Testing, Testing...

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Pictured is another rescued item from Mac's small workshop: his Model 40 AVO meter, manufactured in May 1947 and in his possession for most of his life. As can be seen from the picture, it's in a bit of a grubby state, but generally it seems to be in quite good nick.

However, some very old batteries lurk in the battery compartment: the two 4.5V cycle batteries seriously swollen and which will need extricating by some devious means, and the replacement 1.5V cell will need to be unsoldered and replaced - the two bike batteries can be swapped out for a 9V PP3 - so I'm going to have to dismantle the thing and remove the battery box.

Hopefully the batteries won't have leaked too badly and the internal damage minimal. A nice little project, and these days I can just calibrate the meter against a modern digital unit when it's all cleaned up. Keep you posted!

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