Kevin Ravenhill wrote:

.... it hears things on 136kHz, which is what matters, ...

What an intriguing circuit - I read up on the "Spontaflex" on this web site:
http://www.spontaflex.freeserve.co.uk/autoflex/autoflexpage1.jpg
I had not heard of it before.

I wonder how you demodulate CW signals - do you allow the circuit to
oscillate as you would do with a conventional regenerative circuit ? The
basic Spontaflex seems to be an AM receiver.

73
Hugh M0WYE