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1975 26" GEC 2147 : Series 2110 Chassis

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Doz » Sat Feb 27, 2016 12:56 pm

405 fan wrote:Hi everyone
I resumed restoration on the set this morning having fitted the BU108 the set then started up , but just as the picture started to appear the tripler went . I'm now stuck again as I haven't got a universal tripler . Can anyone help ?.
Regards. Gary.


I feel your pain... can you post a picture up of the tripler. I won't have a universal one, but I might have the correct one for the job...

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 27, 2016 1:00 pm

Hi
I now need a tripler so restoration is on hold again . It's got sound,tube heaters and the neons don't flicker .
Regards.
Gary.

failedtrip.jpg

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Sat Feb 27, 2016 2:27 pm

Hi Gary,

Fear not, all is not lost. One GEC Tripler ( REMO Branded) ready and waiting for you FOC. Collect whenever you want, even today if you so wish.

gectrip.jpg

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 27, 2016 2:38 pm

Hi Chris
That very kind of you , that's the exact one .
I'll set off shortly if that's ok .
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Sat Feb 27, 2016 2:42 pm

See ya soon, we'll have a picture on your set before the end of the day :thumb

One thought.... There's not a tripler killing condition that might be present is there? I would hate for you to have this one fried too. I have the GEC service manual for the TV here so will pour over it whilst waiting for you.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Sat Feb 27, 2016 2:42 pm

NEWS FLASH! Hi Gary,
Found this ITT make tripler. The EHT lead is thirteen inches long. I reckon it's the type you are looking for.

Till Eulenspiegel.
Attachments
000_0042.jpg

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Sat Feb 27, 2016 2:51 pm

Well David is closer so it will be a lot quicker to nip over his. No problem if you decide that's easier and/or preferable to the GEC Tripler.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Sat Feb 27, 2016 5:24 pm

The original solid state GEC colour TV chassis was introduced in late 1972 and employed a 5amp mains fuse. When the power supply board was modified to slow start the value of the fuse was reduced to 3.15amp. The slow start circuit is the familiar arrangement with an NPN transistor connected across the 7.5 volt zener diode which is in series with the emitter of the control transistor and ground. A 1microfarad capacitor is connected between the collector and base of the slow start transistor. A 1N4148 type of diode is connected between the base and emitter functions as a rapid discharge path for the slow start capacitor when the set is switched off.

Early power supply boards can be modified to slow start. This type of modification was introduced by many service engineers into the PSU of the Bush A823. I kinda remember LEDCO made a replacement PSU for the A823 which incorporated the slow start circuit.

Till Eulenspiegel.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Rebel Rafter » Sat Feb 27, 2016 7:13 pm

Hi, from RR. For triplers try Irwin electronics, they've got lots of old TV parts or else try vintageparts.com, I got a rare i.c. from them for my little Panasonic portable, and then there's Donberg electronics in Ireland, they have lots of obsolete stuff, but you'll have to pay in euro's. Also I see you're using a dodgy looking socket extension, I've had lots of trouble with them because of poor contacts in the sockets which arc intermittently and they play havoc with old 70's TV's , especially when they've got a thyristor in the power supply, they don't do solid state line o/p's a right lot of good either. I use Permaplug extensions, they're made to industrial standards and the only place I know where you can get them is CPC near Preston, Lancs., RR.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Sat Feb 27, 2016 9:24 pm

Hi Gary,
I've no 5200pF flyback tuning capacitors, however there one 6300pF 1-5KV capacitor available. All we have to do is calculate the value of a series capacitor to reduce it's value to 5200pF.
30,000pF is about right. Values in KpF: 6.3 X 30 = 189 divide by 36.3 = 5.2066. Doesn't get much better than this.

Till Eulenspiegel.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 27, 2016 9:57 pm

Hi David
Thanks for that , I think the green NOS ones break down . The one I put in gets hot .
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Mon Feb 29, 2016 3:12 pm

Members interested in early colour might be interested in the following bit of trivia.

This model GEC was formally known as the "2113" and retailed at £327. It was subsequently re-branded as the model "2147" with a significant price drop to £233. It went head to head with fifteen other 26" TV's back in 1974 in a "Which" report. It passed all the safety tests and was considered the "Good value for money" set along with a G8 (£221). The "Best Buy" for 74 however although dearer was the Rediffusion CU2611 at £270. Also remember adding £8.64 to the price should you have wished to extend the CRT warranty from 1 to 4 years.

