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Old 9th Jun 2008, 6:08 pm   #1
FERNSEH
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Default Cossor 900.

The Cossor 900 was introduced in 1946 and was ready for the restart of TV transmissions from AP.
For all intents and purposes the set is very similar to the pre-war model 1210.
There are some styling details to the cabinet and some minor electronic modifications, but that's all.
All the valves are old fashioned 5 and 7 pin types, no octal or all glass types are employed in this set.
The set was passed on to me by a Forum member, but it will be some time until I will do any restoration on the set, I've got other jobs to to.
The Cossor 900 and 1210 are huge sets, being almost 48 inches high. Also they have a large CRT, a fearsome looking 15" diameter 45 degree type which was made by Cossor.
So how do I remove this huge set from the van without damaging it or myself? The solution was to screw on a cabinet base which was removed from a scrap console TV set, the castors will permit easy movement of the set. However, some vibrations might damage things inside the set when the set was pushed about so an ingenious suspension system was fitted between the set and castors.

The set is now parked up in the workshop.

DFWB.
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Old 9th Jun 2008, 6:12 pm   #2
Ian B
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Default Re: Cossor 900.

An awesome set David. I await the restoration story with eager anticipation!

Ian Blackbourn
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Old 9th Jun 2008, 6:23 pm   #3
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Default Re: Cossor 900.

hello David.
I see you have borrowed the suspension system from the Mini, Sir Alex would be proud of you!
Trevor
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Old 9th Jun 2008, 6:32 pm   #4
FERNSEH
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Default Re: Cossor 900.

Quote:
Originally Posted by murphyv310 View Post
hello David.
I see you have borrowed the suspension system from the Mini, Sir Alex would be proud of you!
Trevor
Hi Trevor,
It's got excellent damping and shock absorption properties. I don't want any shocks getting though to that fragile CRT.

DFWB.
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Old 9th Jun 2008, 8:00 pm   #5
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Post Re: Cossor 900.

There was a leaflet for this set on Ebay!
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Old 9th Jun 2008, 8:14 pm   #6
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Default Re: Cossor 900.

Thats a fine receiver David. It looks a lot later than its early pedigree. A number of these receivers survived into the colour receiver era. The 15" picture is quite large enough for most living rooms and is very pleasing to view and I think that is what guaranteed their survival. They were very reliable and of the two that I serviced in my early days, both had their original EHT transformers.
A large number of better off people had decided to buy television receivers just before the war. 1940 was to be a big 'launch' for television but alas a man with a funny walk put paid to that. In 1946 they had their chance and the Cossor 900 sold in quite large numbers.
I hope you don a brass deep sea diving suit when you remove the radio unit and don't sneeze........Regards, John.
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Old 10th Jun 2008, 8:52 am   #7
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Default Re: Cossor 900.

I wonder if the casters from the trolly would screw inside of the legs/plinth . I have no idea why some manufacturers didnt fit them to the earlier heavy sets !?
My Tug 12 and TV1 didnt have any . the tv1 had some fitted after sale , probably early on but they fitted them on the feet ,so the thing looked daft ..I re fitted them behind the feet and the are just long enough to make it movable but short enough to look like its on the feet . I will fit some to the tug when i do the cabinet up.
might be worthdoing. other wise you just cant move the thing
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Old 10th Jun 2008, 11:50 am   #8
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Default Re: Cossor 900.

The picture shows the CRT. A similar CRT was fitted into the English Electric model 1550. A certain pre-war Baird TV set, the T23 employed this Cossor made tube although it might have been a post-war replacement.

The Cossor 1210 and 900 were superhets and the signal circuits resemble those of the 6" CRT model 54. Special valves were made by Cossor for these sets. One noteworthy valve is the sync separator which is a 4TSA. It is described as a split anode valve but in fact it is a double pentode.

DFWB.
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Old 10th Jun 2008, 1:09 pm   #9
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Default Re: Cossor 900.

Weren't Cossor a superb firm.............................................. ...ianj
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Old 10th Jun 2008, 1:12 pm   #10
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Default Re: Cossor 900.

And to think I worry about transporting 42" plasma sets!
Good luck to a brave man....
Glyn
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Old 10th Jun 2008, 6:37 pm   #11
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Default Re: Cossor 900.

Quote:
Originally Posted by ianj View Post
Weren't Cossor a superb firm.............................................. ...ianj
Yes Ian they certainly were and produced television receivers from the very start. Surprisingly they are not popular with collectors, odd because they produced almost everything 'in house' with complete success, an endevour that EMI never managed to match to the same reliability. Regards, John.
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Old 12th Jun 2008, 12:39 am   #12
mark pirate
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Default Re: Cossor 900.

I look forward to seeing this set restored
Rather you than me removing that tube though
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Old 13th Jun 2008, 10:57 pm   #13
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Default Re: Cossor 900.

Quote:
Originally Posted by mark pirate View Post
Rather you than me removing that tube though
I have not yet summoned up the courage to remove the CRT and the chassis.

I've connected the set to a variac which has been set to 60 volts. At once the SU2150 EHT rectifier glowed bright purple. A replacement has been fitted and now there is 900 volts at the anode of the valve. I believe the EHT transformers were very reliable in these receivers.

DFWB.
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Old 14th Jun 2008, 12:19 am   #14
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Default Re: Cossor 900.

From this I assume the EHT will be around 4KV when the set is running?
Or will the heater voltage as a result of running via the variac be a factor in this?

Good luck with the restoration, looking forward to seeing the first pictures when you have the set working ..


If only modern equipment was made with such skill and craftmanship!



BG
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Old 6th Jul 2008, 5:26 pm   #15
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Default Re: Cossor 900.

HI david,

is it a radio on the top ,do you have better picture to this set ?

Good luck for restoration ,waitting for a tropic about télé industrie

I've send you a mail

kind regards

wilfrid
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Old 7th Jul 2008, 4:59 pm   #16
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Default Re: Cossor 900.

Hi Wilfrid,
Here is a picture of the radio receiver which is fitted on top of the Cossor 900 cabinet.

With regard to the Radio Industrie TV. This 819 line set which has a 14" round CRT will appear as a new topic on this forum.

DFWB.
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Old 8th Jul 2008, 8:34 am   #17
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Default Re: Cossor 900.

hi david,

Thak you for this picture ,it's curious to make radio on the top without protection not easy for the dust.

Do you receive my private mail about english electric.

wilfrid
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