Philips Canada 12AX7 Code Question

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I have some Canadian Philips 12AX7 (r code) Feb 1964 with small halo getter and August 1964 with large halo getter. Both are I65 construction. Any idea how large halo could be manufactured after small halo? I thought large halo stopped in 1962 or so? Sorry for the badly lit pic.

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Topic - Philips Canada 12AX7 Code Question - Zedguy 17:38:44 10/23/14 (0)

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