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

FERNSEH 3rd Jan 2019 9:30 pm

Re: Baird T5 restoration project.
 
2 Attachment(s)
Restoration work has restarted. The new shelf for the receiver and timebase chassis assemblies is presently being made. 15mm plywood is the material used to make this part. The panel is marked out for various holes and the centre section which will be cut out for the CRT neck components.

Meanwhile the CRT remains in the cabinet.

DFWB.

FERNSEH 7th Jan 2019 1:04 am

Re: Baird T5 restoration project.
 
2 Attachment(s)
The new cabinet shelf and the old one for comparison.

DFWB

Heatercathodeshort 7th Jan 2019 11:26 am

Re: Baird T5 restoration project.
 
Do you want to borrow my leather bomb disposal outfit before you remove that tube David? It takes 3 hours to get into it..

Nice start on that rotten cabinet. Once the tube is reinstalled it will be great fun to get the 'works' working. John.

FERNSEH 8th Jan 2019 9:34 pm

Re: Baird T5 restoration project.
 
4 Attachment(s)
NEWS FLASH!
This evening the CRT was removed from the cabinet. A real scary job.

The tube now rests on the special receptacle that was made for this restoration project.
The CRT has a thick neck, 45.5mm, much thicker than the Cossor tube installed in my Baird T23.

Now the dismantling of the cabinet can begin.

DFWB.

Panrock 8th Jan 2019 9:43 pm

Re: Baird T5 restoration project.
 
Relief! Well done David. I speak as someone who has been through the same experience.

How did you do it in a little more detail?

Steve

FERNSEH 8th Jan 2019 10:45 pm

Re: Baird T5 restoration project.
 
Hi Steve,
Well, it was a sort of an anti-climax. Apart from dressing up like the Michelin Man wearing googles and a face visor the tube was simply lifted out and placed on the special stand. That was a good idea of Andy's to suggest I should make it to facilitate easy removal of the tube. It is a big tube but it doesn't weight very much being made with very thin glass.

The EHT transformer in my HMV 901 has failed so that's another tube out job before access to the power supply unit is possible.
And to think we thought the Emiscope 6/6 tube was a scary thing.

From the ETF: http://www.earlytelevision.org/german_crt.html

DFWB.

peter_scott 9th Jan 2019 12:46 pm

Re: Baird T5 restoration project.
 
Quote:

And to think we thought the Emiscope 6/6 tube was a scary thing.
Is the Cathovisor made of Pyrex?

I think the 6/6 being Pyrex is probably a bit safer.

Peter

FERNSEH 9th Jan 2019 1:44 pm

Re: Baird T5 restoration project.
 
Hi Peter,
At this stage of the restoration I haven't examined the tube to determine if it was made with soft glass or Pyrex.
Agreed, I always believed that the Pyrex tubes were safer, but who knows?

The cabinet is coming apart nicely. Today I will make a new cabinet floor, very easy part to replicate.

DFWB.

peter_scott 9th Jan 2019 2:08 pm

Re: Baird T5 restoration project.
 
I've just done a Google search and found a Bonhams sale description for a 15 MW2. Scary yes, but could be worse.

Peter

"CATHOVISOR CATHODE RAY TUBE, BAIRD TELEVISION LTD.\nC.1936, Hysil (Pyrex glass), type 15 MW2, serial No. A2666, pre-mask screen diameter 14". With the early roundel strip contact boss in black Bakelite, with gilt capital company transfer BAIRD reading across, exposed glass area at neck for heater element view, neck funnel with internal anodised beam coating, etched to cone section with serial and type details with BRITISH MADE below, good phosphorous coated screen field with no ion burn trace in disconnected status."

beery 9th Jan 2019 3:07 pm

Re: Baird T5 restoration project.
 
Hi David,
I'm glad it came out without any trouble. I must admit, I was a bit worried about what would happen...


Cheers
Andy

FERNSEH 9th Jan 2019 4:20 pm

Re: Baird T5 restoration project.
 
3 Attachment(s)
Latest pictures of the cabinet restoration.
This after noon I'll make the new cabinet floor.

DFWB.

FERNSEH 10th Jan 2019 9:37 pm

Re: Baird T5 restoration project.
 
1 Attachment(s)
Todays job. Test fit the new cabinet floor.

DFWB.

FERNSEH 12th Jan 2019 9:18 pm

Re: Baird T5 restoration project.
 
1 Attachment(s)
The replacement focus coil support. Two attempts to get this one right. Problems cutting out the 4" diameter hole.

DFWB.

FERNSEH 16th Jan 2019 9:33 pm

Re: Baird T5 restoration project.
 
3 Attachment(s)
Today the construction of the new CRT support board was completed.
The frame oscillator transformer test fitted. As the panel appeared to be in better condition when compared with most of the other wooden parts in this set I did consider restoring it, but abandoned that idea when it started to disintegrate.

The third picture shows all the new parts made so far and the serviceable items including the CRT.

Coming up next: the loudspeaker baffle.

DFWB.

Panrock 17th Jan 2019 8:16 pm

Re: Baird T5 restoration project.
 
Brilliant work, David. It must be satisfying for you to see how it is coming together.

Steve

FERNSEH 17th Jan 2019 9:15 pm

Re: Baird T5 restoration project.
 
1 Attachment(s)
Hi Steve,
I'm really enjoying this restoration project and it's progressing very well. Today the loudspeaker baffle was removed. As the attached picture shows it's in a terrible state. A replacement baffle is being made. It should be finished tomorrow.

DFWB.

FERNSEH 18th Jan 2019 9:25 pm

Re: Baird T5 restoration project.
 
1 Attachment(s)
The new loudspeaker baffle.

DFWB.

Jac 18th Jan 2019 9:31 pm

Re: Baird T5 restoration project.
 
Making good progress David.

It will be really interesting when you get to the parts on the outside of the cabinet!
I'm looking forward to seeing your solutions for those very difficult parts.
I'll certainly learn a lot!

Jac

FERNSEH 18th Jan 2019 10:43 pm

Re: Baird T5 restoration project.
 
2 Attachment(s)
Good evening Jac,
The cabinet side panels should be easy to replicate. The front of the cabinet consists of three parts. The upper panel has the user controls, the middle section has the loudspeaker aperture and the much larger lower section has the door which conceals the pre-set controls.
The middle section has already been removed for inspection and like all the other plywood panels it is useless, completely rotten. So this is the next part to be replicated. 12mm plywood will be used to replace the original 1/2" thick plywood panel.

DFWB.

FERNSEH 20th Jan 2019 9:41 pm

Re: Baird T5 restoration project.
 
1 Attachment(s)
Testing the sound receiver. Using a borrowed power supplier set to provide 250 volts HT and 4 volts for the valve heaters. The audio amplifier consists of a Mullard 354V triode and a Mullard PENA4 output valve. That part of the circuit is working OK and there is some activity when the top caps of the FC4 detector and TSP4 IF amplifier are touched. All the B & I make capacitors are leaky and will have to be restuffed.

The loudspeaker is of the energised type.

DFWB.


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