Doric Rediffusion MK 4 Vintage TV set.

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  • Опубліковано 29 жов 2024

КОМЕНТАРІ • 87

  • @stickytapenrust6869
    @stickytapenrust6869 2 місяці тому +2

    The Rediffusion Mk2 was made especially for the South African market when TV started there in 1975.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      I dont remember the Mk 2 but if it was only for export that will be why .

    • @celebrantmarc
      @celebrantmarc 28 днів тому

      I once repaired a MKII that had been imported by a customer who moved from RSA to the UK.
      It came in to our Rediffusion workshop in Dover.

  • @Lyndalewinder
    @Lyndalewinder 2 місяці тому +3

    Another great video Michael - its good to see that some of these old sets which we all remember from our youth are still going and being appreciated by their owners.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      Working on the second one now , many thanks for watching .lots more old sets to show soon .

  • @kjamison5951
    @kjamison5951 2 місяці тому +4

    Long time viewer of your channel. You are a member of a contracting group like thatchers or blacksmiths whose numbers are dwindling but whose knowledge and expertise will one day be lost. Thank you for putting the TV Repair shop on UA-cam even though it has disappeared from the high street.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому +3

      Glad you like the channel, never thought when I opened my shop in 1985 that 40 years later I would be the last man standing , this is a dying art as you say and hopefully making these youtube videos will leave a lasting memory.

  • @anthonychallis2472
    @anthonychallis2472 2 місяці тому +1

    Wow, that certainly bought back some memories. I actually had one of those sets on rental from Redifusion. I specifically chose that model because it was unusual in those days to have a composite video input. I was able to bypass the RF tuner on my video recorder, giving a slightly better picture. I do remember being surprised that when you switched the set off with the remote that the on/off switch actually popped out, requiring you to physically get off your bum to switch the set back on (hard times eh!).😂 Great video Michael.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      The Fidelity CTV14R had a similar type of one way on /off switch but the button never popped off in the fidelity .

  • @BeatboxNorwich
    @BeatboxNorwich 2 місяці тому +1

    My uncle (the electronics whizz) had an ITT Nokia TV that had that solenoid power switch. As a kid I was amazed by it!

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      Sadly I don't have any ITT/Nokia sets in my collection , Fidelity CTV14R also had a solenoid on/off switch .

  • @jkmac625
    @jkmac625 Місяць тому +1

    We had a Rediffusion TV when I was about 10 or 11 that had a similar power switch. The remote looked different to that Granada one, and it had two ways to switch off the TV via the remote. A normal stand-by button and a second one marked as "OFF". If you held the OFF button down for a few seconds it would cause the power button on the TV to click to the off position, so it must have been fitted with one of those solenoid switches.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      The remote worked a lot of different sets at the time because they all had the same remote control chip set , some sets that spring to mind were Hitachi and Salora.

  • @stickytapenrust6869
    @stickytapenrust6869 2 місяці тому +1

    4:15 - the Videocolor tubes are great! They last a long time with a bright picture.
    Mine has been working continuously since 1981/82 still with a tube as bright as when it was new and it’s one of the first Mk4s, yours is a Mk4A from 1983/84/85 time as it has Rediffusion’s CITAC tuning system.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      The tuning system/ remote control was pretty common back then , I guess it would have been lifted straight from the chip manufactures datasheet as quite a few other sets like Hitachi and Salora, finlux used it , in fact the first Vestel set I ever saw had the same chip set .

  • @Oldgamingfart
    @Oldgamingfart 2 місяці тому +1

    I was pleasantly surprised that remote worked, as I always associated them with the Salora-based sets (Finlandia; Hitachi, etc). Great stuff as always!

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому +1

      That remote worked a lot of different set at the time because they all used the same remote control IC chip set, I have one somewhere that I modified with a button on the side for Eeprom programming .

    • @Oldgamingfart
      @Oldgamingfart Місяць тому

      @@michaeldranfield7140 Yes I recall some consumer remotes had a hidden button inside for enabling or programming of the option bytes, etc. Fun times!

