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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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27th Jun 2021, 7:14 pm | #1 |
Heptode
Join Date: Jun 2005
Location: Sunderland, Tyne and Wear, UK.
Posts: 661
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Mitsubishi Blue Diamond Tv
Hi my wifes mother bought one of these tv when they first came out in 1979 1980 ? & it got retired in 2010 due to the CRT going flat in over 30 years it never had the back off for repair were these all these sets reliable ? must have been a great set for the rental trade ? has anyone had any experiences working or selling or renting these sets out kind regards Bob
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27th Jun 2021, 7:41 pm | #2 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,843
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Re: Mitsubishi Blue Diamond Tv
Most Japanese sets of this era were astonishingly reliable.
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27th Jun 2021, 10:38 pm | #3 |
Hexode
Join Date: Aug 2018
Location: Dublin, Republic of Ireland.
Posts: 493
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Re: Mitsubishi Blue Diamond Tv
The Mitsubishi sub brand was Black Diamond. Most of them used Vestel Chassis and normally were surprizingly reliable. In Ireland at least they were everywhere in the 90's/early 2000s, i know at least 10 people that had them and very rarely they had issues.
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28th Jun 2021, 10:09 am | #4 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
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Re: Mitsubishi Blue Diamond Tv
I think you might have your diamonds confused Luke!
Blue Diamond was a trade name Mitsubishi used in the early Eighties as the CRT had a definite blue tint to it which actually did colour the picture slightly. These used a horizontal circuit board with vertical boards up the side depending on the features required. As you say, they were very reliable. The most common fault was a dry jointed line driver transformer. Large screen versions had two electrolytic capacitors in the frame stage that failed - maybe 330uF? There was also a 2.2 ohm resistor in the sound circuit and one in the standby circuit for remote models. Either could fail for no reason. On remote 26" models intermittent sound was cured by removing and hard wiring plug and socket UC. As the nice man from Mitsubishi told me back in the day "remember Uncle Charlie and you won't go wrong!" I have two of the 26" ones, both working well, one of which was still in daily use by a customer until she beat it to retirement in 2018. Later Mitsubishis were made in the UK and were nothing special. Black Diamond was a brand name used much later to house the Vestel AK series chassis, usually the AK45 or AK49. These had their fair share of faults, often the EEPROM on the AK45 and the LOPT on the AK49. I wasn't aware of any connection to Mitsubishi. |
28th Jun 2021, 10:17 am | #5 |
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
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Re: Mitsubishi Blue Diamond Tv
From the Mitsubishi Electric website. The history of the three diamonds trade mark: https://www.mitsubishielectric.com/e...logo_more.page
DFWB. |
28th Jun 2021, 11:09 am | #6 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Mitsubishi Blue Diamond Tv
Quote:
Lawrence. |
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28th Jun 2021, 4:01 pm | #7 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: Mitsubishi Blue Diamond Tv
It was better for the rental trade to have a customers TV break down on the odd occasion. If it never failed like the Mitsubishi, they thought they were not getting value for money and wish they had purchased rather than rented.
This could be partly overcome by the 'courtesy call' maybe once a year to check and possibly adjust the TV for the best performance. John. |
28th Jun 2021, 4:06 pm | #8 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: Mitsubishi Blue Diamond Tv
If there wasn't a Mitsubishi like logo to go with the name, there probably wasn't a connection. Some other brands that wanted to maintain a presence in the market did use Vestel to do that, but rather under their own name or it wouldn't have made much sense.
