1970s Stylish BANG & OLUFSEN Beomaster 1900 with Numerous Faults

In this video I attempt to repair a stylish 1970s radio amplifier from B&O. The BEOMASTER 1900 was understandably a very popular item, but you would have needed deep pockets to buy one of these 45 years ago. It still looks modern in 2024!!! A piece of stunning design from the Danish manufacturer. I purchased this faulty from eBay and it has multiple faults to work through, but the main fault is audio only on the left speakers, the right hand side is silent.
Can it be made to work again. Let's find out.
If you would like to support these videos, please click here / mymatevince
Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince.

[@harryjones5260]

still remember that morning in 1979. aged 6. dad makes the tea and passes me the Beomaster 2000 brochure. whispering "we're getting one of these. DONT TELL YOUR MUM" my excitement knew no bounds. the future had arrived.

[@El-Ritmo]

"What are you doing?" "Just watching a barely moving video of a man trying to get a bit of string around a small circle of plastic." "You what?!" "Best stuff on KZbin this. Now shush, please." 😁😆 Cracking fix, Vince. I have absolutely no use for one of these, but I really want one now - your enthusiasm is infectious.

[@Mymatevince]

🤣🤣 It is lovely. I've been listening to it daily since, to the misery of my kids!!!

[@dash8brj]

These B&O sets still look smart today compared to all the plastic junk they sell nowadays. Good on you for saving it Vince.

[@cheifwhat]

Yeah, then he goes and repairs a bunch of stuff by the mighty "Bush"

[@faithless8888]

Hi Vince. The green “arrow” looking lights under the huge tuning dial, are not just for decoration, or to indicate stereo. They actually tell you, how to fine tune your station. If for example the left arrow is brighter that the right, just move the slider slightly to the left. You will see the left arrow decrease in brightness, because you are tuned in properly. Nice repair by the way! 🙂

[@Mymatevince]

Thank you, what a nice little touch. I wasn't sure how it worked. Thanks for telling me 👍

[@samuelfellows6923]

Similar to an “FM tuning” analog meter in vintage receivers = the resting position of the needle is in the middle of the meter, when tuning into a station the needle would deflect to the left/right on which side of the scale you were tuning into, and when centralised with the station the needle will [again] sit in the middle of the meter

[@2705fie]

hello from Denmark, I have worked as a technician for more than 40 years from 1967 repairing B&O's products, also beomarster 1900 I have e.g. converted a BM1900 to a BM2400. you bought the components at the B&O factory and built the print from scratch, when it became a BM 2400 it had a remote control so that all the functions could be controlled, this was with ultrasound which B&O used at the beginning also for TV. it is important that you wonder about the small round gizmos you find on the printed circuit board when you remove the metal bond, it is important that you put them back in as they must prevent the metal bond from being pressed onto the printed circuit board and short-circuiting. Another thing in your previous video with the 1960 radio you have put the scale cord the wrong way around the scale wheel, the arrow on the scale goes the wrong way when you turn the knob.😮

[@nelsin1925]

I'll say it again: Never change how lo-fi your videos are. I have been with you on and off again since go, and I really like that you have not changed.

[@JulesN580]

Ah memories! Picked up one of these in 1990 -with matching tuner/receiver, turntable and speakers in perfect nick - for $150 at a Richmond garage sale. Man l loved it!

[@MrAsBBB]

I’m 55 and did the first ever GSCE in electronics and then got sponsored to do my electrical engineering qualifications. You should be proud of your fault finding expertises. It can be applied in so many environments. This should be taught to children. It would make so much of a difference to our world. I spend my working day is spent fault finding in data systems , the trouble is I am the only one able to do it in a company of 20k people. I am so overworked. I train people but they just find it either hard work or just not in their pay grade. All the best.

[@AlexMitchell-sj4sb]

Agreed, they should be teaching these kinds of skills in schools instead of the rubbish they teach them that is usually of no use once they leave.

[@rojhann]

@@AlexMitchell-sj4sb As an Aircraft Tech I was trained to diagnose and repair faults, today they just change boxes and over time they have lost the skills.

[@glengrimm4075]

​@@AlexMitchell-sj4sb 💯 facts

[@devttyUSB0]

B&O always were futuristic with their designs. What a great looking device! Good to see it working again!

