TinyScopeA simple all-valve 1-inch oscilloscope by Ian Wilson K3IMW and Hans Summers G0UPL This oscilloscope uses a 1-inch diameter Mullard DH3-91 CRT. Some nice pictures of the DH3-91 are here. I found it at a car boot sale, priced 1. I'm ashamed to say I didn't recognise what it was: I only bought it because it looked wierd and interesting! Ian did the main design and prototype work on the 'scope, then I