  • @robtitheridge9708
    @robtitheridge9708 2 місяці тому +3

    Alass poor Doric i knew them well ,made very good rental sets.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      Don't think rental exists anymore does it , I cant imagine anyone wanting to rent now stuff is so cheap brand new .I know it was a massive business in years gone by , I remember going to big warehouses rammed with EX rental TV sets for sale .

  • @celebrantmarc
    @celebrantmarc 28 днів тому

    Loved this. A trip down memory lane for me.

  • @proluxelectronics7419
    @proluxelectronics7419 2 місяці тому +7

    Made them in Billingham, big employer in the north-east, factory was taken over by Samsung VCR.

  • @stickytapenrust6869
    @stickytapenrust6869 2 місяці тому +1

    23:45 - the advice to re-cap comes from pre-1970s TVs when they used duomold, Hunts and wax-paper capacitors, which really haven’t lasted the test of time.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      as you can see im not a fan of re capping ! yes with wax paper caps its essential but when good quality caps are fitted in modern equipment it plays no part at all, saying that however I did come across a 20 odd year old audio amplifier , cant just remember but I think it was marantz with low audio output and every single capacitor on the amp board in both channels had dried out, possibly though due to the heat generated .

  • @kenw394
    @kenw394 2 місяці тому +6

    As an ex Rediffusion tech, I was smiling when you were cleaning the "infa red window" at the top of the set. Christmas time used to cause a lot of call outs for faulty remote controls, easy fix though, just move the Christmas card placed in front of the IR window at bottom of TV.
    Another common problem with these was the insulation breaking down on the tripler, causing it to arc quite spectacularly to the earth wire of the focus control, usually with lots of smoke and noise.
    Looking forward to the video on the second MK4.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      Been making the second Mk 4 video today, might be a short while before its on though, got the set working and the Tripler is faulty !!!!!

    • @kenw394
      @kenw394 2 місяці тому

      Is it arcing? Unfortunately I can't help you with a replacement haven't got any TV spares at all now. Might have some service manuals in the garage if you're interested?

  • @mfd70
    @mfd70 2 місяці тому +1

    I like these TV''s as I used to fix a number of them in the early/mid nineties, they were mostly Granada ex-rentals from a company called Display Electronics. As they were used for an early "digital signage" system teletext or remote sets weren't used but the AV input was essential. There were 90 and 110 degree versions, 90deg had RCA tubes and had a good picture, 110 were videocolor and pictures were not as good. I never saw a bad chopper transformer or LOPT but triplers would fail regularly, the green units were replacements, the original seemed to be black units marked ITT. The mod on the line scan panel was to drill out a 1/4" hole and fit a jumper wire. The other unusual feature of some of these sets was an earthed chassis but only some had the earth connection, some of the HF cable system sets had two core mains cables although the chassis was still isolated. Look forward to the next MK4 repair.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      I wondered if the green Tripler might have been a replacement as the service manual gives a different part number and I remember these green units been extensively used in Grundig sets , I remember Display electronics advertising in some electronics magazines , if its the same company Im thinking of they use to sell a lot of EX computer related stuff ,
      the next Mk 4 video is underway, I have already got the set working but the Tripler is faulty !!!

  • @PRDowding
    @PRDowding 2 місяці тому +2

    Great job mike ! I sold loads on the MK4's badged Murphy in the 1980''s. Then Granada bought out Redifusion & closed the factory & that was the end of it all !

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      Production must have ended with the MK 4 chassis then as the Mk 5 colour portable was made by Sharp and just re badged .

    • @kenw394
      @kenw394 Місяць тому

      ​@@michaeldranfield7140 The portable TV was designated SP1 for the non remote and the later remote version was the SP2.