[@Mymatevince]

It is lovely, thanks for watching 👍

[@MsNIKITA]

The grey plug is the "BS5733 Masterpiece" a rewireable 3 pin, 6 Amp Masterplugs often used for hifi and home entertainment at one point. Very useful.

[@rc6133]

I had a set of these on my hifi years ago, took up a lot less space than the standard three pin plugs and a four way.

[@EudesRJ]

I saw it quickly on my phone, mistakenly with the Italian plug (type L)

[@themlotproductions]

Beat me to it.

[@janebottomley6852]

Yea l have one with 4plugs got my Xmas lights wired up,goes into like a 3 pin extension lead

[@wheelmonkey00]

seen a kenwood stereo recently that these plugs would daisy chain from the amp, never got round to googling them 😁

[@Longplay_Games]

1970s and 80s design is, IMO, far more futuristic than our current "oh, look, it's a featureless black slab with a web service" design.

[@Hugh-S]

Couldn’t agree more.

[@danpedersen55]

Precisely, and in 40 years time,you haven't got a chance using what they make today, no knobs or sliders and the web interface is not compatible anymore, with the future OS. I'm not a fan.

[@38911bytefree]

But doing this requires a ton of industrial desing. I mean ... the B&O

[@chrisa2735-h3z]

I agree!!

[@snafu2350]

Yup. When do you think the Lambourghini Countach was originally designed? OK, it's horribly aerodynamically inefficient, but it looked seriously futuristic when it was launched.. & still does, IMO!

[@mikeschumacher9715]

Had a couple of friends with these, back in the 70's. I have a fantastic B&O turntable now. Spendy but worth it. In the movie Christmas Vacation....the stereo destroyed by the ice coming through the neighbors window, is a Beogram 9000, Beocenter. Made me cry to see it destroyed.

[@NatureOkie]

Take heart, it was a prop copy wired to short, etc...not a real one. But, cool the set dresser used a real Beocenter as a bedroom radio....

[@jukingeo]

I laughed during that scene. B&O stuff really isn't that great. They break down very easy, they are hard to repair and they really don't sound any better than a Bose system. While the speakers were a bit better, (Many used Seas drivers, but the crossovers are utter garbage), their electronics are really nothing to write home about. It is just overhyped and overpriced stuff. You can definitely do better for less money.

[@123simion1989]

This is a welcome sight for a long term viewer who is ill 🤒 perfect timing. Thanks Vince

[@kevinbarrett2653]

I too am a terminally ill long term viewer. My Mate Vince is a real mate in the wee small hours when p[ain is getting the better of me. Thank you Vunce. Good mates are worth their weight in gold.

[@jackmanatee3162]

In my teens (mid 70s) I remember drooling over the clean lines and beautiful functionality of B&O stereo equipment. Like the Beogram 4000c turntable, a work of art. But alas, I only had a Radio Shack budget.

[@sambuka57]

You can buy the 4000c once more as they are selling them. If you have £10000 to spare.

[@jackmanatee3162]

I STILL have a Radio Shack budget.@@sambuka57 😁

[@Mymatevince]

🤣👍

[@38911bytefree]

The 4000, 4002 .... I was in love SO BAD !!!!!. The catridge / stylus was the only issue to me. It is B&O specific. I think is is displayed at MOMA ? ....

[@RSFred555]

Round object you found loose might be the pokey bits from the rubber feet that have broke off.

[@Mymatevince]

Thank you Fred, I would have never have guessed that, but there was 4 and also located near the corners. Thanks for letting me know 👍👍👍👍

[@TheMatthooks]

Haha beat me to it Fred. That's exactly what they are.

[@NOWThatsRichy]

I first saw a brand new one of this exact model, back in 1977, a relative of mine bought one. When I went to their house, the then 9 year old me was absolutely amazed at how futuristic it looked, with all the red & green indicators & touch sensitive controls, when everything else at the time had big buttons & knobs!

[@TheJensenInterceptor]

My uncle had one of these new and it was really so special I absolutely remember it......

[@TheMcflyster]

Hi Vince! I bought on of these for 20£ and it had the exact same problem with balance. So I manage to fixed it thanks to your video. Thanks man! 👍

[@ralphj4012]

Exquisite. If you can find some slider pots of the same length you may find that you can change the tracks over, then use the new plastic parts, but, as another viewer mentioned, check first whether the pots are linear or log. The TO220 transistor should ideally have a plastic bush (part of a transistor kit) which passes through the tab and the mica washer as this would prevent shorting if the screw wanders, but the workaround is fine. The wandering slugs were a concern. Margot Robbie would clash with your decor, for Clive, on the other hand!

