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Old 21st Jan 2016, 4:50 pm   #21
FERNSEH
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Default Re: Odd fault with GEC 2028

I've got to agree about that. Right from the start I noticed that the colour difference CRT drive sets always displayed a better picture compared with the RGB only sets.
I was never all that keen on the G6 but I have to admit the colour pictures were always excellent. Even the ghastly Decca CTV25 displayed good picture quality.
GEC was always clever at marketing. Introducing a reasonably priced 19" CTV in 1967 when the all the other manufactures offed only big 25" models was a clever move. Even Radio Rentals a firm which had their own manufacturing facilities offered the Baird 705 which was of course a rebadged GEC 2028.

DFWB.

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Old 21st Jan 2016, 4:53 pm   #22
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Default Re: Odd fault with GEC 2028

As a TLO at GEC I received a complaint about a 2028, the owner very upset with a service organisation who told her the tube was gone. The service organisation told me the customer was a real pain considering the set was at that time around 15 years old.
I had a word with my boss and requisitioned a new old stock 2028 receiver from the stores as we kept a few just in case. After getting it soak tested and set up in the Wembley workshop, I took it down to the south country and surprised everyone with a gift from GEC. I told their customer she was a very lucky lady.
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Old 21st Jan 2016, 5:32 pm   #23
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Default Re: Odd fault with GEC 2028

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Originally Posted by Nuvistor View Post
Surprising how good the colour pictures were on some early CTV's, I think the CDA drive as opposed to RGB drive helped. Thats just an opinion though, perhaps the sets I saw with RGB drive were not quite not the best although new and set up correctly.
Perhaps the CDA output stages were better because the manufacturer could put more resources into designing and building one high quality wide band output amplifier for the luminance stage? The difference output stages needing to only have a bandwidth of approximately 1mHz.

RGB requires three wide band output stages of course.
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Old 21st Jan 2016, 5:42 pm   #24
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Default Re: Odd fault with GEC 2028

Possibly Colin, but the colours themselves seemed brighter and clearer, not a matter of just bandwidth. I don't know but there was definitely a difference, oh dear a pun.
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Old 21st Jan 2016, 6:08 pm   #25
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Default Re: Odd fault with GEC 2028

Your right of course Frank. A manufacturer has to get a lot of things right in order to end up with a good picture from the final product. I remember being impressed with the picture quality of the 2028.

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Originally Posted by FERNSEH View Post
I was never all that keen on the G6 but I have to admit the colour pictures were always excellent.
I was service manager for the Enfield Highway Co-operative Society in the early days of colour TV. I was lucky enough to buy an ex-rental one (G25K500) from the company for its depreciated value (£25!!) when it was 3 years old. The picture was excellent and I kept it for many years.
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Old 23rd Jan 2016, 6:46 pm   #26
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Default Re: Odd fault with GEC 2028

Hi there
I agree about the RGB vs CDA. I remember when these sets were getting close to the end of their life having a 2028 beside a Thorn 2000 19" ready to go to the auction - they could still make a few quid then (around 1980 - the year, not the price!). Despite my best efforts the 2000 couldn't match the 2028 in picture quality though it was difficult to put my finger on exactly how the GEC was better.
I'd say it was the PL802's characteristics, but then the G6 used a humble PFL200 and in my opinion knocked spots off all the other contenders. The old Bush CTV25 used roughly the same circuit as the GEC and the picture was never that good.
Wasn't there a Luxor chassis that used three PL802s in RGB format?
Glyn
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Old 23rd Jan 2016, 9:42 pm   #27
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Default Re: Odd fault with GEC 2028

The gm of the PFL200 is impressive at 20mA/V, but PL802 is even more so being 40mA/V!

http://www.radiomuseum.org/tubes/tube_pl802.html

Those solid state substitutes for the PL802 were never as good as the correct valve, but late into the seventies the PL802 was becoming a difficult valve to find. Remember the trick of using an EF184 RF pentode?

DFWB.
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Old 24th Jan 2016, 5:07 am   #28
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Default Re: Odd fault with GEC 2028

I don't, but I'd like to know.
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Old 24th Jan 2016, 12:34 pm   #29
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Default Re: Odd fault with GEC 2028

The EF184 is almost pin for pin compatible with the PL802 except that pin six of the EF184 is the internal shield connection and in the PL802 pins six and eight are internally connected to the screen grid.
For the quick fix job cut off pin six on the EF184.
Not a nice solution to valve replacement but it got you out trouble when doing a repair in a customers house. We wouldn't dream of doing such an awful bodge job in the workshop.
The EF184 did not last long in service as the luma amplifier.

DFWB.
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Old 24th Jan 2016, 2:51 pm   #30
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Default Re: Odd fault with GEC 2028

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Originally Posted by Welsh Anorak View Post
...Wasn't there a Luxor chassis that used three PL802s in RGB format?...
I seem to remember that it was a Tandberg not Luxor - maybe!
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Old 24th Jan 2016, 4:31 pm   #31
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Default Re: Odd fault with GEC 2028

I have a PL802T here if anyone wants it for the postage.
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Old 24th Jan 2016, 5:06 pm   #32
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Default Re: Odd fault with GEC 2028

Luxor used 3 x EF184 as CDA amps. Rediffusion sets RT531/22, RT524/26 used this very reliable chassis.The picture quality left the Brc/Philips/Bush etc for dead. The sound was superb as well, Malc.
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Old 26th Jan 2016, 1:28 pm   #33
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Default Re: Odd fault with GEC 2028

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Originally Posted by gec2110 View Post
Any chance of a photo of the chassis ?
Sorry,

I never managed to get pics of the chassis, I'll try to remember tonight, there are some more pics here if you are interested.

Cheers
Lee
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Old 26th Jan 2016, 7:16 pm   #34
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Default Re: Odd fault with GEC 2028

Pictures of the chassis as requested, they're not great as access was a bit impaired.

Cheers
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Old 26th Jan 2016, 7:19 pm   #35
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Default Re: Odd fault with GEC 2028

Thanks for that Lee.
A well constructed chassis
always liked GEC stuff .
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