| date | change |
|---|---|
| Apr 25th 2021 | Recommenced updating the site again, added MCPU extension presentation: XMPCU-v2.0.pptx |
| Nov 10th 2008 | Started this site at www.tetrode.co.uk This site contains revised content from my previous site www.thermionic.org and also new non-thermionic material |