[@andrewmitchell9807]

Mesmirizing to wander through these pre IC hifi classics. Love the QUAD as well. Many thanks 👍

[@andyevans2336]

I just restored one of these for a customer last month, including the matching cassette deck and Beogram linear turntable. Belts were the biggest difficulty in chasing down parts. Still sounds great after 46 years.

[@keithhoughton4308]

I have that cassette deck. Are you happy to share your source for the belts?

[@pauleastham2177]

That weirdo plug is a Micromark plug. Popular with UK audio separates fans around the mid 1980s. You can imagine with Amp, Tuner, Tape, CD, Turntable etc there were loads of mains plugs and sockets required. Using BS1363 plugs and extensions used up a lot of real estate at the back of the "tower". UK homes typically only had one or two sockets per room back then. Micromark nutters (like me) even shortened all the mains leads to route them nicely at the back. Also, mums didn't like to see "all those messy wires". They weren't cheap, but they were really neat.Also remember B&O was top dollar, Micromark was just what a B&O owner wanted. Loving the B&O videos.

[@bramgn]

I appreciate that you show the radio not working after the repair, i wouldn't want to watch a repair video with just successes!

[@jukingeo]

It's a B&O. Witnessing a successful repair is a rarity.

[@glengrimm4075]

Dude I love it when people like you geek out over old stuff like this, I was amazed just how gorgeously made that amp was made. It's a piece of 1970s art, I've owned amps from Yamaha, onkyo, technics, bose and this as basic as it is inside is a marvellous feat from an engineering point of view for the 70s you just know when you see something like this that's so futuristic but made so basic that it will last the test of time. And it still looks like it would suit any household from rent controlled housing projects to a massive mansion. I love companies that concentrate on sound quality rather than large sized amps and big muscle pumping base Where quality is overlooked in the search for high power. Dude I love you work and your videos keep it up, there isn't many people anymore that have the same passion or knowledge of quality audio, even If it is old. But then people like us know that mostly that is where the quality is. Stuck in the past. 👍

[@jamiekent1970]

Hi Vince, that plug you had was from a extension lead hub , i think the one I had was white and had 6 outlets, it was unfused you generally put 13amp UK plug on the other end with 3 or 5 amp fuse in to cover the 6 outputs… they were a lot small than having a 6 way extension lead behind the cabinet.. had mine around 1986

[@Mymatevince]

Thank you Jamie 👍👍

[@stuinNorway]

I had a similar one back around 89-90 but it was based on standard IEC plugs, similar in shape to PC (tower) power leads and kettle leads. That one looks more like the Italian style variation on the European plugs, some of them had a central earthc pin like that.

[@markshellard5894]

Always great to have a Vince to watch

[@dahger7]

Yes it's just a video. But you sir are a benefit to society with your kindness and good heart. It comes out in your videos. You could work on a boulder and it would be interesting.

[@didierdubos]

Thanks for the video. I use to repair B&O (beocenter 9000, beocords..) and I always find these so beautifull and well made.

[@lioneldickerson1550]

Hi Vince, this is an excellent repair and a superb quality B and O amplifier.

[@Smedleydog1]

I remember back in 79/80 a friend of mine worked at an audio store in the mall close to where we lived. Once in a while on Friday or Saturday night my friends and I would go out to eat, so we would meet at the store right before closing. We would play with all the audio candy while they were locking up, he would show us the latest and greatest, and we would drool over it. We were in college at the time and The Bang & Olufsen equipment was way out of my $2 price range.

[@mavis34]

Something that I didn't know existed but have come in really handy are 'RELIFE' PCB repair traces of all shapes and sizes, I'm sure a lot of people would have some use for them. That B&O Amp does not look like something from the 70's... Awesome stuff!

[@ovalwingnut]

My day is looking up. Vince is back (baby!). Now on to the show - and thank you

[@TrueBrit1]

Blimey Vince, that is a gorgeous looking thing. That looks so futuristic now, let alone 50 years ago! Class.

