UK Vintage Radio Repair and Restoration Discussion Forum

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-   -   Baird T5 restoration project. (https://www.vintage-radio.net/forum/showthread.php?t=152005)

FERNSEH 10th Dec 2018 10:05 pm

Re: Baird T5 retoration project.
 
1 Attachment(s)
Check out that fifteen inch diameter CRT. Isn't that one scary thing! Tube is 36 inches from base to screen.
Now I have to find some way of getting it out of the cabinet.

DFWB.

Lloyd 1985 10th Dec 2018 11:56 pm

Re: Baird T5 retoration project.
 
I’m not normally one to be a wuss around CRT’s, but that one is a little scary! And what an interesting set to get to work on, I’m sure it’s going to look fantastic when it’s done :)

Regards
Lloyd

beery 11th Dec 2018 2:55 pm

Re: Baird T5 retoration project.
 
Hi David,

I think that you have only two options:-

1. Lift it out vertically with help and place it vertically into a custom wooden storage frame.

2. Create a frame around the tube whilst it is within the cabinet. Perhaps with some wheels (roller skates?) attached to the tube neck. Then turn the cabinet on its side and ease the tube out.

Personally I think option no.1 is more predictable and safe.

Cheers
Andy

FERNSEH 12th Dec 2018 9:25 pm

Re: Baird T5 retoration project.
 
2 Attachment(s)
Hi Andy,
I reckon option 1 will be the best approach to removing the CRT.
Meanwhile, I'm constructing the special receptacle to keep the tube safe while it is outside the cabinet.
The attachment shows that the CRT is quite easy to lift out. However, what I did find with the T23 it was the reinstallation of the tube that required special care. Guiding the tube neck through the focus coil can be a difficult task.

The tube is a Cathodevisor type 15MW4 and is likely to be a post-war replacement.

Argus25 13th Dec 2018 12:28 pm

Re: Baird T5 retoration project.
 
Wow, That cathode ray tube is really something to behold, a thing of true beauty and a big bubble of evacuated space-time. It is a good thing it is in good hands. Whatever method you use, just do everything really slowly with a good plan and wear safety glasses.

FERNSEH 13th Dec 2018 9:00 pm

Re: Baird T5 retoration project.
 
2 Attachment(s)
-also a face visor for extra safety.

And here it is, the special cradle to be used to keep the CRT safe and secure while it is removed from the set.

DFWB.

Heatercathodeshort 13th Dec 2018 9:16 pm

Re: Baird T5 retoration project.
 
What is that David?

All it needs is a pail in the middle and you have an emergency camode.

Was it necessary to wall paper it?

Seriously that tube is frightening. I thought the CRM151 was bad enough, even it's smaller sister the CRM152B but that monster is something else! Take care David. Regards, John.

petertheorgan 13th Dec 2018 9:16 pm

Re: Baird T5 retoration project.
 
so thats what's happened to the old coffee table radio from Warnham

FERNSEH 13th Dec 2018 9:39 pm

Re: Baird T5 retoration project.
 
Hi John and Peter,
The wallpaper covered plywood was removed from the inside of the green Decca 121 cabinet. That set was the subject of a topic in this forum last year.

DFWB.

Catkins 14th Dec 2018 5:24 am

Re: Baird T5 retoration project.
 
Quote:

Originally Posted by FERNSEH (Post 1100193)
Check out that fifteen inch diameter CRT. Isn't that one scary thing! Tube is 36 inches from base to screen.
Now I have to find some way of getting it out of the cabinet.

Is this an electromagnetically deflected and focused CRT, or electrostatic? It seems very long for an electromagnetic CRT? Just curious.

Phillip

beery 14th Dec 2018 10:03 am

Re: Baird T5 retoration project.
 
Hi Phillip,
it is indeed magnetically deflected and focused triode, yet has a 2" diameter neck!
The base is similar in size to the 12 pin Electrostatic base that was common at the time (as used on the VCR97 etc.) but with less pins. The base socket itself is shaped like a cup.

