Re: 6Q7G Valve, what brand ?
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.
My guess is that a British maker simply copied an American design, as there was a war on. As Brimar did this for almost all their range they must be the prime suspect, but it could have been someone else.
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