[@robindickinson5376]

Another excellent long video - really love this format - thank you👍👍👍

[@propfiendfpv9535]

I love my mate vince. Helps me through all my technological nightmares. 😊

[@markepps2404]

my dad had one of these with the record deck and tape player plus the B&O speakers. what a setup! takes me back seeing this video. thank you Vince

[@JulesN580]

Exactly the setup that l had. So beautiful

[@38911bytefree]

One of the best vintage B&Os designs. Jabos Jensen really was killing it !!!!! Beauty, class and somehow still modern with its minimalistic concept.

[@georgekane-be7lt]

Thanks for all the videos you have done and keep up the amazing work George

[@Mymatevince]

Thank you George

[@jochenwuerfel]

Now I can't wait for the next B&O 1hour+ video 😁

[@YellowJello57]

Love these types of videos, Vince. Thanks for the entertainment as always. Looking forward to some more of the old Roller soon.

[@guidomersmann9744]

I always love when you refer to the old one naming it "my one" even so both are yours! :D

[@robertbeer2584]

The old stuff design was so important just beautifull... thanks Vince

[@aeonikus1]

Wonderfully designed and engineered piece of audio history. Well done!

[@Retro_andy_1977]

Exellent job Vince!! Great work

[@theoriginalrecycler]

That weird plug is a 1980s adapter from an extension block. I had a couple in red, plugged the main unit into mains and mine had 4 of those plugs in sockets in the main unit. Mine powered the tv a Betamax and a vhs and a receiver.

[@ladronsiman1471]

This particular unit was the first B&O i got to know .Back in late 70's in Paris ,One of my school friends was rich and they had B&O stereo .. so we used to go to his place to listen top Pink Floyd in his stereo .. i then was intoduced to the magic of B&O .and 50 years later i collect B&O equipment..Every single system is designed with love and perfection

[@FourIntoOne]

From a time when B&O really were something. Space age at the time. I fondly remember having a couple of earlier B&O setups over the years.

[@vtallbloke]

I bet it sounds beautiful you can hear the tone changes and it sounds amazing

[@markwagner1997]

Great video! You managed to fix odd parts that would have made others give up. I bought my first B&O turntable in 81 and still use it's successor... a Beogram TX2. They made functional art.

[@funkykoldmodena]

Hello Vince, The knot in the tuning string is where the pointer is supposed to be connected. keeps the pointer in position Great video..

[@andyroberts9562]

Still watching and enjoying your videos Vince!, love how B&O put instructions on the case telling you how to dismantle it, seeing anything made by B&O reminds me of walking into a showroom years ago randomly pressing the touch sensitive buttons on the tuners & amps only for one to switch itself on at a thousand decibels, one of the staff had to come over and switch it off, i left the shop quite quickly after that

[@Mymatevince]

😂👍

[@terabeatnik2000]

Oo I have one of these! Since decades, actually. Did a complete cap job and new bulbsies last year.

[@HopelessUsername]

This was great 👍I have one with the same faults and would have been out of my depth without your video. Thanks.

[@spooktasticaparanormal]

What a thouroughly entertaining video Vince. It's given me the kick up the arse I need to finish some of my projects. Happy fixing. Paul. 😎

[@geoffh4578]

the transitors are dual for each channel which means there is no 4 channel output, the clue is written on the bottom, 30w output 2 channel and 15w output 4 channel, the speaker selection switch is another clue

[@helgew9008]

Correct. This is a class AB amplifier, so it uses two transistors for each channel, in a push-pull configuration. Given the age of the unit, I'd say they are bipolar transistors. One NPN and one PNP for each channel.

[@jasonbass2973]

What a beautiful stereo! Looks very futuristic for the 70's.

[@stevedebeukelaer1424]

Nicely done Vince

[@Asriazh]

the four powertransistors (the big ones at the back) aren't for four channels, they only do 2 channel stereo. The left channel uses a PNP and an NPN transistor and so does the right channel. NPN is for the positive swing of the sinewave (audio signal) PNP is for the negative swing. The balance potentiometers on that Bang & Olufsen potentiometer is a bit of an odd one. Normally at the center position, both channels would be at full volume and then, as you twist the button, one side would be dampened by increasing resistance. On this unit, the channel you move the balance slider to actually gets louder. Nice seeing this stereo being useable again. Thank You ^_^

[@Mymatevince]

Thank you Asriazh 👏

[@fathertiresias8561]

The other giveaway to the transistor configuration is the power rating printed on the bottom of the unit. It gives a speaker impedance of 4 ohms per speaker. The 2 speaker power output is double that of the 4 speaker output suggesting that when four speakers are used they will connect in series. Thus doubling the impedance and halving the power output.

