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1975 26" GEC 2147 : Series 2110 Chassis

 
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1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 20, 2016 2:28 pm

Hi everyone,

I've been to Wakefield this morning to collect this 26" GEC colour 2147 that I bought last weekend. It's in good condition and complete with stand . I'll power it after lunch and let you know.

Regards
Gary

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gec2147-d.jpg

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by ntscuser » Sat Feb 20, 2016 3:08 pm

Didn't GEC used to boast that you could buy one of their 26" sets for the same price a 13" Japanese portable? ttt:

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by marc » Sat Feb 20, 2016 3:10 pm

Hi Gary,

It certainly looks better the right way up and back on it's stand instead of plonked on it's side in my hallway ! :)
Looking forward to seeing it working.

Cheers,
Marc.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 20, 2016 3:14 pm

Hi
The 3ohm resistor feeding the dropper has sprung and the 3-15A fuse has gone gently so there must be a short . I'll check the line opt transistor and the 45v zener across it for short.

Gary.

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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 20, 2016 3:21 pm

Hi,

Our old friend the green 5n2 has flipped it's lid and killed the BU208 so it should be an easy fix .

Gary.

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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 20, 2016 4:16 pm

Hi
Can anyone please confirm whether a 2N3902 would be a suitable replacement for a BU108 line output transistor?. I have new pack of these and think that I bought them as BU208 equivalents.
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Sat Feb 20, 2016 4:34 pm

405 fan wrote:Can anyone please confirm whether a 2N3902 would be a suitable replacement for a BU108

According to my data no, its underrated

BU108 = 1500/750V,5A,12,5W(Tc=95°)
2N3902 700/325V, 2,5A, 100W(Tc=75°)

BU108 equivs :-
  • BU208
  • SC2928
  • 2SD350(A)
  • 2SD820
  • 2SC1145
  • KT839A

If you've not got a BU108 I would stick in a BU208 that's if you've got one ( I have a spare if you need one), if not any from the list will do.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 20, 2016 5:12 pm

Hi Chris
Thanks for the info , I'm nearly sure I ordered BU208's and the company sent these instead. I'll have to order some BU208's so the restoration is stalled for now.
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Sat Feb 20, 2016 5:46 pm

Well if you're going to order then why not order the original BU108's you can get the T03 package for £4 delivered http://www.ebay.co.uk/itm/1-PC-BU108-NP ... SwNSxU9iL-

or

If you're not bothered about originality you can get the T0126 package BU108, 5 for £7.23 delivered http://www.ebay.co.uk/itm/BU108-Transis ... Sw6aVUmrr8

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Cathovisor » Sat Feb 20, 2016 5:47 pm

What will you replace the 5n2 with?

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by crustytv » Sat Feb 20, 2016 6:06 pm

I'm not sure how critical the cap value of 5.2nF is. I suspect the cap in question is the harmonic tuning cap?

You can get 10 x 5.1nF 1600V delivered free for £2.04. I've bought from this seller before and they are reliable

http://www.ebay.co.uk/itm/10-Pcs-5-1nF- ... SwTapV4L3b

what's .1nf between friends and the LOPT health.......I'll leave others with far more experience to decide if it would suffice. If not then you will have to get creative and parallel up some more readily available values to get your 5.2nF.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Cathovisor » Sat Feb 20, 2016 6:14 pm

Whilst the voltage rating is good, caps with polypropylene dielectric are much better suited to dealing with pulse waveforms - polyester is best for decoupling DC rails.

http://www.vishay.com/docs/26033/gentechinfofilm.pdf

Not axial-leaded sadly, but: http://www.cricklewoodelectronics.com/CKK5N1.html

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by malcscott » Sat Feb 20, 2016 6:34 pm

Hi Gary, loads of nos BU208/A here, Malc.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 20, 2016 7:58 pm

Hi malc
thanks for your kind offer but I've already ordered some BU108's , 208's and those 5n2 caps that Chris alerted me to so I should be well stocked up for next Saturday's thrilling instalment.
Regards.
Gary

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Rebel Rafter » Sat Feb 20, 2016 8:23 pm

Hi, from RR. Is that GEC one that has a touch channel selector? Luckily it looks like it belonged to a non-smoker so it's not full of dreadful nicotine which really messes up touch selectors. I usually had to strip the whole thing down and thoroughly clean all of it and replace the chip and all the neons to get it to work if it had been caked in nicotine. Will you totally strip the whole set and clean everything? That's what I used to do when I used to refurbish them to sell. I even used to take all the coils off the tube neck and remove the scan coils from their housing and clean out all the muck inside and then take the tube out and thoroughly clean it all over and thoroughly clean the degaussing shield inside and out and also strip the whole cabinet down as far as possible and clean every part. And I would thoroughly clean and fully service every panel and the bare chassis and other bits like the tripler, focus pot, etc. I'd especially clean all the high voltage bits. RR.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Tazman1966 » Sun Feb 21, 2016 9:53 am

Morning Gary and congratulations on nabbing a goodie. The caps that Cathovisor put in a link to Cricklewood Electronics are the same type I've used in this position in the past with no problems.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sun Feb 21, 2016 10:42 am

Hi Tas
Thanks for that , I'll order some . The set was purchased by the seller from new and used until it stopped working and then put in a spare room .
Looking at the chassis it seems to have been reliable as its thick with dust.
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Wed Feb 24, 2016 10:30 pm

The plastic encapsulation BU508A can be used as a replacement for the BU108 and BU208, although it's much better to use the TO3 cased BU208. I accepted the first delivery of the plastic cabinet C2110 and C2111 in late 1972, the first GEC all transistor colour TV set. The 20 and 22" versions of the C2147 were well received by the buying public. Hi Gary, if you need any Hivac 3L neon lamps I've still got some left over stock of these.

