Re: Marconiphone Type 41
A forum member is kindly going to send details of a 31 coil.
It must have been stored in a loft outside the cabinet but it is now clean after stripping down every nut & bolt. There is some loss of plating to the spring contacts and surface rust to the transformer and variable resistor casings but as it's mostly plated brass it's not too bad overall. The pic is with the casing off the 'Rejector', a resonant circuit wired in series with the aerial.
I have had a go at the 1M grid leak resistor. It is made of two removable brass end caps and a black tube. The tube material looks similar to other moulded parts and has marks on the outer surface suggesting it was turned or maybe trimmed but an article at Radiomuseum suggests it may be silicon carbide. It was 3M so I soldered a 1.5M internally and it's now 760K so it seems to be variable!
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