Valve preamp.

[Terry]

And that 100pF input capacitor is hardly likely to produce a broadband response!

I appreciate that's probably humour, as it's clearly a µ, and is drawn as a polarised cap. And you can see it on the photo of the completed boards.

No Mark, it was a very stupid mistake on my part.

At a quick glance I mistook the µ for a ρ. I also failed to spot the polarised symbol.

I looked at and admired the photo but still didn't spot my mistake!