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Mullard valves
Mullard valves
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Old 11th October 2018, 04:44 PM   #11
Alan4411 is offline Alan4411  Wales
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Llan,
Yours is a Canadian Philips valve.
4X5 is an ECF82/6U8. Little r is from the Ontario Philips plant. Probably made in June 1955 (or 1965?)

See the table I posted in post #5 and confirm it for yourself.

You find a lot of Canadian 6U8 / ECF82s under various brands, but most are marked Made in Canada.
Alan
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Old 11th October 2018, 04:51 PM   #12
llan is offline llan  England
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Default Mullard codes

Thanks for that info Alan, very informative.


Llan
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Old 12th October 2018, 09:15 AM   #13
DF96 is offline DF96  England
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A number between the pins probably means not Philips manufacture, so you seem to have one Canadian Philips and one made somewhere else.
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Old 13th October 2018, 09:47 AM   #14
v4lve lover is offline v4lve lover  Netherlands
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Mullard valves
or they can be old, the old rimlocks had numbers between the pins, or the number of the base making machine stamped into the bottom.
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Old 13th October 2018, 04:44 PM   #15
llan is offline llan  England
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Default Mullard codes

Well I managed to figure out what an imported Mullard EF86 coded BY3 plus D9J4 it was made in Hamburg, but I can not quite make out what KBA for a CV181 is and like wise a KB/Z for a CV1438 any ideas lads


Llan
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Old 13th October 2018, 06:37 PM   #16
Alan4411 is offline Alan4411  Wales
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Quote:
Originally Posted by llan View Post
Well I managed to figure out what an imported Mullard EF86 coded BY3 plus D9J4 it was made in Hamburg, but I can not quite make out what KBA for a CV181 is and like wise a KB/Z for a CV1438 any ideas lads


Llan
Ummm, well Philips codes only become unified around 1948 as it says in the introduction. These are older types and most likely pre-date 1948 when there was no rational to the coding.

But, you are quoting the CV (Common Valve) codes and these start during the Second World War. KB is a specification the A or Z are manufacturer codes (usually - not always.) Look here please. CV NUMBERS AND UK MILITARY DATE AND FACTORY CODES – MULLARD MAGIC
and here
CV valves

So the CV181 KBA is a Blackburn (Mullard) valve and the CV1438 is an Hammersmith (Osram).

Not straight forward is it!
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Old 14th October 2018, 02:53 PM   #17
llan is offline llan  England
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Default Mullard codes

Thanks for that info Alan


Llan
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