[@adamgrimsley2900]

Whst a beautiful piece of machinery. Rewarding.

[@electronash]

Great restore on this one, Vince. It looked really nice at the end. I had to keep pausing the vid a few times, and watch it in chunks, but I'm not complaining. lol

[@zorkblat3858]

I can't get enough of this channel

[@grahamfoster9404]

Nice video Vince , who would not want that in their home . Fantastic cheers....

[@IAWAF]

Interesting video. You obviously know more about electronics that the average person. I wouldn’t even try to fix this. Good job.

[@budgetmerch]

Very stylish - Love B&O equipment. It seems that the tuning slugs are from a previous repair so that is interesting that they were just laying in the bottom like that. Great, also, that the faults were minimal. Definitely a keeper.

[@bathesheba111]

Hi Vince. I dont think anyone will make the carbon tracks, case of supply and demand. One solution is to bypass the faders. Use them as decoration only. Then attach micro potentiometers to the circuit board to bypass faders. Set them at a nominal value. Then have a flying lead to the back panel for a small potentiometer controlling volume. This is all easy to do and maintains the integrity of the B&O whilst still being able to enjoy its use. Sadly this problem applies to most vintage tech…..no more spares!!

[@Popeyes66]

Yowser. What an elegant piece of furniture.

[@599miata]

Super video Vince on a monument of radio. 👌👌👌👌

[@simonwatson5299]

Vince, you can buy carbon conductive paint/ink, you can also make it yourself, as it's just graphite, and glue. Nice fix. 👍👍👍👍

[@perkulant4629]

lovely piece of older tech.

[@samd3231]

Bonjour c'est génial de redonner vie à des anciens appareils hifi ou autre ... en plus quand c'est une marque mythique !! j'en ai croisé une il y a longtemps une trentaine d'années et je ne l'ai jamais oublié ...j'ai été marqué à vie je crois ..quelle belle objet travail magnifique !! bravo !!! Hello, it's great to bring old hi-fi or other devices back to life... especially when it's a legendary brand!! I came across one a long time ago, around thirty years ago and I never forgot it...I was marked for life I think..what a beautiful object, magnificent work!! well done !!!

[@maxz8807]

Stunning unit vince, great repair 👍

[@chrisw1462]

Man.. B&O was the absolute audiophile favorite of the late 70's and early 80's. Quality audio and beautiful design. A shame there's no one to fill their shoes these days.

[@wisher21uk]

Nice fix Vince, those clips for those bulbs maybe like heat shields as well? That is a mica insulator on the transistor, just hope that plastic you put on doesn’t melt ….. Seeing those looms reminds me of when I was at Watford college in greatham road in the 80’s, we had to do looming like that for wiring control panels, I did my city and guilds and got my E.I.T.B certification 😊

[@Mymatevince]

Thanks Gary, I bought some Mica and washers on eBay after reading the helpful comments👍 I know who to ask now if I need some wiring loom advice, good job it looks OK on the Rolls otherwise I'd have you on the first train down for help😂

[@wisher21uk]

@@Mymatevince good move Vince it’s safer that way, I’d come down anytime my daughter and family live in Bushey 😊

[@woollysoxx]

Very nice repair. Beautiful stereo

[@venenareligioest410]

In my opinion B&O designs are timeless 👏🏻👏🏻👏🏻

[@nevillegoddard4966]

Great work mate keeping a rare & interesting piece of 'old' equipment working! 😃👍!

[@Zoli1972s]

Wow, and again, what a masterpiece of engineering back in the day, B&O. And they didn't have CAD, just a piece of paper and top notch engineering skills. Good repair Vince, and a beautiful outro with that lovely song, which immediately made it into my chillout playlist. Good choice for that beautiful set.

