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Forum 139

CTV GEC 2030A

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The_Teleman
(@the_teleman)
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Today I thought I would have a go at this lovely GEC dual standard colour set , his set has been in my collection for many years after rescuing it from a guy in Scotland that wanted to turn it into a drinks cabinet . 
the set is the 2030A dual standard colour from about 1967 ish , it’s in beautiful condition inside and out and it’s 100% complete with it’s original legs 

I powered the set up for the first time last week as I was going to move it on 

but when it came on with such a vibrant picture I decided to keep it 

the set had a fault only to be extended after all this time , short frame and frame slip 

the fault was traced to 4 resistors in the frame circuit gone high in value , up to now NO capacitor has been replaced and this is the result

IMG 3148
IMG 3149
IMG 3150

 

 
Posted : 02/10/2023 12:17 pm
ntscuser, Till Eulenspiegel, Lloyd and 2 people reacted
Doz
 Doz
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Interesting. Mine doesn't have that screen round the line output/ boost diode valves, even though it still had a (clapped out) pl504 in the line

 
Posted : 02/10/2023 2:04 pm
The_Teleman reacted
The_Teleman
(@the_teleman)
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@doz I’ll have a look to see if my 2028 has that screening can I’m not sure it does

 
Posted : 02/10/2023 7:19 pm
Doz reacted
sideband
(@sideband)
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Posted by: @the_teleman

up to now NO capacitor has been replaced and this is the result 

 

It looks like it's got the good old Mullard Mustards in it. I doubt if any of those are faulty. 56 years and counting....!

 

 
Posted : 02/10/2023 9:17 pm
Till Eulenspiegel
(@till)
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I'm busy restoring my GEC 2028 to full dual standard operation. I have to confess in the late 1970s the system switches were removed to improve reliability. This was a common practise in those times. I now have a spare chassis which will be used to donate parts to the made in 1967 TV set. The set has been in my possession for fifty-five years.

Till Eulenspiegel.

 
Posted : 03/10/2023 11:40 am
RichardFromMarple
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I've heard of many dual standards having their 405 line functionality dummied out, with the switched hard wired to 625 lines.  Often on rental sets this was to make maintenance simpler. 

 
Posted : 03/10/2023 9:49 pm
Doz
 Doz
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Posted by: @the_teleman

@doz I’ll have a look to see if my 2028 has that screening can I’m not sure it does

mine's a 2028. 

 

 
Posted : 04/10/2023 8:47 am
Tywyn-workshop
(@tywyn-workshop)
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Is this the chassis that had a stock fault of one of the PAL switch bistable BC108 transistors failing, giving alterate red lines on the picture? I last worked on colour TV's in 1971 when, after finishing my apprenticeship and had a few years in the workshop, I landed a job at my Local University as an Electronics technician.

 
Posted : 10/12/2023 3:00 pm
Jayceebee
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Hi and welcome. I have never worked on the GEC hybrids but a stuck bistable would give severe Hanover blinds on the chroma. I cut my teeth on Bush/Murphy A823 and the single chip decoder was prone to the bistable locking on the wrong phase giving reversed colour often after a channel change, stab the button a couple of time and it would lock correctly.  Usually careful adjustment of the ident control solved it but sometimes needed the two BC148s changing.

John.

 
Posted : 12/12/2023 5:04 pm
Michael Dranfield
(@michael-dranfield)
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Can't remember the model but there was one GEC hybrid where you could take out the whole croma board and the set still worked fine in black and white. 

 
Posted : 14/12/2023 9:13 pm
malcscott
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The BRC 3000/3500 would still display a mono picture with the chroma board removed.

 
Posted : 14/12/2023 9:41 pm
crustytv
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Posted by: @michael-dranfield

Can't remember the model but there was one GEC hybrid where you could take out the whole croma board and the set still worked fine in black and white

Don't know about GEC, but a hybrid that works as mono with the decoder removed was the ITT CVC1 & CVC2. Every time I look at its decoder, (see below and example in my collection) I just find myself asking who on earth thought it was a good idea to create such a monstrosity!

Especially when everyone else had sanely moved to PCB, however, ITT ploughed on trying to convince the public, or maybe themselves that "hardwired" was synonymous with quality, I suppose at the time in the sea of manufacturers it was at least a singular USP. 

I pity the poor service tech!

ITT CVC1 Decoder Date : June 1970

20231215 100732
20231215 100742

CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
Crustys Youtube Channel: My stuff
Crusty's 70s Lounge: Take a peek

 
Posted : 15/12/2023 10:12 am
RichardFromMarple
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After large screen black & white sets became hard to source, some rental companies could decolourise sets be disabling the colour signal for customers who didn't want to rent a colour set. 

 
Posted : 15/12/2023 10:19 pm
Nuvistor
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Posted by: @richardfrommarple

I've heard of many dual standards having their 405 line functionality dummied out, with the switched hard wired to 625 lines.  Often on rental sets this was to make maintenance simpler. 

Not with CTV’s but I did this with a few mono ones were the switch was faulty, arcing, poor contacts etc. For the most part we had a good UHF signal in the area so dual standard sets with push button tuners made it an easy decision. It gave the set a few more years of use.

 

 

Frank

 
Posted : 16/12/2023 8:24 am
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