Till Eulenspiegel.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Thu Feb 25, 2016 1:18 am

Hi David
Thanks for the advice , I ordered some Bu108's from a firm on ebay and they arrived yesterday. I bear the neons in mind . I had the 22" version in my bedroom years ago and the neons used to flicker all the time . I read years later that the cure was to replace all six of them. We'll see how it performs on Saturday when I resume it's restoration.
Regards.
Gary.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Focus 2 » Thu Feb 25, 2016 10:35 pm

Nice find. Looking forward to hearing how you get on with the set. My first encounter with a 2110 was in 1976 when Rumbalows installed one when the dreaded Ultra 3000 went for its first replacement CRT. The GEC was a much better set all round. I was sorry to see it go.
We could receive Yorkshire TV using an aerial for Bilsdale in Sedgefield. Reception varied from "bad black and white only" to good colour on other days. With the GEC constant colour reception was obtained.

I remember a 22" version still in use in 1990. The CRT was clearly in need of replacement and yes, the neon's flickered.

I obtained a British Relay Tv branded version in 1995. Excellent set.
Brian

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Fri Feb 26, 2016 1:22 pm

I didn't have the 26" C2147 in my rental fleet but there was loads of the 20 and 22" models. GEC recognised the problem with the line flyback tuning capacitor and service department supplied a complete assembly comprising the line OP transistor, the capacitor and the metal plate.
Those channel indicator neons? soon learnt the best policy was to change all six of them.
Certain Bush and Murphy A823 sets employed Hivac 3L neon in the varicap tuning system, whereas in the GEC the neons simply functioned as program indicators, in the A823 the neons did actually do the channel switching.

Till Eulenspiegel.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by slidertogrid » Fri Feb 26, 2016 8:34 pm

Focus 2 wrote: I obtained a British Relay Tv branded version in 1995. Excellent set.
Brian

Did Relay ever do an aerial version or was it one that had been converted from a cable set ?
The reason I ask is that I bought a batch of ex relay sets from a scrap man in I think 1982. He had three lock up garages full of sets but they were all the cable version. They were easily converted with just an IF/Tuner panel and a push button unit. (these were all the 20" plastic cabinet version).
Relay had an interesting solution to cracked and scruffy plastic cabinets. The whole set was fitted into a Fablon covered wooden box so that all you saw was the front of the set. The plastic cabinet was rather crudely held in place by wood screws at odd angles through the plastic into the wood from the inside.
It looked as if a soldering iron was used to make the holes..
The good news was that nearly every set had been fitted with a Mullard Colourex regun tube. I converted the best sets by buying panels from smashed sets from John Carters, he had plenty of those!
A friend also bought a batch and converted them by buying the remaining stocks of IF tuner panel that GEC held. He had a mate who was TLO for GEC so I think he may have got a deal!
They were reliable sets really apart from the tuning cap, neons an that power supply ! I had one that blew it's line osc chip every few months. I gave up in the end and changed the power supply panel, the osc panel, line board and tripler from a scrap set. That cured it!
I will follow this thread with interest, It looks in fantastic condition! Good luck with it!
:thumb
Rich.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Rebel Rafter » Fri Feb 26, 2016 9:07 pm

Hi, folks, RR here again. It's good to see you've got one of the better GEC sets with the wooden cabinet, I thought the plastic ones were dreadful, I was always finding them seriously broken with great big chunks missing, but they were a good source of spares and sometimes had good tubes too. I thought they would melt at the top with all those droppers so close at the top. I always thought the power supply on that chassis was awfully crude, the whole lot consuming 220 watts whereas the Rank A823 only took 165 watts or so the labels said anyway, I tried measuring one once and blew up my meter in the process with the switch on surge, I forgot to allow for that! RR.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by Till Eulenspiegel » Sat Feb 27, 2016 12:47 am

The first solid state GEC colour TV chassis was an excellent design except for the power supply. Like the Bush A823 and the Philips G8 the GEC employed a thyristor to perform the function of HT regulation. The operation of this circuit is well known, the thyristor conducts only on the latter part of the positive half cycle of the mains supply, not nice.
A later development of this chassis employed a switched mode power supply which was supplied by a bridge rectifier, much, much better. Models C2218H and C2618H.

Till Eulenspiegel.

 
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Re: 1975 26" GEC 2147 : Series 2110 Chassis

Post by colourmaster » Sat Feb 27, 2016 12:30 pm

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

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