏻👏🏻
Beautiful work, Mark!
You Wizard 🎉🎉🎉🎉🎉 Enjoyed that ! Well done our Mark , if I have a project for you , you maybe hearing from me 😃😃
That's my Friday night viewing all taken care of. This is a nice long one, roll on Friday.
28:42 I was surprised the coupling capacitor for the bass speakers wasn't a non-polarized type.
All-in-all a fantastic rebuild. It seems when you fix something, *it's fixed!*
You can use non polar caps for small and large signal coupling with no issues, as long as the offset voltage across it is a good bit lower than the cap's voltage rating. Polar coupling caps will introduce a tiny amount of distortion... In this old radio it wouldn't be measurable compared the amp and speaker distortions.
Wish I had the electrical skills of this guy very few people any where have this talent.
My Parents had an unusual Philips radiogram in the 50s & 60s that had separated individual Bass & Treble speakers. With a record player in a cabinet. Unfortunately I no longer have it. It did have a good sound. I think they bought it in Holland, we lived there when I was very young. I wish I'd kept it now, it was an unusual layout. Not as sophisticated at the one you're working on. My mother used to play Sachmo 78rpm
Recordings in it.
Bloody brilliant Mark!, great job. What a skill set you have!
I’m fascinated by this, there used to be a fantastic wood cased radio where I served my apprenticeship it had a round front with big wooden louvres and a vertical tuner array along with the magic eye. I used to think about replacing the internals with some modern hardware and have a radio with what looked like a 1940’s American car grille.
Dude, your work on the jam box 📻 was amazing. The fact that you customize pieces - so cool!
I can smell old electronics and melting solder resin from here 😄
Me too, and I'm in Melbourne Australia!
What a Mess ! It is like Roger Moore working on a Bomb in the Movie Juggernaut ! We had a Greatz with Sound Kompressor ! A Kind of Horn with Pipes, an lots of Chassis with old Form of Equalizer. Long ago, an old Radioman overhauled it totaly and i was his young Assistend...with 8 Years ! It is still working and in good shape in the old House of my Brother. And it has a Special.....A small black Skelleton with green diabolic Eyes ist dancing,at the Front of the Whoofer.
You did a good Job, Mark, without getting flashed ! What a Beauty ! Kind Regards from Germany...Rudi 😉
I don't think I have ever witnessed a better electronics repair job ... Outstanding , Mark Cheers
Excelente video, saludos desde Tegucigalpa ,Honduras
1:24 ist for an ext. Speaker, yes Mark. 🙂
It is an classic German Radio with German Letters.
You really are the man Mark fantastic video please keep them coming.
I could go into deep sleep... every time i listen to Mark ... the broken electronics whisperer.
watched one all the way to the end. quite enjoyed it until I was told I would have to watch the next one to find out if it was successful ! bye.
I worked as a bench technician at a radio shop in the late 60s. All we worked on were German imports. Grundig an Telefunken were the predominant brands, but we would see a Saaba now and then.
I haven't a clue what what your talking about but I look forward to your videos.
Amazing radio. I have the 1956 American version, different colors and the 4 smaller speakers are mounted on the side. Still all original, still gets played a few hours a week. 😊
Absolute.electronics fixit heaven. Thank you.
I love the adjustable ferrite rod antenna!
My uncle was the agent for these in Cape Town I remember seeing one in his repair bench I was just 6 yrs old - inspired me to unscrew everything in sight become an it audio engineer
Rio de Janeiro- Brasil. 👋👋👋 você é um gênio. Parabéns👋👋👋...
Your style of presenting things is really something. Its so enjoyable to watch your videos. Thank you!
Great video! Those old radios sound wonderful!
I have a Philco Transglobe that I enjoy listening while having my 5 o' clock tea!
"Thanks(for)giving" us another stellar peak into your brilliance in the workshop.
I'm glad you were able to revive Grandpa and install Bluetooth for him. Thank you very much.
Hour long... Now were talking 👏👏👏
Fantastic Mark, adding bluetooth to this old equipment really shows your genius. I enjoy to watching your greate videos
Just for all who are interested in this: Volkswagen actually produced and produces only commercial vehicles in Hannover. The other main production location is Wolfsburg (sometimes also called „Golfsburg“ because of the quite famous VW Golf line of cars; a city that as a matter of fact only became one because of the factory). The actual first factory was build in Braunschweig though.
Well done Mark saving something ending up on scrap heap I am a bit like you I try to repair them if can to much ending up on the dump good video great repair
चाळीस पन्नास वर्षांपूर्वी ज्याच्या घरावर मंगलोरी कौले ,सायकल, रेडिओ, म्हणजे खूप मोठा माणूस समजला जायचा.भारत.
I've gotta say, that's one of the prettiest pieces you've had on your bench.
