Dating mullard valves

dating mullard valves

How many different types of Mullard valves are there?

As Mullard made 8600 different types of valve, I am not going to try and list all of the Engineering Codes but a poll of tInterweb should find a list somewhere The lower line is the date code and a handy decade split can be made from the number of characters this line possess: -

What is the date on a valve label?

An additional system of dating is also used which records the date of valve labelling, this dating system utilises a four digit numeric code in which the first two integers denote year and the second two integers the week of the year. Hence 6712 would denote March 1967.

What are the Brimar Valve type & date codes?

BRIMAR VALVE TYPE & DATE CODES - HOW TO INTERPRET THEM Mullard-Philips RETMA Military Pre 1960 code Post 1960 code 12BH7 12BH7 585 1585 6V6GT 6V6GT CV511 422 1422 6X5GT 6X5GT 432 1432 E83CC 12AX7WA CV4004, 6057 977 1977 17 more rows ...

Do you know the history of military valve markings?

I have just received an e-mail asking for details of military valve markings so heres a little primer for anyone who might have a similar interest. Valves used by the British military Armed Services were marked with a CV or common valve name which was defined by the Inter-Service Technical Valve Committee in 1941.

What is a Mullard valve?

The Mullard Radio Valve Co. Ltd. of Southfields, London, was founded in 1920 by Captain Stanley R. Mullard, who had previously designed thermionic valves for the Admiralty before becoming managing director of the Z Electric Lamp Co.

How many types of valves are there?

Types of Valves: 1 Gate Valve 2 Globe Valve 3 Check Valve 4 Plug Valve 5 Ball Valve 6 Butterfly Valve 7 Hydraulic Valves 8 Needle Valves 9 Pinch Valve 10 Disc Valve More ...

What did Mullard make in 1962?

In 1962 over 6,200 were employed and Mullard described the Blackburn works as the largest valve manufacturing plant in Europe. By 1949 Mullard had produced a number of television sets, such as the MTS-521 and MTS-684. In 1951 Mullard was producing the LSD series of photographic flash tubes.

What was the largest valve manufacturing plant in Europe?

In 1962 over 6,200 were employed and Mullard described the Blackburn works as the largest valve manufacturing plant in Europe. By 1949 Mullard had produced a number of television sets, such as the MTS-521 and MTS-684.

What do the markings on ball valves mean?

Here are 5 markings that may appear on ball valves as they identify testing and/or ensure quality. UL – Underwriter’s Laboratories tests valves to 3 times the pressure rating stated on the valve body.

Why do military vehicles have markings?

As long as there have been military vehicles – which admittedly are often identical to thousands of other such vehicles, there have been markings. The markings serve not only to identify a particular vehicle, but also to identify the unit and formation that it was serving in.

How do I find the manufacturing specification of a valve?

Often, below the CV number, a two part alpha code of the form KB/xx or JB/xx will be seen which gives the devices manufacturing specification and qualification . For the first part of the alpha code, the K designates a valve manufactured to specification K1001 or K1006; similarly a J designates a valve manufactured to a JAN or MIL spec.

What do the letters in the valve codes mean?

The second letter of the first part of the alpha code describes the qualification approval the valve type has, a B denotes qualification by a UK authority, a U denotes US qualification, a D denotes Australian qualification and an X denotes Director of Electronics Research and Development (DERAD) approval.

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