Type ?sub_confirmation=1 after the channel URL.
It won't automatically subscribe them, but it will put a pop-up to prompt them and should increase subscription conversions of people who click your channel name.
Hey Paul – I don’t how I stumbled on this blog, but its great you have so many great tips and ideas spread throughout the blog. Love the youtube tip. Also love the simplicity and layout of the blog I know its weird in this day of colour and movement, but no-nonsense approach works for me. Keep the feeds coming.
Thanks James – happy to help and glad you found me.