  • @GaryB007
    @GaryB007 2 місяці тому +1

    The Murphy version has been mentioned in the comments. They were sold by a company called JJ Silber, based in Wembley - where I got my first job as a trainee engineer after leaving school. They sold 20", 22" & 26" sizes in standard, remote & text versions. Silbers were park of GUS, and sold them via their mail order catalogues, as well as normal dealers. I repaired lots of them, and as they were sold via mail order, there were lots of returns, so we had to repair and re-box those too. GUS bought the Murphy name and put it on all sorts of products, including Sanyo Beta VCRs. I bought several sets for friends and family, and they lasted many years. My mother & father had one and both were heavy smokers. Like this set, I had to clean around the anode cap once every year or so to prevent arcing.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      Its a long time ago now but I also seem to recall the Murphy brand been used in some Fidellity made sets , regular cleaning of the anode cavity in the house of a smoker was a must due to the high voltage attracting nicotine in , I always use to find heavy deposits of nicotine would also de tune coils such as in the IF stages.

  • @darrenmurphy6251
    @darrenmurphy6251 2 місяці тому +2

    best crt tv ive ever owned, i had the 26inch great picture and it was bomb proof reliable except chopper transformer joints ,my chassis was identical but i am sure mine had a scart socket though
    later on i had jamma arcade machines with hantarex monitors that had videocolor tubes and they really lasted well but they seem to have a bad rep around youtube

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      possibly not the tube at fault but the way its driven , as an example the CRT in the TX10 didn't last five minutes but the same tube in the Amstrad CTV2200 would be sparkling even after a few years use, in fact the 2200 was a good donor set and quite possible why you no longer see any !

  • @uquarosh
    @uquarosh 2 місяці тому +2

    Thanks. Love these vintage repair videos.❤

  • @Synthematix
    @Synthematix 2 місяці тому +3

    As unreliable as they were most of us grew up with rediffusion sets, i have very fond memories of them watching rainbow when i was about 7 years old, even remember watching the queens jubilee and elvis dying in 1977 i was 4 years old lol.
    More michael! we love the tv videos, longer the better.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      Un reliable but repairable , flat screen TVs are un reliable but usually end up as scrap due to panel failure and a CRT set would usually last a lot longer than the 18 months some people get out of there new flat screen set, the longer video seems to be common with these older vintage sets !

    • @Synthematix
      @Synthematix 2 місяці тому

      @@michaeldranfield7140 In china they made a 32 inch crt thats only 5 inches wide! damn if crt sets were still being made today as mainstream they would beat everything for long life and picture quality, of course its all down to cost.
      I hate OLED they need to stop making them, very short lifespan of the pixels, phones usually get destroyed after as little as 12 months, they fade so bad its unbelievable,
      I think the future of screens is micro sized led pixels, could you imagine the contrast ratio, it would be perfect!

  • @johnosborne9271
    @johnosborne9271 2 місяці тому +3

    We had one of those sets, I always remember that the power button would fly across the living room if you used the remote to switch it off 😂

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      unusually this set and the other one still have the original button .

  • @deanagoes2791
    @deanagoes2791 2 місяці тому +1

    how sweet this tv is.everyone loves it.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому +1

      the AV input is a very unusual touch in a set this old, I'm sure the customer will love it too.

  • @f.k.burnham8491
    @f.k.burnham8491 2 місяці тому +2

    Many folks tell me to recycle all my own manuals, but on repairs like this manuals are needed. If you have to find a replacement they are hard to find and cost a lot.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому +1

      Back when we went digital it killed CRT sales and repairs overnight and I was throwing working sets away as no one wanted them even for nothing, but been a bit of a hoarder I decided to keep all my service manuals , not because I thought I would ever use them again, I kept them for the memories they hold of happier times gone by and I have to say it was one of the best decisions I ever made , I never thought all these years later I would be repairing CRT again and yet here I am, so yes , don't throw away any of the manuals you have .

