Cheers for the tidy up
The Daws unit appears to be pretty close to what I was expecting except for the counter being additive only with a count that starts below what is expected frequency stopping when the unknown frequency period is reached with the indicators wired as a user display only.
I have chosen a LW radio to do the radio4 beat test with while we have some fun checking out the crystal oven. It has to be on the web to fit in with the forum
It will be tomorrow now as there were a few household distractions today.
The original photos show the air filter that had turned to dust and the only other work was to replace a capacitor that felt warm to the touch and the new one still felt warm but somewhat less so.
Well with sheets of 74 series logic in there it did not startle me in any way.
I used a Wilco vacuum cleaner motor filter that is sadly now discontinued as a replacement for the dust.