[@mrdali67]

And the funny thing is, the exterior design was made first and then they told the engineers to some how fit the electronics inside 😆 It can be an absolutely horror to service because how cramped up things often is in B&O gear but there is a reason they have several models that is shown in Museums of modern art. I have seen the test centers they had at that time. They got a buttload of Phillips CRT's for their televisions and about 80% was returned again for not living up to their high quality standards. I once asked a friend that had a B&O store back in the 80's about 2 different models of their Televisions, one costing around 10k DKR and one costing 20K+ what was the difference .. they looked 100% the same and he told me "The one on the left is a 99% Phillips TV in a B&O case and B&O remote, the right one is fully B&O design with the same CRT, but only 10-20% of the best CRT's is used, The rest Phillips get back". And its the same thing today if you buy a B&O flatscreen for 100k+ DKR, just that it's now either a LG or Samsug screens, but only the best ones. You can litteraly go out and buy the same Samsung screen for 20-30k, you just don't know how good your screen is gonna be. It could be just as good, but it could also be one that should/would have been scrapped for a B&O model. So you basically you pay 4-5 time the price for B&O to bin the screens and do a Calman adjustment. It's only their own software and remote system that is different from a Regular Samsung screen.

[@tomharris1457]

Nice repair of a beautiful bit of kit!

[@NatureOkie]

I am a long time Beofan. Buying my 1st Beocenter while in the Navy. [Transister wash is practically nil!]

[@CLC-1000]

These are such pretty machines. 😍

[@andytipping70]

Hi Vince - there are two different types of pot track - linear does indeed drop proportionally depending on position of the probes - but LOGARITHMIC (LOG) pots have the resistance kinda squeezed up at one end of the track - volume pots are usually logarithmic, balance is usually linear - just a thought?

[@Mymatevince]

Thanks Andy, I now remember being told this in the past. I think in this instance they were supposed to be linear, but I do need to remember your wise words for future repair attempts 👍👍👍

[@5mf1nc]

No, balance pots are entirely different!! They are 0 ohm in the middle for both and keeps it on one channel, while the other have carbon trace/increasing resistance.Same for the other direction. Something like: 10k/\/\0----0 and the other side 0----0\/\/10k (or sometimes using more complex circuit to use basic linear pots but those tends to be not as good keeping the center)

[@russgladstone432]

That little black plug comes from a multi plug extension gang of sockets, usually 4 or 5 of them in a slim block which takes up less space than our conventional extension lead sockets , i had one years ago in the 80s/90s for my technics stack system… here in the uk

[@gbinford9009]

I was just about to suggest it Right before you started talking about possibly being able to 3d print the slider part. Great to live in a time where we can make our own obscure plastic bits to repair old devices

[@shevshep]

Great video Vince

[@mrdali67]

Comming from Denmark this is so fun to watch, I remember In school I was out in a 14 day intern to find out what we wanted to work with when we graduating and I was in a small radio schack, And he just got a Beomaster 9000 in for repair (Top Model) looked like a freakin Startrek Spaceship control. If people don't know it, look it up. Kinda same design as this just 3 times as big and It cost like a yearly salary to buy .. lol. He opened it up and he removed a big Chip, Propably some VLSI type, and then turned it 180 degree and plugged it in again, and turned the Radio on and it starting speweing fault codes out on the display. And then he could look it up in the service manual which circuit was faulty. Absolutely groundbreaking tech at that time. And just think of todays Multi room wireless systems. Bang & Olufsen had that, (just wired) over 40 years ago.

[@micbanand]

Love these videos! my first receiver where a beomaster 2000 my parents bought in the 80' Today I have a beocenter 9500 and a beogram 8002 LP in the living room. But I also have a hoppy room with my Technics set (Receiver, tape, cd. Later it got a sl-3200 LP) bought after my confirmation. and a Onkyo a 809 when it has to be Laught! And Last but Not Least. My fully restorated Pioneer sx-1010 The First real 3digits watt Monster Receiver from the 70' :):):)

[@ivanburrows6832]

Always hung my nose over B&O in the local hifi shop but no way of owning any and it but great to see so many years later ... Velvet Moon - Queen Of Hearts has just gone on my fav list so thanks all round...:)

[@edwardfitz-gibbon6484]

Hi Vince. Those sliders can have different rates of change too. Logarithmic and liner. So swapping the tracks may give you the wrong one. So look out for ‘log’ or ‘lin’ markings. And yes the tone controls will have track for right and left channels. However you would probably not notice a difference between the channels if they had a slight difference in response between them. The “plastic” spacers for the transistors are probably thin mica. Good electrical insulator and good heat transfer. Don’t use plastic. It may melt. And the little round plastic insulator tube goes in the hole in the transistor. Nice video and what a time travel that was. Brilliant. Thanks

[@Mymatevince]

Thanks for the tips 👍

[@kisslab]

You should have used a proper mica disk for insulating that transistor, not a piece of plastic because of better thermal transfer capabilities. A proper one for a TO-220 (that's the package of that transistor I think) costs only a few cents.

