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The Early Mullard Naming Convention

    
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The Type No. AC044 merits comment because it is so frequently quoted as ACO44, even in some later official Mullard publications.

According to the nomenclature used by Mullard when the AC044 was introduced:

AC---

Directly-heated filament designed for AC operation

--04-

The nominal mu value ie. 4

----4

Indicates the filament voltage ie. 4


Further examples

AC042

Same as AC044 but with 2-Volt filament

AC064

Similar to original AC044 but with mu = 6

AC084

Similar but 400-Volt anode rating and mu = 8

AC104

Similar to original AC044 but mu = 10

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