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B&W TV Mystery Studio Monitor

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WayneD
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This came from a transmitter site and I have no idea of its age or manufacturer.

IMG 20221001 190308
IMG 20221001 190314
20221001 190028
20221001 190133

 The tube seems to have some sort of safety glass attached although I'm unsure if this is to protect the screen from accidental damage (it's supposed to be portable but weighs an absolute tonne) or if it has no implosion protection. Has a modern MK mains plug fitted and a PAT test label from 2004.

I have reason to believe this started life at Tyne Tees Television but was later used for monitoring the feed at the transmitter site  

 
Posted : 01/10/2022 8:14 pm
mfd70
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Looks a bit like a Melford, but can't see any names on it. Looks like musa for the input and output so designed for broadcast use I'd guess especially as it has a 4.43Mhz switchable filter. Perhaps a standard monitor spec'd by the IBA, perhaps 16A means something ? Nice find, does it work ?

 
Posted : 01/10/2022 9:37 pm
Cathovisor
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That's got either Post Office or the Services all over it - designations like "Fuse No. 48" and "Picture Monitor No. 16A" reek of it, and I know of no commercially-made monitor that ever used MUSA connections - F&E yes, BNC yes, but a MUSA? Don't forget that the MUSA was also a GPO connector. (MUSA is an acronym for Multiple Unit Steerable Array)

What's particularly interesting is that it has retained the large Bulgin mains connector at the back. Most broadcasters would have modded that out.

 
Posted : 01/10/2022 10:38 pm
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WayneD
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@mfd70 haven't tried it yet. Currently doing 12 hour shifts at work so won't get a chance until Monday at the earliest. There's no manufacturer name anywhere on the outside.

@cathovisor aha! Yes, I've covered the stickers on the back just in case there was any information that shouldn't be shown. It seems to have been used for the link between studio and transmitter site.

 
Posted : 02/10/2022 5:19 am
Alex728
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Comparing it with PO/BT equipment of the 1970s/early 80s I wonder if CER 82/2 means it was made as "recently" as 1982? Alas, I can't find CER as a manufacturer code on any of the lists collated by those who collect old telecoms equipment, but it seems to be in the right format for something PO/BT would have built to a certain specification, but perhaps made by more than one manufacturer (the 700 series telephones being a similar example)

 
Posted : 05/10/2022 12:43 am
WayneD
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We have a manufacturer:

20221005 145618

Cotron. The date on the PCB says 1976 and there's a quality control sticker inside from January 1977.

 
Posted : 05/10/2022 2:52 pm
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turretslug
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Posted by: @wayned

We have a manufacturer:

20221005 145618

Cotron.

Thanks!- I couldn't for the life of me remember the name, but the house style was very familiar, i.e. the black panels with dome-head Posidriv screws, the small black collet knobs on slim-shaft pots, the pressed louvres, even the type of neon indicator. The cottage-industry metalwork typical of the small-scale outfits that made small-run, even bespoke stuff for professional users back in the day. We had a lot of Cotron monochrome monitors at work, some 10" narrow-angle deflection in a long case, many of them having a very square-edged and flat-faced 7" tube and sized so that two fitted side-by-side in a 19" rack. They were of pretty conventional, application-note type design and reliable, I don't recall any stock faults, just the scatter of things associated with stuff crammed together, like weary electrolytics. The tube in the 7" types had a typical bluish consumer tint to the phosphor, the front panel had a slide runner either side of the tube to accomodate an amber-tint rectangle of acrylic to at least get it a little closer to Illuminant D-ish.

 
Posted : 05/10/2022 3:56 pm
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Cathovisor
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@wayned I thought it might be Cotron. They used to supply monitors to the railway in BR days - primarily for CCTV surveillance of remote level crossings.

 
Posted : 05/10/2022 5:22 pm
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WayneD
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@turretslug this one does have something on the screen but I don't think it's a tint. Looks more like something to protect the screen from damage.

 
Posted : 05/10/2022 7:26 pm
crustytv
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Posted by: @wayned

Looks more like something to protect the screen from damage.

I wonder if it's some version of a Fenbridge guard, or by the time these monitors were in use, was that something long dispensed with?

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Posted : 05/10/2022 8:28 pm
MurphyV310
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Looks the same as a Cotron monitor in my loft, the one I have is in really bad condition, never tested it, perhaps one day. 

Yes its a fenbridge cap, the CRT will be an unprotected screen, the snag with them is they are not 100% transparent so slightly degrade the picture, not good for a studio monitor. 

Cheers,
Trevor.
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Posted : 05/10/2022 8:37 pm
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Cathovisor
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I'd have thought it unlikely to be a Fenbridge cap at that age? Mind you, that speckling around the face of the tube... 

 
Posted : 06/10/2022 10:29 am
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crustytv
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Posted by: @cathovisor

Mind you, that speckling around the face of the tube... 

That's why I suggested it, I had a B&W dual standard a few years ago that had a Fenbridge, and that speckling was exactly what I had on mine.

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Posted : 06/10/2022 10:54 am
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WayneD
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This is a very unusual tube, I'd expect mono tubes of this era to have much thinner necks and a smaller yoke, but then again this isn't a consumer set.

20221005 145726

I suppose the fenbridge cap might've still been a thing on specialist equipment.

 
Posted : 06/10/2022 12:37 pm
ctc15
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I did not think l would see one of these again .It is a PO Picture Monitor 16Afrom the late 70s.

The tube is a twin panel tube where the implosion is bonded onto the tube screen.

The one in this monitor is de- bonding (cataract ).

It was unusual in that it was made to show up poor signals on the screen hum,poor sync etc.

Keith 

 
Posted : 07/10/2022 9:23 am
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Cathovisor
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The usual thing with professional picture monitors is that unlike domestic sets, they're not designed to hide signal imperfections but to show them in great detail, usually to some detriment of the displayed picture.

I'm pleased my hunch was right in thinking it was ex-Post Office 🙂 

 
Posted : 07/10/2022 10:10 am
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WayneD
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This was hiding under multiple "DO NOT USE AFTER xx DATE" stickers on the plug:

20221005 145022

 

 
Posted : 07/10/2022 8:12 pm
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MurphyV310
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@wayned

So the set is essentially scrap as the plug is past its used by date. Oh well you loose some etc 😂😂😭😭

Cheers,
Trevor.
MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member

 
Posted : 09/10/2022 8:10 am
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WayneD
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@murphyv310 yeah, such a shame... 😁

The oldest sticker was 2001 and the most recent was 2004. Was this just a way of ensuring that it gets tested I wonder? 

It is completely dead though, putting a really low watt bulb in series didn't show much. I think the only draw was the neon light on the front. No obvious fuses blown either.

 
Posted : 09/10/2022 7:14 pm
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Cathovisor
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Posted by: @wayned

The oldest sticker was 2001 and the most recent was 2004. Was this just a way of ensuring that it gets tested I wonder? 

Just the usual statutory testing of equipment as required by the Electricity at Work Regulations 1989. It probably got stuck on a shelf when it died and never fixed.

 
Posted : 09/10/2022 8:32 pm
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