  • @radio-ged4626
    @radio-ged4626 2 місяці тому +1

    One of the Thorn sets used an ultra-sonic 3 button remote which just had volume up and down as two of the buttons and the third was for channel change, one press would hop to the next channel, 1 to 8 and back to 1, and if you held in the channel change button in it would pop the on/off switch out with a relay just like this set does. I can't remember which chassis it was on. I think it was either an 8000, 8800, 9000 or 9600. Definitely before the TX9 and TX10 chassis.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      I cant remember now , I have an 8800 with 2 button ultrasonic remote control and Im pretty sure the 9000 used the same remote, 8000 I dont think was a remote set so I would guess its the 9600 but cant remember for sure.

  • @kenw394
    @kenw394 2 місяці тому +1

    The reason the panels were easy to remove was the system Rediffusion used for repairs. Field techs would swap out boards if difficult repair. Which would be repaired in the workshop, and reissued to the field techs to use. This kept the time in the customers house to a minimum.
    The workshops would have modified test TV's to do the repairs on.
    The Mk2 Tv was only sold in South Africa, basically a mk1 with transistor line output as you couldn't import tvs with a valve line output stage.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      interesting , I didn't even know there was a MK2 , I think radio rentals with the Thorn 3500 had the same philosophy with panel repairs.

  • @crr8297
    @crr8297 2 місяці тому +2

    I agree with your capacitor philosophy, I've worked on electronics for 50 years and only replace them when they get bad, but the newer high frequency switching power supplies put more of a strain on components and they do fail more often, I think that's what gives capacitors a bad name.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому +1

      These are some cases where its essential to replace lots caps but only in modern stuff where all the caps are Chinese and don't last five minutes, in old stuff components were much better made and its pretty pointless replacing good parts with poorer quality ones .

  • @djdrunkenmonkey2
    @djdrunkenmonkey2 2 місяці тому +2

    a proper well built tv ! looks good aswell

  • @michaelwaite6725
    @michaelwaite6725 2 місяці тому +3

    I use to buy Redifusion mark 4 tvs from a ex rental warehouse in Preston lancs ( Sonic tv) , the only downside to them the on off knob often flew across the room as the relay operated the on off switch with some force 😂. Generally they gave good picture even though they were videocolor tubes . Made in the north east they were also sold to independent tv dealers under the Murphy brand as well as rented by Granada tv rental in the later stages

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      I never bought these Ex rental , I was a big fan of the GEC 2110 but cant remember just why .

    • @michaelwaite6725
      @michaelwaite6725 2 місяці тому

      @@michaeldranfield7140Gec 2110 perhaps it was the double sided print ? But they did give a good picture

  • @geoff3172
    @geoff3172 2 місяці тому +1

    Great video, learnt a lot, you have a great way of explaining

  • @tubeDude48
    @tubeDude48 2 місяці тому +1

    I'd re-seat all those IC's since those cheap push-slide sockets were used, rather then the good Pin-type IC sockets.

  • @steve83803
    @steve83803 2 місяці тому +1

    105 degree electrolytic capacitors instead of the cheaper 85 degree, a sign of quality. Power efficient switch, no standby mode. Foam cleaner then Mr Sheen on the casing. Pretty sure there was also a Mk 5 portable model too.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      Correct, the MK 5 was just a 14 inch set made by Sharp and badged up Rediffusion

  • @leetucker9938
    @leetucker9938 2 місяці тому +1

    that was awesome

  • @adamdavies163
    @adamdavies163 2 місяці тому +1

    We had a 14" Fidelity portable Tv that featured a similar ejecting power button.

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому +1

      Got one of those , a CTV14R I think the model number is .

    • @adamdavies163
      @adamdavies163 2 місяці тому

      @@michaeldranfield7140 Just gone back and reviewed the video you did. I knew something didn't look quite right with the CTV14R. Turns out ours was a CTV14S which had the 7 segment display.

  • @grahamroberts1833
    @grahamroberts1833 2 місяці тому +1

    Hi Michael, first time commenting here, relatively long-time viewer. I love your videos. I have fond memories of a friend's dad working for Tucker Brothers (not sure if they were a national chain but they were in Essex) so he always had different old CRT sets as his main set in the lounge. One I particularly remember is a Grundig which had Super Sound on a badge on the speakers (or was that a PYE?). I later bought a rear projection Grundig that would rise out of the cabinet and then collapse when power off. Wonder if you have ever come across them?

