Thanks for the replies. I want one in order to find out what this circuit sounds like:
https://www.aaroncake.net/circuits/torgan.asp
As 'transistor organs' are something of a cult classic of the 60s and 70s, in a sense I will be going back to 1976
. If on the other hand as one user said it just makes a basic saw wave, then that's less interesting but I might build it anyway, depending on whether I can get hold of a UJT. For some reason I keep imagining a theremin-like sound coming from a UJT-based oscillator...