This appears to be a Diode Test Set that was used inside HP as part of their manufacturing process. I got it from an eBay seller in Santa Rosa that's near an HP (now Agilent facility) Most likley this test set allows visulaization if the I-V curve of a diode. A sticker on the front says Modified, 1.2 ma 6 VPP. These limits would be approiate for almost any diode including microwave diodes.
The CRT is a 2BP1 and there is one each 6BH6 and 6J6A tube inside.
If you know what this was used for email to brooke(at)pacific(dot)net
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