    • @michaeldranfield7140
      @michaeldranfield7140  2 місяці тому

      More likely the Grundig sets with super sound than Pye and I seem to think some Grundig sets also used the term Super colour but its a long time ago now, never did a lot with projection sets apart from the odd couple of Samsungs

  • @jurekwalek1819
    @jurekwalek1819 2 місяці тому +1

    Hello, I'm sorry that this is off topic, but could my friend help me with a diagram for the Denon RCD-M41DAB receiver? About a year ago there was a video about its repair. I can't get this diagram anywhere. I will be very grateful.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      If this is the one you e mailed me about a couple of days ago then yes I have the service manual , I did receive the e mail but cant reply, my computer wont let me send to G mail addresses, they just bounce back , if you can send me an alternative e mail adresse I can help you.

    • @jurekwalek1819
      @jurekwalek1819 Місяць тому

      Hello, I have already managed to get the diagram, but thank you for the information. Does your friend have access to the processor software in this equipment? Because mine is probably damaged.

    • @michaeldranfield7140
      @michaeldranfield7140  28 днів тому

      No sorry I have no access to software, in fact I still have a Denon player somewhere with no Dab radio and I'm sure it's a corrupt Eeprom but the only way I can re program it is to wait untill I get another working unit to read the program from.

  • @domenic5136
    @domenic5136 Місяць тому +1

    What is that black band that runs horizontal across the screen.

    • @michaeldranfield7140
      @michaeldranfield7140  Місяць тому

      It comes from the camera, its not on the TV itself, something to do with the shutter speed of the camera

  • @michaelturner4457
    @michaelturner4457 2 місяці тому +2

    Did Granada take over Rediffusion? Because originally they were rival TV rental companies, along with DER and Radio Rentals.
    I remember the old Rediffusion sets that didn't have a tuner in them, because they were used on the Rediffusion cable system.

    • @johnosborne9271
      @johnosborne9271 2 місяці тому +1

      I remember our rental switched over to Granada when Redifusion closed down

    • @user-rf9me7xm1w
      @user-rf9me7xm1w 2 місяці тому +1

      Yes, the rediffusion TV's on!y contained a system frequency board which was just a video demodulator. The channels were selected using a wall switch which connected the set to one of the four network input twin pair cables. The tuning was carried out at the main receiving aerial site and the amplitude modulated TV signals were carried on four co-axial cables situated underground. These were connected to kiosks (metal cabinets) situated on street corners. These contained HF amplifiers which boosted the amplitude modulated signal before being presented to the feeder cables which were usually situated on the rear of houses. It was a very successful system as off air TV reception was very poor in the early days. Unfortunately, it proved uneconomical to upgrade the system to accommodate more channels and the system was abandoned.

    • @steve83803
      @steve83803 2 місяці тому +3

      I was made redundant in 1982 from Rediffusion a year after I finished my 5 year apprenticeship. Not long after they were taken over by Granada. As apprentices we were always sent up to the training school for 2 weeks in summer at Poulton le Fylde just outside Blackpool, used to stay in a Blackpool guest house and basically got a free holiday 😀

    • @kenw394
      @kenw394 2 місяці тому +2

      We may have met at one of those training weeks
      I managed to last until 2013 by then the company was Boxclever, still going as far as I know.
      Happy memories.

    • @user-rf9me7xm1w
      @user-rf9me7xm1w 2 місяці тому +2

      @@kenw394 Steve and Ken, I also went the Poulton, Rediff was a good company to work for, their training was first class. I went on a few courses but they were mainly during the winter months. Blackpool out of season was a bit bleak as I remember. As you say, happy memories.

  • @robtitheridge9708
    @robtitheridge9708 2 місяці тому

    Correct the only use for these sets now is games display