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An early 1980's video monitor

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PYE625
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Whilst not a television as such, I couldn't help falling for this 9 inch monochrome monitor on ebay for £10. So here it is, a British made monitor by a company called Melford Electronics in High Wycombe. The model is DU3-9 and runs from 24vdc at about 750mA. It has two composite video inputs and both are switchable for 75 ohms impedance. The front panel has a switch for 525/625 lines. The picture is good and sharp and is a nice item I think. The little CRT is an Ediswan (Thorn/Mazda) CME 2325W.

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To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 27/04/2018 6:35 pm
PYE625
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I wonder for what it's intended purpose was, security camera perhaps?

Or something to do with the MOD as there is a place on the rear marked "MOD RECORD".

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Interior date...

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To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 27/04/2018 7:00 pm
Nuvistor
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MOD record will just be modifications, nothing to to with the MOD. 

Is there any screen burn? Security monitors constantly displaying the same picture get the image burned in. It could of course have had little use.

Certainly looks good.

 

Frank

 
Posted : 27/04/2018 7:16 pm
PYE625
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Lol, thanks Frank....MOD not M.O.D ? 

No screen burn, looks perfect and so bright and sharp. Reckon it's not been used much.

PS, Not sure whether this thread should be in the Broadcast Equipment section? 

To understand the black art of electronics is to understand witchcraft. Andrew.

 
Posted : 27/04/2018 7:18 pm
Nuvistor
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I used to go to a large LAB were they had a synchrotron accelerator, they had monitors around the showing beam condition and lifetime etc. These had the info burned into the phosphor, running 24/7.

Very interesting place, now closed as far as I Know. 

Frank

 
Posted : 27/04/2018 7:26 pm
Marc
 Marc
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Hi Andrew,

I recognise that monitor, a place I used to work at back in the mid 80's had one stashed under the till as part of a CCTV system. I remember it well as back then I couldn't understand the point of the 525 line switch.  ? 

Marc
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RSGB call sign 2E0VTN

 
Posted : 27/04/2018 9:27 pm
hamid_1
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You might be interested to know that Melford Electronics, the manufacturer of this monitor, is still in business. They make displays for professional uses, such as ships and railways. Of course, no CRT displays now it's LCD these days.

See melfordtechnologies

The MOD label on the back of the monitor is used for recording modifications, it doesn't mean Ministry of Defence, although such labels are often found on military or aircraft equipment. Sometimes a product needs to be modified for safety or reliability reasons. To avoid failure and possible accident, it's important to identify units which have or haven't been modified, hence the label. Your label indicates that Modification number 1 has been carried out (number 1 has been struck off on the label). The manufacturer would have issued a service bulletin explaining Modification no. 1 and what it involved.

 
Posted : 27/04/2018 9:31 pm
PYE625, PYE625 and PYE625 reacted
Cathovisor
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Oh goodness me, Melfords! Now, that brings back some memories. Intrigued this is 24V operation though. One place that they used to get used in was signalboxes, for level crossing monitoring: they only powered up when the procedure to lower the barriers started.

Needless to say, once upon a time the BBC was awash with Melford monitors; mostly the DU1 monochrome ones from 12" to 24"but also DU2 and later, DU5 and DU6 colour ones. The sync separator circuit in a DU1 defies explanation...

 
Posted : 27/04/2018 10:12 pm
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