Cossor 45IU

ID: 540327
? Cossor 45IU 
01.Jun.20 03:00
12

Ken Shellberg (USA)
Articles: 21
Count of Thanks: 5

I don't think this is a very rare tube. It turns up on eBay fairly often and I wonder why it isn't in RMorg?

It is the 4-volt version of the Cossor 53KU, which is in RMorg.

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 2
Cossor 45IU 
01.Jun.20 08:40
12 from 1294

Jacob Roschy (D)
Moderator
Articles: 1766
Count of Thanks: 4
Jacob Roschy

Hello,

the page for the Cossor 45IU is now created, I hope, the comparison with the 53KU is correct.
Aside the heater voltage the base is different as well.

Best Regards,
Jacob

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 3
Cossor 45IU 
01.Jun.20 14:55
42 from 1294

Ken Shellberg (USA)
Articles: 21
Count of Thanks: 3

I have both and the visible construction is identical. I should note that the skinny versions of the 53KU that some have posted are actually Mullard GZ37. Cossor ceased the production of vacuum tubes in the mid-1950's, but still made radios, so they simply sourced the GZ37 from Mullard and relabeled them.

And yes, the 53KU has an octal base and the 45IU has the European B-4 base, as one might expect for a British 4-volt rectiier.

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 4
Cossor 45IU 
01.Jun.20 21:13
82 from 1294

Ken Shellberg (USA)
Articles: 21
Count of Thanks: 3

Hello Jacob,

> the page for the Cossor 45IU is now created

I don't see a page for the 45iU that allows me to upload a picture? But I am very new here....

And unfortunately, I have not been able to find a data sheet for the 45KU. The British Valve Museum has some data on their site. And according to the document below (I have no idea where I found it or where it came from), the 45IU is equivalent to the MOV U18. This is all I can find...

 

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 5
Cossor 45IU 
01.Jun.20 21:52
88 from 1294

Jacob Roschy (D)
Moderator
Articles: 1766
Count of Thanks: 3
Jacob Roschy

Hello Ken,

the page for the Cossor 45IU is still there.

The document on your photo shows a page out of the Tube (or Valve ?) Vademecum.

Jacob

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 6
Cossor 45IU 
01.Jun.20 22:06
90 from 1294

Ken Shellberg (USA)
Articles: 21
Count of Thanks: 3

Hello Jacob,

Thank you for pointing me the 45IU page. When I use the search function on the home page, this page doesn't show up. Again, I'm very new here, so perhaps there is a better way to search?

Thanks again,

Ken

 

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 7
Cossor 45IU 
01.Jun.20 22:34
98 from 1294

Jacob Roschy (D)
Moderator
Articles: 1766
Count of Thanks: 2
Jacob Roschy

 

Ken,

to search a tube type, (1) first click on the tab “Tubes + Tr”, (2) then type in your desired tube,
(3) probably you can chose a search condition.

Jacob

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 8
Cossor 45IU 
01.Jun.20 22:36
98 from 1294

Ken Shellberg (USA)
Articles: 21
Count of Thanks: 3