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Old 27th Nov 2022, 4:32 pm   #21
Vintage Engr
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Default Re: English Electric TV sets

The English Electric TV's That I remember working on were mainly console models, with a mains transformer for EHT in the bottom of the cabinet.

Very dodgy to work on, but as an apprentice I was rather thrown in at the deep end!
I think the aerial feed was either balanced, or had something rather crude like a choc-bloc connector.
I'm pretty sure that these had a metal cone CRT.

David.
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Old 27th Nov 2022, 5:06 pm   #22
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Default Re: English Electric TV sets

Quote:
Originally Posted by EF80TVVALVE View Post
Nice to see a picture of the 16T11D working away Mike, the picture looks much better than when we last chatted about it. I'd love to come and see it working sometime in the future if possible, I'm still very sentimental about that set though I'm glad it's in a good hoem and being cared for.
Yes, of course, Bren. Although the set is currently down in Devon.
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Old 27th Nov 2022, 5:28 pm   #23
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Default Re: English Electric TV sets

I had a 16T11D given to me, by my soon to be Boss, when I started as an apprentice.

It was just the chassis and had been fitted with a stand alone Pye 13 Channel Tuner unit in a brown plastic box. From what I can remember it would have been modified around the time when ITV started up and it wasn't really saleable being essentially a Band one only set so it hung around for a few years gathering dust before it was given to me.

I played around with it my tiny garden shed but the smell was awful from the Corona in the damp weather. It did however look quite pretty in the dark. Some time later I noticed that both the EY51s on the LOPT had red hot Anodes and wrote to Practical Television mag for advice...

I'm pretty sure if someone digs down far enough in the garden where I used to live in Didcot they'll find it!

Denis
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Old 27th Nov 2022, 6:51 pm   #24
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Default Re: English Electric TV sets

Looking at Mikeys picture, would the metal section of the CRT been at 16Kv? so the only insulation was the plastic sheet? I don't think they would get away with that today!!
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Old 27th Nov 2022, 8:33 pm   #25
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Default Re: English Electric TV sets

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Originally Posted by Mikey405 View Post
Yes, of course, Bren. Although the set is currently down in Devon.
Thanks Mike, well if I ever plan on heading further down south sometime I'll let you know, likewise if the set finds its way back with you in Solihull then just let me know. It'll be a real joy to see it again and the work you've done.

Samjmann, yes the whole metal cone is at 16kV, the sheeting isn't great really but I suppose they thought engineers would know not to touch anything around there. I'm sure the earlier T900 as used in the 1501 didn't even have a plastic cover, from photos I've seen the metal cone is exposed and (in the case of the 1501) the front and top section is made of one piece of metal.
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Old 27th Nov 2022, 8:56 pm   #26
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Default Re: English Electric TV sets

Here's a picture of my English Electric 1550. It was bought sometime in the late 90s simply for the CRT. Needed the Cossor tube for the Baird T23. However, I was fortunate to find three Cossor 85K tubes, so the EE got a reprieve.
Now, I believe the set deserves something better than being a donor of its tube for another set. It is quite unique and a very well designed receiver.
I'll drag it out tomorrow for more pictures.

DFWB.
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Old 28th Nov 2022, 10:37 am   #27
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Default Re: English Electric TV sets

The 1550 and 1650 series used a separate EHT generator employing a beefed up 185BT, the 185BTA with extra insulation to prevent flashover. The EHT rectifier is a SU25, a rather large octal valve looking a bit outdated for 1950. John.
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Old 28th Nov 2022, 10:49 am   #28
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Default Re: English Electric TV sets

Quote:
Originally Posted by Maarten View Post
Philips had some metal cone tubes in the early days as well. Soon replaced with all glass types.
Yes, the 17" MW43-43 rectangular metal cone was used quite a lot in France and maybe other parts of Europe.
It only appears to have been was used in the UK in very early production of two models, the Ferguson 996T and the Ferranti 17T4.
Modification kits were supplied to replace these MC tubes with all glass tubes
typically the MW43-64/69 or in the case of the 21" T909, the massive MW53-20. John.
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Old 28th Nov 2022, 11:09 am   #29
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Default Re: English Electric TV sets

I have just found an Emitron valve/crt list which shows 185BT,185BTA and SU25. These
are all obviously made by Cossor. No metal crts in this 1954 list.
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Old 29th Nov 2022, 1:00 pm   #30
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Default Re: English Electric TV sets

185BT that was the one. The ones I serviced had a metal top section which must have been well earthed due to it's proximity to to the 'live' CRT.

