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Mullard made ECC83 / 12AX7 and are becoming nearly impossible to find. Some tubes may be marked with the Mullard logo, by the British military as CV492 or come marked as Amperex in Amperex boxes.

These all bear the Blackburn Works, UK Mullard factory codes and are the real deal.

The following description is applicable to Mullard and Philips vacuum tubes, it may also apply to other manufacturers but only by coincidence.

Generally (and I can't express that enough) a Mullard or Philips vacuum tube will be marked near the base with a 2 row code, the first row is the manufacturers type code and the second row is a country/date code.

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The Mullard tubes in my Heathkit WA-P2 preamplifier were made in Great Britain, types 12AX7 (ECC83) and 12AU7 (ECC82). If you post them here (I can't really make them out), I will be able to decipher the coding.

I'm just curious whether these might the original tubes.The 12AX7 is basically two of the triodes from a 6AV6 - a double diode triode.The 6AV6 is a miniature repackaging (with just a single cathode) of the triode and twin diodes from the octal 6SQ7 (a double-diode triode used in AM radios), which itself is very similar to the older type 75 triode-diode dating from 1930.I have not been able to find the answer to this with a search. To a lesser extent the diameters of cathode and grid affect the equations involved.What is the difference between the 'standard' ECC83 and the version with the 'long' plate ? I've got a few dozen different ones and the plates have all sorts of variation in length. However, some new production ECC81/82 have totally different looking plates, resembling ECC88. Length of plate doesnt really enter into it, except perhaps to increase heat dissipation.The 12AX7 is a high-gain (typical amplification factor 100), low plate current triode best suited for low-level audio voltage amplification.In this role it is widely used for the preamplifier (input and mid-level) stages of audio amplifiers.What can really affect how a tube sounds compared to others of the same type is the purity of materials used in critical areas, mainly the cathode.Care in the precision of manufacture is also important.in Camden, New Jersey, under developmental number A-4522.It was released for public sale under the 12AX7 identifier on September 15, 1947. I've got a few dozen different ones and the plates have all sorts of variation in length. However, some new production ECC81/82 have totally different looking plates, resembling ECC88. The main factors are cathode material and temperature which determine the total emmission, and the ratio of grid to cathode distance vs plate to cathode distance ( or is it plate to grid ? Then the shape, ie cylindrical vs rectangular vs parallel plate. As such there are more than one means to an end - short plate, long plate, med plate -- and the other changes as required to make each work similarly.Are there many variations in plate length and what are they ? Also I suppose the longer the plate is, other things being equal, the less fringe effects come into play, and the closer the real tube should be to the text book equations.Are there variations in plate dimensions in other ECCxx tubes ? The shape of the getter only tells you when the tube was manufactured or more precisely which production run.




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