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Old 4th Sep 2018, 10:06 am   #21
Jac
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Thanks John.
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Old 4th Sep 2018, 1:36 pm   #22
beery
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Hi John,
It's great to see what one of these CRTs looks like when it is working.
I've always stayed away from metal cone CRTs for fear of being lumbered with dead sets, but you were super lucky to be offered a tube after so long.

Is this going to be the longest restoration you have done from start to finish?

Cheers
Andy
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Old 4th Sep 2018, 5:28 pm   #23
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Hello Andy,
Ha ha! I think it might be the shortest if you don't count the 25 years plus in between! I don't blame you staying away from MC chassis. They are usually 90% useless. All glass tubes can be fitted but that spoils the oddness of these chassis. Good luck with your Baird project. John.
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Old 5th Sep 2018, 12:13 am   #24
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

In the model 989T Ferguson took extraordinary care to ensure the interlace was perfect. V14A (ECL80) is the sync separator and works in the normal manner by conducting on the positive going sync tips. The negative going syncs at the anode are supplied via C53 and L27 direct to the line timebase.
The triode section V14B acts as a sync pulse inverter, the positive going frame sync pulses are integrated by C55 (150pF) and supplied to the grid of the triode connected EF80 V15. This valve operates as a sync clipper to remove the line sync pulses. The cathode of V15 is held to a steady potential by R67 and R68. The valve does not conduct on the lower amplitude line sync pulses and only the frame sync pulse is developed across the anode load resistor R69.

DFWB.
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Old 5th Sep 2018, 12:26 am   #25
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Quote:
Originally Posted by Jac View Post
Hi David and John,

Very interesting!
The "Radiant Screen" really does what it says!
It is the same with my little Perdio (thanks David!).
Can you see if the AW21-11 was made by Mullard/Philips?
Please find attached a photo of the gun assy.

Jac
Hello Jac

The label on the Mullard AW21-11 CRT in my Perdio Portorama. The tube is "British Made". Perhaps the codes might help to identify the factory that made it?

DFWB.
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Old 5th Sep 2018, 7:13 am   #26
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Hello David,

The label on mine gives similar information.
D could normally refer to Valvo (Hamburg), but in the Valvo data handbooks I have, I could only find an AW21-10 (no AW21-11). Dimensions are the same, except the AW21-10 is a tiny bit longer. Electrical data is a bit different.
Three horizontal lines above each other could refer to "Electronic Tubes Ltd. (Mullard supply)", which does not help further.
Or does "Electronic Tubes Ltd." ring any bells?

Jac
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Old 5th Sep 2018, 7:27 am   #27
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Electronic tubes I believe was the registered name for EMITRON but David can confirm this.
Serial number 00965. Low production run. I think Perdio were the only company to use this tube. Maybe the late MW41-1s were sourced from Emitron.

I will be attempting to get the push pull amplifier operating this weekend. John.
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Old 5th Sep 2018, 7:35 am   #28
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

When I was a schoolboy I used my bedroom as a workshop! I took a photo (attached) in 1959 and in it you can see a metal coned tube. I used to run that set with no cabinet as that is how it was given to me. I cannot remember the make of the chassis but it gave a nice picture.

John
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Old 5th Sep 2018, 10:35 am   #29
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Good morning Jac, Electronic Tubes Limited was also known as ETEL and was the maker of special valves and tubes for industry.
Link to the Cossor.co.uk website: http://cossor.co.uk.websitebuilder.p...hosting.co.uk/

We're informed that Cossor moved the valve making division to a wholly owned company called Electronic Tubes Ltd. (ETEL)
Perhaps because Cossor Ltd was acquired by Philips in 1958 certain special tubes were made by ETEL for Mullard Ltd. It's possible that the late production MW41-1 fitted in John's Ferguson 989T was also made by ETEL.

From the Cossor.co.uk website:
"Cossor disposed of it's Radio and TV buisiness to Philips in 1958 having already dispossed of its remaining interests in ETEL around 1956.
After the Philips take over all of the Cossor model numbers start CR or CT (T for Television) followed by 4 digits with an optional Letter after the number"
The gun assembly in the replacement MW41-1 has the appearance of one made by Cossor.


DFWB.
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Old 5th Sep 2018, 10:53 am   #30
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

HKS wrote:
"Electronic tubes I believe was the registered name for EMITRON but David can confirm this."

