THE GREAT MULLARD MAGIC BLOG — brimar inked codes

Well, we did Mullard last week so this time, lets look at the Brimar type and date codes, oft seen on valve envelopes in minuscule inked print, but what do they mean? Brimar codes come in two parts separated by a forward slash "/". The first part, of format number-letter-number is the date code where the first number signifies production week of month, the following letter signifies the production month and the second number signifies the production year. First number: - 1 = week 1 of production month 2 = week 2 of production month 3 = week 3 of production month 4 = week 4 of production...