For those interested, the whole 26" showdown is here http://www.radios-tv.co.uk/1974-report/ There are many other such reports covering 68 - 82. I hope to fill the gaps in these fascinating glimpses of CTV history, adding more as and when I can obtain them.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Mon Feb 29, 2016 5:11 pm

Hi everyone.

I'm on a weeks holiday so I've done a little more on this set. Before I'd fitted the tripler kindly given to me by Chris the fuse blew after some smoke from the power supply panel. One of the main smoothers had vomitted it's insides out so I've replaced it . It's just a bog standard 600uf 300v, I then had a stable 195v.

The Bu108 had shorted again so was replaced, probably blown by the unstable H.T. I now have a picture which is very good as the tube is good. However there is no frame sync. Also the horrible green 5n2 cap started to leak it's electrolytic
Again so I quickly switched of . These NOS 5n2 caps I have are rubbish. I'll just have to wait for the one's that I ordered last week.

Never mind I'm nearly there . Any hints on the frame sync?

Regards.
Gary.

aa4.jpg

aa1.jpg

aa2.jpg

aa3.jpg

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Mon Feb 29, 2016 5:15 pm

405 fan wrote: However there is no frame sync.........Any hints on the frame sync?
Regards.
Gary.


Yes check these likely culprits. D401, C452, TR451 ( BC147) and IC401 (TBA920Q)

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by ntscuser » Mon Feb 29, 2016 5:29 pm

Frame-sync apart that picture is already looking good! :aad

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Focus 2 » Mon Feb 29, 2016 6:21 pm

Wow! That takes me right back to 1976! Once you've sorted out the frame sync it looks like a good working set there.
Brian

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by malcscott » Mon Feb 29, 2016 7:03 pm

4.7mfd cap on t/base pcb was common cause for no frame sync, Malc.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Mon Feb 29, 2016 7:08 pm

That's C452 I already mentioned above dmm

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Mon Feb 29, 2016 8:42 pm

Stock fault, used to do the fix on house calls. C452, that's the one, it's all coming back.

Till Eulenspiegel.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Tue Mar 01, 2016 4:14 pm

Hi everyone,

Today the saga continues, C452 4.7uf was the cause of the frame sync. I now have a good picture, I must say the convergence and grey-scale are very good for a set that has been out of action for many years . The only problem left to sort is the 5n2 fly back cap, it starts to bubble after 5 minutes use. I've replaced it 4 times with one of my NOS supply green ones that I purchased a few years ago. I'm a bit dubious that surely they can't all be leaky. Mind you I did replace 2 of them in a G8 last year and they too started to bubble. I'll just have to wait for the new ones that I ordered.

Regards.
Gary.

gec-1.jpg

gec-2.jpg

gec-3.jpg

gec-4.jpg

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Cathovisor » Tue Mar 01, 2016 4:24 pm

Gary, have you tried putting some of your NOS ones on a bridge to see what value they come out as? I'm beginning to think the best place for your stock of these is the large black lidded vessel that gets emptied fortnightly...

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Tue Mar 01, 2016 4:37 pm

Hi Mike I think your right, they are going in the bin .
I haven't tested them . I'm waiting for some coming from that link you kindly sent . Then I think the jobs complete.
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Cathovisor » Tue Mar 01, 2016 4:43 pm

I have to say, the last time I ever saw a cap "bubble up" as you describe was the wax paper dielectric screen grid decoupler on the RF amp of my Murphy TA160 - way, way back in 1981!!

The bin's the best place for them. Here's hoping Cricklewood come up with the goods for you. :thumb

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Tue Mar 01, 2016 4:52 pm

Gary next time you're down this way bring those green caps with you and I will test them for you on my bridge and insulation tester.

I can test up to around 600V via the bridge and 1kV insulation test on the Mega. However I'm unable to test at the full 1.6kV rated load which is where they might be breaking down or close to that.

Still it will be interesting to see what results we get.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Tue Mar 01, 2016 5:01 pm

Hi Chris
Thanks I will bring them over some time . I was beginning to think that there was another fault in the set causing this but these green caps are unreliable.
Regards.
Gary.

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