From Graces guide: https://www.gracesguide.co.uk/Electronic_Tubes

This confirms that ETEL and Emitron were the same firm.

Most Emitron valves were sourced from Mullard Ltd.

DFWB.
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Old 5th Sep 2018, 11:05 am   #31
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Thank you David for this information.

Are Cossor tubes usually good?
The AW21-11 in my Perdio is one of the brightest of any set I have in my collection!
My experience with Emitron tubes is limited, but not good.

The website you mention ( www.gracesguide.co.uk ) is very interesting David ! I had not come across this before.

Jac
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Old 5th Sep 2018, 12:53 pm   #32
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Jac wrote:
"Are Cossor tubes usually good?"
Hello Jac,
The tubes made by Cossor were good, even EMI used certain 10" tubes when that company was having a bad time with their Emiscope tubes. Later Cossor branded CRTs were supplied by Mullard.

Ferguson fitted the metal cone Mullard MW43-43 17" in one model made in 1953. I believe the MW43-43 was more widely used in Continental sets but the round faceplate 16" tube was only used in UK made sets.

DFWB.
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Old 5th Sep 2018, 1:57 pm   #33
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Thank you David.

Always interesting and useful to know a bit more about these companies.

Jac
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Old 5th Sep 2018, 9:37 pm   #34
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

This evening I thought it a good idea to tidy up the under chassis. I had tacked on a few caps to sort out the frame timebase and these had to be re stuffed to keep a 1951 appearance.

Three of the capacitors are waxies, two Hunts and one Dubiliar. The Hunts had the details stamped on the outside of the wax coating and of course this melted along with the wax. I used the cardboard tubes sealing the ends with wax from the originals.They look OK.

More luck with the Dubiliar. This had the markings on the cardboard tube itself and after re stuffing looked exactly like the original.

The hard 'composition'cased Hunts were replaced as a whole. The bright yellow high quality caps were toned down a bit with a quick spray of Burgundy car enamel. The yellow/orange cased electrolytics are original as are all other components including the resistors that are well within tolerance.

I have left a few of the original caps in the noise limiter circuits as they are around 5M and it would be a waste of good capacitors to replace these. The audio output stage is the last section to tackle. No real problem here, just the capacitor old timers no doubt causing high grid current. The output transformer reads OK so all looks well.

Storage is the word with these old receivers. It makes life so much easier if they have been stored in warm dry conditions. They rarely are.

Picture shows the finished under chassis view with the 'fake' capacitors.

The interlace is perfect over the entire locked range of the frame hold control. Fine sets these Ferguson.

Regards, John.
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Old 5th Sep 2018, 10:10 pm   #35
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

I think this is as good as it gets. Absolutely stunning 405 line pictures that sparkle. [Take a look at the end of the trumpet.] Pictures 1 & 4 were taken with the LED bench lamp illuminating the rear.

Just the picture position magnet to ease. I don't want to take it apart, I still have the horrors of taking my Dads hand drill chuck to bits and all the springs fell out. Well I was only 6! Just a drop of diesel over a day or two should soften the old grease. John.
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Old 5th Sep 2018, 10:17 pm   #36
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

A very nice result and the trumpet playing was a great part in the film.

Peter
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Old 5th Sep 2018, 11:56 pm   #37
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Those pictures look brilliant.
What is the green square component under the chassis bottom right?
It looks modern in the photo.
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Old 6th Sep 2018, 9:11 am   #38
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Nice bit of 1951 plastic. It is an insulating sleeve on the can of L1 and L2. This is the aerial coupling coil and the grid tuning coil. It is a bit tight around that area.

The pictures are good from just a bit of powder on the back of a sheet of glass and all in a vacuum. It really brings home the wonder of real television.

These are quite early days in the use of plastic and like Ekco, Ferguson made good use of it. John.
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Old 6th Sep 2018, 9:25 am   #39
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

An excellent result with a fantastic tube John.

At the time I'd missed the repair by David his 989T and this gave also a fine picture.

What a large picture for 1951! Must have been an eye catcher in the RTV shop.

Jac
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Old 6th Sep 2018, 9:49 am   #40
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Default Re: Ferguson 989T 16" console Metal Cone CRT. 1951.

Very interesting thread and a great result! I have never even seen pictures of one of these tubes, only read about them, and what I read didn’t make them sound very good either. I always thought it’d be pointless to get a set with such a tube as it’d be likely full of air.

Regards
Lloyd
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