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G8HQP Dave · 4th Feb 2019, 2:09 pm

Yes, I believe 9r1 is the code on picture 4. 9r is the type code for EF86 en. Or could 9r1 be a date code - so 9 means the Heerlen receiving valve group? Would that be a better fit with what may be an experimental valve?

4th Feb 2019, 2:09 pm	#19
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: Mystery Valve Yes, I believe 9r1 is the code on picture 4. 9r is the type code for EF86 en. Or could 9r1 be a date code - so 9 means the Heerlen receiving valve group? Would that be a better fit with what may be an experimental valve?