I have an 811k in the garage I started restoring about 15 years ago before I got distracted. Last time it was powered up it played. Poorly. Then I noticed a faint whiff of smoke from the rear corner of the chassis where the transformer lives and it stopped playing. I have a potential replacement transformer (assuming that's what smoked) and it's just a matter of getting a round tuit before it will play again. It's quite a piece that deserves better than indefinite storage.
But........ In consideration of other things that make no sense........ (click the pic, Seymour...)
Why anyone in their right mind would bid on an HP-410B when a perfectly decent DMM can be had for the same money is beyond my comprehension. Especially since that's exactly what I wanted to do when I first saw it. Sure, it's HP. The squidmatic is freely available on BAMA
. The tube complement is easy-squeezy to replace. Aside from the precision resistors and a ballast tube there's nothing exotic inside. It appears to have lived a good life with proper care. In the history of VTVM's this is likely one of the most desirable models, even if it does use an AC probe with an internal diode tube like most of them did. Plus, the DC probe needs an internal 1 meg resistor.
But........ It's from the Pahbulous Phifties. Like me. What more do we need to know?NOTE TO VINNIE: CLICK HERE FOR SOMETHING YOU NEED !!
Seriously... It's a whole 'nother concept in operating mobile.