Quote:
Originally Posted by G8HQP Dave
As far as I know, Brimar never used alphanumeric codes. Just numeric codes. Y10M may or may not be a Philips code, but it looks more Philips-like than Brimar-like.
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Unfortunately, I know next to nothing about Brimar markings so I'll take your word for that.
Philips did indeed use alpha/numeric/symbol markings, but this code doesn't really make a lot of sense according to what I know of their coding systems. The valve was meanwhile identified as not being a Philips/Mullard made valve, so that's a bit of a moot point anyway.