Hello Phillip,
Mine is a no. 1 mark 1 I.A., not a no. 7. That may explain the differences you found. Personally, I don't have a clue how these things work, but would welcome an education. Great piece of equipment. I must get a battery and try mine, when I get a chance. I hope the voltage is written on the bulbs, because I don't even know that much.
There are still some available from where I bought mine, and at $40, I think that's pretty reasonable. Especially when you get the privilege of opening the storage box that has been sealed up since last checked in mid (in my case) 1980s. Not exactly comparable to finding the Dead Sea Scrolls, but a different kind of treasure, regardless.
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Ford CMP, 115" WB,1942 (Under Restoration...still)
Medium sized, half fake, artillery piece project. (The 1/4 Pounder)
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