Tony L
Administrator
The replica mk1 foams have 33mm wide 'bars' and 10mm wide 'spaces'. Also, I thought the mk1 foams were 10mm thick but they're actually 12mm thick (12mm at the 'bar' sections and 6mm at the 'space' sections).
I am just crazy OCD about this sort of thing and I came to the conclusion from studying original pictures that there is one more bar than that, i.e. there should be an odd number so one bar runs centrally over the logo/tweeter. Here’s my attempt:
I suspect this is very close indeed, but I also suspect JR used imperial measurements as (again weapons-grade OCD) I ended up about 3mm too long so they aren’t quite as tight as I’d like. Fixing it would involve working in fractions of millimetres to get it exactly right. Without having an original to hand I think I have the right number of bars and the right thickness (i.e. they should be slightly proud of the caps).
Here’s a brochure pic on Jim’s site that shows the top/bottom bevel. I’m pretty sure my red logo pair had these grilles. I’m happy where I ended up given I only had one go at it!