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turretslug · 4th Mar 2018, 9:45 am

It does seem out of kilter, I think of the loctal base as a (just) pre-war US Sylvania development, though the very similar principle B9D was famously a Philips thing. The main advantage of a loctal magic eye would be that it would be short, fitting in with the post-war trend for sets to be more compact, possibly the EM71 represented an evolution of the separate-base EM11 in this respect with a base for which tooling and sockets already existed.

4th Mar 2018, 9:45 am	#46
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,397	Re: The oddest valve? KLL32 It does seem out of kilter, I think of the loctal base as a (just) pre-war US Sylvania development, though the very similar principle B9D was famously a Philips thing. The main advantage of a loctal magic eye would be that it would be short, fitting in with the post-war trend for sets to be more compact, possibly the EM71 represented an evolution of the separate-base EM11 in this respect with a base for which tooling and sockets already existed.