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28th Jun 2021, 4:17 pm | #9 | |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,996
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Re: Mitsubishi Blue Diamond Tv
Quote:
My friend in the TV trade would lend what he perceived as his more-cash-rich customers a new, bigger, top-of-the-range model while he took their old one away for repair. When phoning to arrange the return of the repaired one he'd ask the customer how they liked the loan-one, pointing out that (if it was rented) just how little extra-per-month the newer one was, or (if it was bought) saying that the trade-in on the old one would cover all the credit-deposit and half the cost of the new one. Many sales were made that way! |
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28th Jun 2021, 4:21 pm | #10 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: Mitsubishi Blue Diamond Tv
For computer monitors at higher resolutions, I found both the trinitron as well as the diamondtron picture quality unsatisfactory compared to the usual inline tubes using delta masks. They never succeeded in lowering the aperture grille pitch to numbers that would support their misleading advertisements (for example they advertised it as 0.22 or variable from 0.22 to 0.25 depending on the tube model, so it looked lower than the 0.28 or less of the competition which in fact corresponded to a 0.21 vertical pitch). Also the convergence and geometry were slightly less optimal on the less expensive models.
Last edited by Maarten; 28th Jun 2021 at 4:26 pm. |
28th Jun 2021, 4:27 pm | #11 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Mitsubishi Blue Diamond Tv
Anyone made bogus claims from the manufactures U/G schemes, some manufactures used to cough up no matter what was submitted.....(At the bosses request..!)
Lawrence. |
28th Jun 2021, 5:32 pm | #12 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,843
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Re: Mitsubishi Blue Diamond Tv
An older couple I know were using a 1980 Mitsubishi as their main set until DSO. Never went wrong in its life, sent to WEEE in full working order, they said.
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28th Jun 2021, 10:32 pm | #13 |
Nonode
Join Date: Sep 2017
Location: Stockport, Cheshire, UK.
Posts: 2,002
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Re: Mitsubishi Blue Diamond Tv
I was given an early 1990s Mitsubishi set by one of my Dad's friends when I moved into my flat in 2009.
He had lost the remote but still had the instructions & brochure. I could get the basic controls with a universal remote. The picture was a bit red on the aerial but looked OK when connected to a digibox through the RGB Scart. It was briefly my main set until my Dad brought round my Philips set, when it was moved into my bedroom. Eventually I gave it away after the digital switch-over, & stupidly gave the new owner the brochure!
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29th Jun 2021, 4:29 am | #14 | |
Hexode
Join Date: Aug 2018
Location: Dublin, Republic of Ireland.
Posts: 493
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Re: Mitsubishi Blue Diamond Tv
Quote:
I know a few people that had Black Diamond sets with the AK19 in them and they usually were trouble free, ive a Ferguson Badged AK36 set that i bought new in 2006 and its still working perfect and has never given an ounce of trouble. I guess they were very hit and miss reliability wise
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29th Jun 2021, 10:28 am | #15 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: Mitsubishi Blue Diamond Tv
If they were marketed as Mitsubishi and no court cases followed, they would have likely been marketed by Mitsubishi and carry their logo as well, so that was apparently the case then.
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29th Jun 2021, 10:35 am | #16 | |
Octode
Join Date: Jul 2004
Location: Evesham, Worcestershire, UK.
Posts: 1,422
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Re: Mitsubishi Blue Diamond Tv
Quote:
Greg.
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Picture, sound?, DOOR. |
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29th Jun 2021, 10:40 am | #17 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,741
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Re: Mitsubishi Blue Diamond Tv
Without wanting to go off topic - so many makes ended up being fitted with Vestel chassis, so it is no surprise that Mitsubishi would have ended up doing this.
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29th Jun 2021, 11:23 am | #18 |
Heptode
Join Date: May 2006
Location: Accrington, Lancashire, UK.
Posts: 978
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Re: Mitsubishi Blue Diamond Tv
We used cringe at Vestel chassis but were they really that bad. At least they were predictable. the IC2 bus system did have its issues but Sharp were just as bad. (The FW and GF range), So many went over to Vestel, looking back I liked them.
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29th Jun 2021, 11:25 am | #19 | |
Hexode
Join Date: Aug 2018
Location: Dublin, Republic of Ireland.
Posts: 493
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Re: Mitsubishi Blue Diamond Tv
Quote:
Found these two sets with the same wording this morning on google, an AK19 and Ak36 set
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Cheers, Luke |
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29th Jun 2021, 12:17 pm | #20 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
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Re: Mitsubishi Blue Diamond Tv
You live and learn! Odd that they chose 'Black Diamond' rather than blue...
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