WS 19 spare tube box

[David Dunlop]

Glad you did, Bob.

I trolled eBay this morning and found three more American made Spare Valve Cases for the 19-Set. All the same wrinkle OD Green, with brass hook closures, and all of them show the second E1148 valve to the right of the 807 Valve position. This is really intriguing me now.

If the American 19-Set production was mostly, or all, MkII related, it raises some questions.

(1) Did all Mk II 19-Set Spare Valve Cases made in Canada and the USA have two E1148 Valves, and if so, why?

(2) What improvements were made between the Mk II and Mk III 19-Sets that allowed for only one E1148 spare valve and an extra 6K7G to be added?

(3) Was the pair of E1148 valves unique to American production only, and if so why?

(4) If all Mk II 19-Set Spare Valve Cases were issued with two E1148’s, has anyone ever seen a Canadian made case with this configuration?

David