Peter
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Old 29th Nov 2022, 1:53 pm   #31
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Default Re: English Electric TV sets

Later 185BTA and 185BTA valves were made by Mullard.
I'm sure this valve had industrial and military applications.
Attachment shows a Cossor 185BT which was made by Mullard.

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Old 29th Nov 2022, 3:08 pm   #32
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Default Re: English Electric TV sets

An odd heater voltage and current 18V at .45amp. More like a transmitting valve. No wonder the receivers were expensive with five of them in one chassis! J.
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Old 29th Nov 2022, 3:47 pm   #33
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Default Re: English Electric TV sets

The English Electric service manual is one of the very best I have seen. Gloss paper and many photographs. Just a basic few of the 1650 series. There does not appear to be the plastic bag over the cone on this model
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Old 29th Nov 2022, 3:52 pm   #34
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Default Re: English Electric TV sets

No bag! J.
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Old 29th Nov 2022, 7:00 pm   #35
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Default Re: English Electric TV sets

I have an advert for some I found at work in a local newspaper. £27 then is now £673!
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Old 29th Nov 2022, 9:37 pm   #36
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Default Re: English Electric TV sets

As a follow up to the popular 16" model 16T11D, in 1953 English Electric introduced the fringe area model 16T11F.
No experience of this model but I'm sure it must have been a superb receiver.
Five channel superhet with two RF amplifier stages, a self-oscillating mixer followed by two common sound and vision IF amplifier stages. Single stage vision and sound IF amplifiers. EF80 pentodes employed in the RF and IF amplifiers. No strange valves in this receiver.
Flywheel line sync employing two ECC81 double-triodes. One ECC81 functions as a coincidence detector and the other as a cathode follower control valve for the blocking line oscillator.
Flywheel line sync was an option in the models 1550 and 1650. Took the form of a plug-in unit which used two 6SN7GT double-triodes.
Here's another unusual Cossor valve, the 142BT:
http://www.r-type.org/exhib/aag0074.html

DFWB.
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Old 30th Nov 2022, 10:36 am   #37
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Default Re: English Electric TV sets

I believe EE offered a CRT reconditioning service for their metal cone tubes. It must have been a very expensive procedure when it came to man hours and delivery/collection. No wonder they threw the towel in by late 1955.
The pictures show the massive T909 21" MC tube mounted on the chassis. I think they had trouble with the 'Hoola Hoop plastic ring insulating the outer glass rim from the cone. If everything was not lined up the customer may have received a tingle from the edge of the mask or corona problems arcing to the cabinet on damp days such as we have now.

Pictures show the chassis and the line up for the T40 series, I believe the last model they produced. I doubt if they made any money from TV production and were glad to see the end of it. They had better, much more profitable projects to do.
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Old 30th Nov 2022, 10:44 am   #38
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Default Re: English Electric TV sets

Quote:
Originally Posted by Restoration73 View Post
I have just found an Emitron valve/crt list which shows 185BT,185BTA and SU25. These
are all obviously made by Cossor. No metal crts in this 1954 list.
Cossor appears to have supplied valves and their 12" tube 108K to short lived television manufacturers such as Etronic.
I'm almost sure the MC tubes were made by EE. John.
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Old 30th Nov 2022, 1:18 pm   #39
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Default Re: English Electric TV sets

Cossor 108K tube is of course a 10" tube not a 12"..John.
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Old 30th Nov 2022, 4:17 pm   #40
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Default Re: English Electric TV sets

Quote:
Originally Posted by Heatercathodeshort View Post
I think they had trouble with the 'Hoola Hoop plastic ring insulating the outer glass rim from the cone. If everything was not lined up the customer may have received a tingle from the edge of the mask or corona problems arcing to the cabinet on damp days such as we have now.
They sound decidedly dodgy to me! I heard some stories about the metal cone tubes. Fortunately they were way before my time in the trade. I know they had a plastic insulating 'bag' over the cone that used to become fragile or possibly wasn't fitted properly during service that exposed the metal cone causing arcing problems. I'm glad I missed those......
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