GZ37 CV378 Mullard (UK) NOS-NIB
tested on Amplitrex
Factory code (sample) IS1 = GZ37 1st series
87F3 = 8= Philips Eindhoven factory
7= Year of manufacture 1967
F= Month of June
3= 3rd week
Date codes may vary slightly but are mostly from 1967, series IS1
from old stock, some in new boxes, original print in various good condition, O-getter, triple mica, brown base, with Mullard typical visible reddish copper on the anode sides.
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