[@Mymatevince]

Thanks Kisslab, I have now bought a pack of 5 from eBay👍

[@helgew9008]

Also, that plastic isolation washer should have a shoulder on it, so that it goes slightly into the hole in the transistor. That way, it prevents the screw from touching the transistor. Oh, and hot glue on hot parts does not work.

[@Decybello]

Rememer gettng Beomaster 8000 as a gift from my uncle who was living abroad... You probably can imagine, what all of my buddies were talking about for months after they've seen it 😁 No wonder, cause it was not only eye-wateringly expensive back in the 80's (it's cost was comparable to a cost of buying a good car in my country) and in my homeland just impossible to get....

[@DTGuitarTech]

Great work as always

[@occamraiser]

One of my friends (one of the really rich ones) when I was at school in the 1970s had one of these in his living room. TOUCH SENSISTIVE! It was like Star Trek!

[@robinjones6999]

Ive had a lot of B&O stuff and it doesn't age well but when fixed and working it is ageless. The weird plug was a way of plugging all your hi fi into one block conveniently. Cant remember what they were called back in the day. There is a small fan base for the retro B&O gear, a guy near me has loads! Nice fix!

[@k8vnl]

Amazing how ong B&O have been going. My car has a B&O set up.I looked for the song you used at the end I loved that.

[@Tom-sg4iv]

I remember my grandparents having this. I was very fascinated by the touch control

[@MarcStift]

Nicely done Vince. 1:13:34 reminds me of the car KITT from knight rider with David Hasselhof

[@rogerrussell5155]

Hi vinca I've got a beogram 901 which needed a volume control replaced...lovely old piece of kit with a slide rule tuner

[@demonkey123]

The three pin plug was a British manufactured multi way connector manufactured by Micromark. I wish you could still buy them now. Great video. Thanks Vince.

[@skonkfactory]

The "bit of plastic" you're talking about is actually a piece of thermally conductive mica, and the sleeve that goes over the screw is supposed to stop motion from happening anyway. I would strongly recommend that you look up TO-220 insulating products rather than going with this solution because the plastic will melt if the transistor gets hot.

[@Mymatevince]

Thanks Skonk. I just bought 5 of them on eBay for under £3 delivered. It had the Mica and the washer. My washer on this B&O was broken and looked like a washer instead of a top hat washer. I'll get it swapped out when they arrive 👌👍

[@skonkfactory]

@@Mymatevince Phew, as long as you don't leave it that way, it'd be a shame if it shorted out and did some damage to such a lovely piece of equipment!

[@dodgydruid]

I'm reminded of another B&O we had in the 70's, a BeoVision massive and very futuristic looking TV which could be wired into ones BeoCentre or Master for producing stereo and quadro sound from the telly. Our one which cost a fortune was also only black and white but the clarity of the picture was so good, one didn't notice the lack of colour and was very clear, it spent its last days being serviced by my Sinclair computers and Atari 400 and our NES, sadly the gaming machines hastened its demise and one day I went to turn it on and it made this awful burning smell before a rifle shot bang and me father going bananas because the smell was acrid and smoke plumes coming out the back. My grandparents seeing I was bereft of a computer TV gave me their old old 1950's telly again black and white but heck it was better than nothing lol

[@Blackadder75]

if your family was rich enough to buy multiple home computers for the kid(s) why didn't they also buy a (cheap) 2nd hand small color tv to go with those computers?

[@sw6188]

The four outputs do not equate to the four transistors. This is only a two channel receiver - left and right, and each channel uses a pair of transistors. The two lots of outputs (A and B) are just mirrors of each other - they are both fed from the two channels. Broken faders are common on these old machines now. I have worked on way too many of them and they can take hours to get working reliably. They were revolutionary from a design perspective and great when they were new, but decades of time have taken a toll on the hardware and trying to keep these old girls alive is becoming increasingly difficult and expensive. By the way, you can get replacement plastic light diffuser cards for the bass, treble and balance controls. I did some repairs to a customer's Beo unit a few years ago and he provided a set to be fitted before I closed the unit back up again.