[turretslug]

Haven't come across one of them, or any information on it, but it looks like a really nice piece of kit. If it does have production testing heritage, it should be a stable, consistent and reliable workhorse (once fully sorted- a common and slightly oxymoronic theme here with old gear generally seems to be, "they're great devices- once mended"!)

There seemed to be an interim period with high-grade test gear in particular where the metalwork and mechanics very much stayed with the "thermionic" way of doing things, even when semiconductors had very much taken over, and this looks like a classic example. Can't help thinking that the designer may have owned, used or seen a TF144H or TF995 at some point as inspiration....