Cheers
Andy

Studio263 14th Dec 2018 12:19 pm

Re: Baird T5 retoration project.
 
Quote:

Originally Posted by FERNSEH (Post 1101297)
And here it is, the special cradle to be used to keep the CRT safe and secure while it is removed from the set.

If you bust that tube you'll be sick as a parrot...

beery 14th Dec 2018 2:11 pm

Re: Baird T5 retoration project.
 
Quote:

Originally Posted by Heatercathodeshort (Post 1101302)
What is that David?

Was it necessary to wall paper it?

I think you will find that this is the internal part of David's new cabinet for the T5. The original mirror lid will be salvaged and painted a lovely shade of pink. Then new sides will be made from trendy clear varnished OSB ;D

Cheers
Andy

FERNSEH 14th Dec 2018 5:17 pm

Re: Baird T5 restoration project.
 
1 Attachment(s)
Hi Andy,
I'm sure the owner of the T5 wouldn't be all that happy if his set finished up like that Decca 121 I bought from a charity shop in Newcastle last year.
I can report that all the green paint has been stripped off the cabinet surfaces.

The 15mm plywood for the cabinet floor and shelf can be bought from B & Q. It's the furniture grade walnut veneered 9mm plywood I'm still on the lookout for.

DFWB.

beery 15th Dec 2018 12:27 am

Re: Baird T5 restoration project.
 
2 Attachment(s)
I've found some pictures of the Bakelite cup tube socket. I looks a bit like a distributor cap...

Hi David,
A quick internet search on my phone shows quite a few suppliers offereing single side walnut veneered birch plywood. However on closer inspection, none of the first few that I clicked on actually had Walnut available from stock.
No doubt it will be a case of it being made to order and hence expensive. Still probably the best option though.
Is a standard 1.2 x 2.4m sheet large enough to make the two sides when cut in half?

Of course there is still my OSB suggestion, very "on trend".

Btw. A cabimet maker once informed me that double veneered playwood was the way to go to prevent warping. Is this still the required thing to do with modern plywood with its more stable bonding resins?

Now, going back to the top of my post here and on the subject of Phillip's (Catkins) earlier question... Was such a wide neck a major problem for the magetic field of the scanning? EMI seemed to think so with their narrowed (at the scan coils) necks on their early tubes. Were they wrong? Think how many OBEs* could have been saved if they had not started off down the narrow neck route...

*Order of the Broken Emitron

Cheers
Andy

FERNSEH 17th Dec 2018 11:28 pm

Re: Baird T5 restoration project.
 
Three 2400mm X 1200mm sheets (8 x 4) sheets of plywood have been ordered, delivery tomorrow.

The 9mm sheet is top quality grade A and is to be used in the construction of the front and side panels. The 12mm and 15mm sheets are BB grade for the construction of the cabinet floor and chassis shelf.

DFWB.

PJL 20th Dec 2018 10:33 pm

Re: Baird T5 restoration project.
 
This thread has gone deathly quiet just when we got to the climax of lifting the tube out and testing it!

FERNSEH 21st Dec 2018 1:59 am

Re: Baird T5 restoration project.
 
The tube remains in the cabinet until after the Christmas holiday.
In the meantime the plywood sheets have been cut up into more convenient to handle 1200 X 1200mm pieces. The vision and sound receivers will be connected to a power supply. There's a good chance that these units will be serviceable.

DFWB.

mark pirate 21st Dec 2018 5:38 pm

Re: Baird T5 restoration project.
 
Quote:

The tube remains in the cabinet until after the Christmas holiday.
Very wise David, a job best done when sober!
It does look quite a scary beast to handle, removing the 15" Mazda in my Ultra was nerve wracking enough, no doubt the tube in the Baird is a fair bit longer.
:beer:
Mark

FERNSEH 21st Dec 2018 6:09 pm

Re: Baird T5 restoration project.
 
Hi Mark,
It sure is a long tube being something like 34inches! In comparison the 15" Cossor CRT in my Baird T23 is "only" 27 inches long.

The Emiscope 6/6 is 28 inches long.

DFWB.


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