English Electric TV sets

[slidertogrid]

I have never seen a metal cone CRT, they were all well before my time, only the adverts in Practical Television. This thread is very interesting, can I ask some (may be stupid) questions? How was the neck attached and sealed to the cone ? and surely the scancoils were not fitted over the cone as it would screen the deflection and the EHT would arc to the coils? The cone must have been fairly strong not to be distorted by the atmospheric pressure? It seems a very complex design potentially creating problems during manufacture I wonder why they pursued this design when others were making all glass tubes?
Rich

[high_vacuum_house]

This is a very interesting article,
Attaching or bonding the screen glass to the metal cone must have been interesting. I wonder if they used the Housekeeper joint technique as in the big CAT transmitter valves. Where would the getter go as the cone would stop the RF heater radiation reaching it. I can’t imagine seeing the implosion of one, must have crumpled up like an old beer can!!
I wonder whether EE designed the tube all by itself or wether it was licensed to make it from an American manufacturer as they were a bit more common over there I believe.

Christopher Capener

[FERNSEH]

The English Electric metal-cone CRT type T900 employed in the TV model 1650 was a narrow deflection angle tube designed to replace the all-glass 15" Cossor 85K CRT.

The CRT type T901A in the EE model 16T11D is electrically identical to the Mullard MW41-1.

DFWB.

[Peter.N.]

Cant remember how the scan coils were mounted, never had occasion to interact with them but I would suspect the polythene cover of the flare was underneath them. I don't know if the Cossor CRT referred to was the one used in the pre war set but the metal one was only about half the length.

Peter

[FERNSEH]

Hi Peter,
The Cossor CRT in the EE model 1550 was the same type used in the pre-war Cossor 1210 and post-war model 900. The 16" English Electric T900 metal cone CRT was about the same length as the Cossor tube.

DFWB.

[Mikey405]

Hi Peter.

The metal-cone tubes had the usual cylindrical neck plus a few inches of a glass cone, which was then attached using some magic (as far as I'm concerned, anyway) to the metal cone, so the scan coils didn't need to be specially insulated on the tube at all.

[EF80TVVALVE]

Just to highlight one of my previous posts on here - does anybody recall or know what happened to the EE 1550 minus CRT which was at the NVCF several years ago? I can't remember exactly which year it was, but it may have been around 2010. I'd be interested to know if it still survives although considering it's condition I have doubts that it does.

[FERNSEH]

Originally Posted by Mikey405

Hi Peter.

The metal-cone tubes had the usual cylindrical neck plus a few inches of a glass cone, which was then attached using some magic (as far as I'm concerned, anyway) to the metal cone, so the scan coils didn't need to be specially insulated on the tube at all.

From Wikipedia: Metal to glass seal. https://en.wikipedia.org/wiki/Glass-to-metal_seal

DFWB.

[Mikey405]

Originally Posted by FERNSEH

From Wikipedia: Metal to glass seal. https://en.wikipedia.org/wiki/Glass-to-metal_seal

DFWB.

No, no, no. It's magic, David. I refuse to believe otherwise.

[Heatercathodeshort]

I think the glass to metal seal was just that. later 'FRIT' was used to literally glue the all glass colour TV tubes together and I can never remember an air leak.

I agree, back in time EE left rows of tubes on the benches overnight and at 1am in the morning the seal pixies led by a big fat garden gnome would carry out the process when no prying eyes would see the secret process. It is mentioned in the W.W. and I think it was called PIXINOME'

I have a T900 in the loft but it's too cold to venture. I'll see what I can do. John.

[Mikey405]

I'm hoping the T900 in my 1550 is okay, John. The getter looks perfect so I'm feeling confident.

[Heatercathodeshort]

Hello Mickey.
You are more than welcome to my T900. I will never use it but it will need to be tested. It's in a box but like so many tubes the duff one was put in the new box. It's very clean and I can test it on Bertha. When you start restoration I will dig it out and test it. If yours Has a good getter it is probably, remarkably OK! Regards, John.

[theredhouseinn]

In answer to Stevehertz question on the plastic GEC tv's. I remember back in the late 50's and early 60's when I was doing my C&G 5 year apprenticeship course, I remember 2 bakerlight 14" tv's, the BT1154 and then the BT1155. I think from memory the BT1154 was a metal wired chassis set and the BT1155 had pcb. construction. Then came the wooden cabinet BT 302/4/6/8 17" sets.
John.

[Mikey405]

Originally Posted by Heatercathodeshort

Hello Mickey.
You are more than welcome to my T900. I will never use it but it will need to be tested. It's in a box but like so many tubes the duff one was put in the new box. It's very clean and I can test it on Bertha. When you start restoration I will dig it out and test it. If yours Has a good getter it is probably, remarkably OK! Regards, John.

Thanks John. I'm really hoping mine is a good one though. I think you get what you expect to get, so in my mind it has 100% emission.

[FERNSEH]

English Electric and HMV employed 21" metal cone CRTs in their sets, models C45 and HMV 1820, but 24" and 30" CRTs were also made.
http://www.earlytelevision.org/crosley_eu-30comu.html.

Not forgetting the special Murphy 24" TV which used a metal cone tube made by GE of America.
https://www.vintage-radio.net/forum/...d.php?p=737907

DFWB.

[Mikey405]

I love that 30" behemoth, David. Shame we didn't have something kind that in the UK.

[Heatercathodeshort]

Just in case you ever have to do a 21" conversion...What a job! I bet very few were carried out. The cost would have been at least £30 including labour. John.

[FERNSEH]

Originally Posted by Mikey405

I love that 30" behemoth, David. Shame we didn't have something kind that in the UK.

Hi Mike,
Imagine watching 405 line pictures on that big screen? Interlace would have to been perfect.

DFWB.

[Mikey405]

Originally Posted by FERNSEH

Hi Mike,
Imagine watching 405 line pictures on that big screen? Interlace would have to been perfect.

DFWB.

It's the sort of set that White Ibbotson might have made. The interlace on their projection sets was always astonishingly good.

[Mikey405]

Oh dear. I suppose it was a bit too much to expect...