On 8 August 2013 18:58, John Phillips <john.phillips0 at gmail.com> wrote: > You will find that most old "stuff" does not drift as much as the new > "stuff". > Most resistors seem to drift in a damped sine wave rate with a period of > about 4 years. Is there any theory behind that? It's the first time I have heard of the 4 year damped sine wave! Dave