I just received an old 2401A pack, actually, the 2401a, a 1211 Piggy Pack and an 1801 that has been upgraded to a 2401, and five heads, 202s I was told. Here's the 2401a which I believe is the newest of the trio. Click image for larger version. 

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It was quite dusty and had been stored in an out-building for quite a few years but not sure how many. I was told they worked before being put into storage. Some of the screws are rusted, but all the connectors and switches seem fine.

I've attached a power cord and one head and powered it on. The power light came on, I switched the modelling light on and the fan on the head came on, but no modelling light. I didn't trigger the head... a little unsure of this thing so wanted to ask what might be the best way to proceed.