The SC22 is only really of use to collectors and as it's in mint condition, it should fetch a hundred or three (hifi dave sold a slightly tatty one recently and got a couple of hundred for it IIRC).
The MA15 is another matter and it may take a long time to find another single one. I understand that these are the best of the series and valuable because of it. Having said this, in real terms a good modern ss or valve amp would probably eat it alive in the real world out there, despite the Radford being one of the very best of its period. Don't be hard on yourself if you sell it instead of keeping it and waiting for another to come up, there's always a Croft Series 7 instead
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me