On Sat, 21 Apr 2018 08:32:33 +0100, "Brian Gaff"
wrote:

Obviously, but that is hardly an answer to the problem but might help you
keep fit if you like step exercises!

Quite.

The fact that the voltage is still enough to operate the starter still
points to the spec being incorrect for the job.

I agree Brian. I believe the spec (4-80W) should be good for my 70W
tubes so it could just be that they are weak units.

It was suggested that along with the gas used in the starter capsule,
the initial distance between the electrodes can also set the strike
voltage?

Cheers, T i m