[Radio Wrangler]

Ah-ha!

It's changed from shunt to series feedback!

There's a resistor in series with those neons so they don't drive as much noise into the output!

The doesn't do what it says on the can tape loop has gone (and taken the input switch with it)

So he's experienced and had to fix most of the things to be found in the first version, or he's had some guidance.

Anyway, it's always nice to see that problems can be spotted ahead of them being discovered by those taking the long way round.

Asimov's positronics never turned up, so it's a shame we don't have complementary valves, they'd make things easier.

David