Hi Mark, I'm using the VHM-314 MP3 BT stereo BT module - it's in BT5.0 version and doesn't bother with any messages, but your solution is perfect 👍
Nice day 🙂Tom
Superbe video!!! I am an old man and I remember these. They were expensive and very good. Cheers from Patagonia. Argentina
A fine choice of song to initially test the bluetooth board on an old West German radio! Love your content Mark.
Glad I wasn’t the only one that spotted it!
My Mrs recognises the opening music when I start a video she always makes me go back to the start so she can see you get a shock 🤣
great work as always Mark, keep it up 👌🏻
That's what I like about old radios, you look inside at a wonderland - unlike the single chip and one or two surface mount components I have seen on modern things, they have no soul. Most enjoyable, thanks for sharing.
Brilliant. An old Opus repaired and upgraded with Bluetooth! ❤
Thanks for sharing your know how, and taking a 60+years radio and give it one more life of making music.. and demonstrating at the same time how precious thes old technologies were.. and they were within reach of the people who wanted to learn about them and repair them, right at the corner of the street, nearby.
Now, try to open any recent Dac or Streamer and see if you can get it to work again.. my EAD Dac just died, and no one can repair it.. sigh. Thanks Mark! 👍
The first time I electrocuted myself was working on a tube based entertainment unit of about the same vintage. Had a 78 record player, my first. Tried to fix what I thought was a bad speaker connection, ended up with one hand on the speaker body and a sweaty hand on a screwdriver. Tool slipped and I reckon I got 300v through my upper body. What saved me was I was standing up at the time, so I was able to lean away. Had I been sitting I wouldn't be typing this now. I was 16 at the time.
You are so cheerful even when faced with a mess of failing capacitors.
Watched this with fascination, because although I'm not technically minded, the assurance displayed here made compulsive viewing. I do like restorations, and this one fitted the bill perfectly. Thank you Mark.
Nearly choked when you put the neutral on the fuse until I remembered our British plugs are fused. Very nice work.
first class work Mark,well done..and a really nice piece of vintage radio..great video.
You are awesome... Thank you so much for sharing the knowledge you have... 👍👍👍
When I was taught, I was told it's best practice to cut the component leads to length BEFORE soldering them. That is supposed to avoid the joints going dodgy down the line. You cover the cut end with solder and it protects it.
You really are an amazing technician. Love watching your videos.
Mark you are very skilled at repairing, restoring and adding Bluetooth to an old Telefunken German made radio. Between you and "Paul Carson's Lab" of Vancouver Canada, both of you are among the best electronic technicians on RUclips!
Electronic engineers :-))
That is true as well.🙂👍
Great job Mark. I restored an old Selmer amplifier recently and Watford valves had quite a few dual can electrolytics in their stocks.
Гарна робота, як завжди.
Сподіваюся, цей апарат прослужить ще довгі роки своєму власнику.
Absolutely wonderful and the icing on the cake was listening to Andrea at the end of the video.
A very nice great repair. I like it. But let me give you one advice: these brown metall-paper capacitors (Brand ERO) are really bad in general after 60 years. Especially when used as a coupling condenser their leakage current may even destroy the power tubes and/or lead to damage of the speaker transformer due to increased bias current. (One end of the coupling condenser goes to Anode of the preamp stage leadind 150V, the other lead goes to control grid of the power tube which has -7,5V in respect to the kathode of this tube. Any little leakage can cause a big problem) So i don´t take any risk at all, they go to the garbage bin first before I just even think about to put power to the radio.
Testing them on a insulation tester they all read bad, because the tar seal is cracked and the paper dielectric has absorbed moisture from the air. You could try to cook them in wax, driving out moisture, but the result and sustainability is quite questionable. Modern foil caps are just much better.
And there´s another spot where such a 5000pf ERO can cause serious risk of electrical shock. It is connected across the chassis and one of the power supply conductors.
I'm not sure about the situation in GB, but in Germany it is possible to insert the power plug in any orientation. Therefore the mentioned cap can either be connected to N or L. Nowadays a X1/X2 safety capacitor would be required on that spot. The reason for this capacitor at all is to ensure good AM-receiving quality, when poeple were lazy to connect the ground wire. Many people understood the necessity of an antenna for radio reception, but they did not understand the importance of a good ground connection as a counterpoint to the antenna. To avoid annoying complaints, many manufacturers decided in favour of this capacitor.
For the radio waves, it doesn't really matter whether you use the L or N wire as the aerial opposite pole. But it's no fun for people if this damn capacitor fails and the chassis is now at 220V potential.
As a safe solution for my projects, I have decided to remove this capacitor without replacement and instead use a three-core mains cable with PE conductor and establish a safe connection between the chassis and PE. The local safety regulations must be observed here. Remember: not only you, but also people you love want to enjoy the radio.
With best regards from Germany
Peter
I think UK sets did this too with the Earth.
People who really know what they’re doing make their work look easy.
'wow - am well impressed with your knowledge of all things electrical - very entertaining too - one of RUclipss hidden gems!