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Not quite true ....

In mid 1965, Siemens moved to stamping the three-lined code on an aluminium clad that was attached to the top mica support within the tube's glass envelope. This was only done for a period of 6 months or so before the appearance of the 2-lined A1 6-letter code.


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  • Not quite true .... - XLR8OR 04:52:13 07/05/12 (0)

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