Peter Jensen, VK2AQJ, has done a wonderful job of re-creating one of the versions of the set and in tracing the history of these interesting rigs. The simple design uses three metal valves and the receiver covers about 3.2 to 8MHz.
Peter is a wonderful speaker and I understand has published at least one book which I'll track down.
I bought a little bit of junk for the shed today although there is lots to temp me in the Dural disposals room.
Thanks as always to the organisers and it was great to have Mal, VK2BMS, along for the day.