Hello Hans
Oh dear, how red can a face get, they are of course BS170s! Even worse, I do now recall reading the explanation of the code when I built the kit. Also, I had the frequency set to 7,040,000 in error as I think it should have been 7,040,100 which of course gives me the familiar 100 code. So, not a dumb question at all!
However still no spots, whereas when I first built it, I was getting spotted on most TX phases. I think maybe I'll just build another one rather than chasing the fault.
Many thanks for your prompt and helpful reply.
Best wishes
Chris