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CTV Sony CVM-1330UB

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WayneD
(@wayned)
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Just catching up with everything, been so busy with the house, the G8 and work along with other stuff. Here's a Sony CVM-1330UB I picked up last month:

Screenshot 20230609 203739 Gallery
Screenshot 20230609 203630 Gallery

And yes, you read correctly. This is a monitor!

Screenshot 20230609 203658 Gallery

The story is this came from the old Ashington hospital (which closed in 2004). When the hospital got the first internal camera system for operations this was used as the monitor for it. I'm not sure when it was retired but it appears to be very low hour and probably hadn't been used for a long time when the hospital finally closed.

Before I picked it up I was shown it working and it has a good strong tube. It has a hum bar after a few minutes of warming up so I'd like to give it a good inspection before I power it up again. 

 
Posted : 09/06/2023 7:59 pm
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slidertogrid
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I have never seen a monitor version. Does it look factory or an aftermarket conversion? 

 
Posted : 10/06/2023 8:47 am
crustytv
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mfd70
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My set seems low hour and gives a really good picture, I'm sure it had an LWT asset sticker on the back but it seems to have gone, probably fallen off and gone up the vacuum or down the cat(s). It iis based on KV1300 with an isolation transformer, the PSU and line output circuitry is very reliable but not robust, using a variac will kill the PSU, and I was advised not to adjust line hold or any other controls in the line stage whilst operating since intermittent tracks will cause instant and catastrophic failure ! Still mine seems to work OK  despite probably being as old as me.

 
Posted : 10/06/2023 10:51 pm
slidertogrid
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Interesting that they produced a monitor version. I have seen some sets converted including a Thorn 1400 'portable' that had a valve input amp fitted. Sony must have had a market for them, I remember some later larger screen Sonys with input sockets on them pre dating scart by a long way.  

I had a few of the standard 1330s I bought second hand when they were quite old they sold well for computer sets and second sets. I don't think I ever had one back for repair but I do remember the tubes weren't brilliant which is probably why they were disposed of.

 
Posted : 11/06/2023 8:58 am
Hurty
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We had quite a few of the CVM-1330UB's at Thames Television Euston and Teddington. I was based at Euston Studios and one of these resided in the maintenance workshop for monitoring "off air" and had the 8 pin VTR cable arriving on one of the benches as I used to service the Sony and JVC U-matics machines whilst plugged into this cable. These Sony monitors where used in some of the offices for providing commercial and program pre-viewing. using U-matics. They where indeed based on the KV-1330's with the addition of the mains isolation transformer to allow the chassis to be earthed, three wire mains lead, and with the addition of the input selection switches, video i/o circuitry and switches, this was as supplied by Sony. the later Sony's that provided this facility where the CVM-1850's, again with the 8 wire VTR socket and BNC inputs and outputs, not the SO-239 sockets as used on the 1330s. Picture of me on the left and a college Tony on the right in the Euston workshop, monitor used to be up on the corner shelf right, off picture.

EK 0081

 Enjoy

 

 
Posted : 11/06/2023 1:17 pm
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Cathovisor
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@hurty Now I can see where Peter gets his looks from!

Unsurprisingly we had a few in the Beeb as well.

 
Posted : 11/06/2023 5:24 pm
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WayneD
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So first thing I removed was the large smoothing can with two capacitors:

20230620 130128

Whilst it tested ok I replaced with a modern 600uF Nichicon for the 550uF and a smaller 10uF Nichicon just to be on the safe side:

20230620 102522

Alas, the problem still persisted so I had a look at the board behind the video ports (which is also where the isolating transformer is) and erm...

20230620 105037
20230620 105959
20230620 123700

Well there's ya problem! 😱

So, did I mention I like Nichicon capacitors?

20230620 122341

Power up again and:

20230620 125113
IMG 20230620 125741

 That's a seriously nice picture! As usual, my phone doesn't do this justice. 

 
Posted : 20/06/2023 12:41 pm
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sideband
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Can't go wrong with a Nichicon....(I'm sure that's a parody of another advert...)?

 
Posted : 20/06/2023 1:23 pm
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WayneD
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@sideband all I can think of is the Viz advert "You can't miss with Armitage Shanks" 🤣 

It's funny, when I'm arguing with people about changing capacitors they often mention "ripple currents" and start quoting a load of stuff they've obviously just Googled. Thing is, using Nichicons it's pretty much guaranteed that they'll be beyond any spec that the TV originally had, especially the light blue "BT" series as they're 125 degrees C military spec.

 
Posted : 20/06/2023 1:59 pm
Cathovisor
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Now, normally I'd have Nippon Chemicon down as a "good" brand... but the HP/Compaq P4 motherboard I had to recap around the processor used these too and with similar failure.

I do read up on ESR and ripple current when choosing an electrolytic - when I know it's being used in a switching regulator because that's when it can get embarrassing. Also ripple current at 120Hz and >10kHz can be remarkably different.

 
Posted : 20/06/2023 3:07 pm
WayneD
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@cathovisor these are at least 50 years old so I can kinda forgive them! 

The sort of ripple current that the average TV deals with isn't really going to tax a Nichicon. Anything is probably a huge improvement on 50+ year old capacitors.

 
Posted : 20/06/2023 4:04 pm
Lloyd
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That glue round them probably helped them rot as well! Had a Sony camera full of the damn stuff… 

one of my 1330’s had a few caps who’s legs had rotted off, mostly affecting the pin cushion settings. I haven’t fired either of them up for ages, I bet there will be more trouble in store!

Regards,

 Lloyd 

 
Posted : 20/06/2023 4:23 pm
Cathovisor
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@wayned I'd be very careful making statements like that, you just never know - although admittedly performance has improved in relation to size. The reason I mention ripple current is because a lot of caps - especially the low ESR ones for SMPSUs - offer very impressive ripple ratings at say, 10 or even 100kHz, but pretty poor at 100/120Hz.

 
Posted : 20/06/2023 4:50 pm
WayneD
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@cathovisor this is why I only really replace capacitors in small batches, test the TV and if a problem occurs I can swap them back again. Don't think I've ever had to do this though.

I always check both the old and new capacitors on my tester, occasionally I'll find a new capacitor that has a worse ESR than the original but I can't recall it ever being a problem. Certainly on 60s and 70s stuff. 

 
Posted : 20/06/2023 9:33 pm
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Cathovisor
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@wayned That's the trouble - I'm of an age where I think "70s? That's new!" and ignore the fact that's circa fifty years ago. When I started in this nonsense, "fifty years ago" was 1931...

Don't bear thinking about, does it? 

 
Posted : 20/06/2023 11:08 pm
WayneD
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Show 'n Telly episode 2 featuring this very TV:

 
Posted : 11/07/2023 10:01 am
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