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Baird 8778 just arrived

 
TVJON74
(@tvjon74)
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Hi all,

I managed to pick this Baird 8778 up today. According to the Thorn chassis guide this uses the 9000 chassis.

Looks in quite a reasonable cosmetic condition although the front controls appear to be stuck.

No Idea what the inside is like yet though.

Here are a few pictures.

Front of set
Controls
Rear label
Old mains plug

From what the seller told me and the rear label this set has moved around a bit during its life. Rear label says property of Radio Rentals Swindon, it was owned by a chap in Dorchester and was picked up in Weymouth. Also according to the seller loads of items in the house still had round pin plugs fitted!

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Topic starter Posted : 04/01/2019 2:27 am
Nuvistor
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Some more info on the 9000 chassis.

https://www.radios-tv.co.uk/1975-multibroadcast-7773/

https://www.radios-tv.co.uk/thorn-9000-fault-finding/

 

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Posted : 04/01/2019 9:43 am
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TVJON74
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Hi Frank,

I was having a look at those very pages yesterday.  ? 

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Topic starter Posted : 04/01/2019 11:58 am
Jayceebee
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Luckily it has the later type channel selectors fitted, the original touch type were very poor. Good luck with it. ? 

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Posted : 04/01/2019 12:36 pm
PYE625
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I have to admit to being quite excited and keen to see the progress. Quite a technically challenging chassis.

Well done thus far for saving the set. ? 

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Posted : 04/01/2019 4:49 pm
Doz
 Doz
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I hated these... only for the simple reason I used to spend ages sorting the damn things, only to find the tube was as flat as a pancake.

I don't think I've ever seen one with a good CRT 🙁

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Posted : 04/01/2019 4:54 pm
Doz
 Doz
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... oh and don't leave the pipe-lagging off, they hiss like a snake without!

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Posted : 04/01/2019 4:55 pm
TVJON74
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Posted by: Doz

... oh and don't leave the pipe-lagging off, they hiss like a snake without!

Pipe lagging??

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Topic starter Posted : 05/01/2019 2:13 am
TVJON74
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So while the other half is out I thought I would quickly whip the back off and have a peek inside.

Now I'm not familiar with this chassis at all, but I can't see any obvious signs of repairs being done in the past.

A nice layer of dust over the PCBs and metal work that should clean up nicely.

Here are some pictures of the internals.

Chassis
LHS comp
LHS print
BOT comp
BOT print
RHS comp
RHS print
Control
Tube base

I found the CRT label on the bottom of the cabinet, not sure if that is the original CRT or not.

CRT label
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Topic starter Posted : 05/01/2019 2:27 am
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Nuvistor
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Thorn had ties with RCA, hence the Skelmersdale Thorn CRT factory which was part owned by RCA and used some RCA technology. It supplied most of Thorn’s requirements for the larger colour CRT’s. These were delta CRT’s, the factory closed for various reasons, one was the unwillingness, for whatever reason, to upgrade the factory for the later type inline CRT’s.

 

It is quite possible that the CRT was supplied by a RCA factory in Canada. I saw virtually no Thorn colour TV’s but those who did will probably know it’s origin.

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Posted : 05/01/2019 9:06 am
crustytv
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Posted by: TVJON74
Posted by: Doz

... oh and don't leave the pipe-lagging off, they hiss like a snake without!

Pipe lagging??

Doz is referring to the tubular foam insulation on the EHT cable. Regarding the use of RCA tubes, indeed this is to be expected, they are fitted to one or two of my 9K examples.

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Posted : 05/01/2019 10:11 am
PYE625
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A good sign is that the chassis seems not to have been affected by any damp.

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Posted : 05/01/2019 11:40 am
TVJON74
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Posted by: crustytv
Posted by: TVJON74
Posted by: Doz

... oh and don't leave the pipe-lagging off, they hiss like a snake without!

Pipe lagging??

Doz is referring to the tubular foam insulation on the EHT cable. Regarding the use of RCA tubes, indeed this is to be expected, they are fitted to one or two of my 9K examples.

This set does not seem to have this fitted. What was the purpose of the foam?

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Topic starter Posted : 05/01/2019 11:53 am
crustytv
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Its not something new to the 9K, the foam tubular insulation on the tripler EHT lead is also to be found on the 3K- 3.5K have a look at my TV blogs and you will see all have it fitted. As to why it was fitted to the 3K & 9K series etc and not the 2K, 8K, who knows you'd have to ask Thorn. 

The foam degrades over time and disintegrates so likely why yours has long gone. I've used the grey plumbing insulation foam in such cases.

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Posted : 05/01/2019 12:08 pm
Red_to_Black
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Have a look at the cabinet styling on this NZ version of the 9K here: https://www.vintage-radio.net/forum/showthread.php?t=104474

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Posted : 05/01/2019 1:44 pm
malcscott
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The foam tube may have been left off when the tripler was replaced. The triplers fitted from new were blue, Malc.

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Posted : 05/01/2019 2:36 pm
Jayceebee
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Posted by: TVJON74

This set does not seem to have this fitted. What was the purpose of the foam?

It's to prevent corona discharge. Without it any leads brushing up against the bare feed to the tripler will  produce the hissing as Doz describes, also the smell of ozone and in darkness you will see the usual purple glow.

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Posted : 05/01/2019 9:19 pm
glenz75
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Posted by: Red_to_Black

Have a look at the cabinet styling on this NZ version of the 9K here: https://www.vintage-radio.net/forum/showthread.php?t=104474

Hi all, this is my Thorn 9000 mentioned in the link, in fact I found I did post a write up about it on here too ? https://www.radios-tv.co.uk/community/colour-television/thorn-9000-series-9200-the-nz-version/#post-64023

Still have this set and have done nothing with the thing since I got it a few years ago, but now have a proper workshop area being setup as we speak so there maybe some activity in tinkering with my old TV's again. ? 

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Posted : 17/01/2019 12:31 am
crustytv
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Posted by: glenz75

[...] in fact I found I did post a write up about it on here too ?

Hi Glen,

indeed you will find all your previous posts here, as will all the other old members of Vrat find theirs. This is because this forum is in essence, the old Vrat forum, just in a set of new clothes. You can read about the project that achieved this feat here .

Great to have you back with us  ? and I/we, very much look forward to seeing more of your interesting projects when your new workshop is up and running.

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Posted : 17/01/2019 8:38 am
glenz75
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Hi Chris, yes I discovered all my old posts not long after replying with the link! Thanks for the welcome back its been a long time since I've done any TV projects due to everything being in long term storage and I have 'several' sets waiting to be worked on/revisited/ ones that were half going 4 years ago etc.. ? 

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Posted : 18/01/2019 1:11 am