A bloke's contacted me in the hope that I might know something about a simple oscilloscope his late father built many years ago. It's got a 2" RCA CRT and only four (octal) valves.
I've uploaded the photo he sent me, to
One of the visible valves looks like it could be a 5Y3G and another a
6J7G. A lot of the visible capacitors look like those yellow Philips polyester(?) ones from the 1960s but his father quite likely replaced original waxed papers caps with them.Does anyone recognise it?
Cheers, Bob