I am intrigued by this video:
External Content
m.youtube.com
Content embedded from external sources will not be displayed without your consent.
Through the activation of external content, you agree that personal data may be transferred to third party platforms. We have provided more information on this in our privacy policy.
It is a very simple way of making a high electron density at a tungsten rod, giving a COP > 10 (!) over 30 minutes and with enough error margin to use simple garage calorimetry.
If this really works - it can be scaled up quite easily. What is your take on this?