On Tuesday, August 23, 2016 at 10:25:09 PM UTC-7, gregebert wrote:
>
> 40 *years* ? How many hours per day are you running your tubes ?
>
Mine has been running 24x7x365.25, with brief exceptions for things like 
moving to a new home, power outages due to earthquakes (California!) and 
weather, etc.  The other two were gifts, but I have not needed to replace 
any tubes in those (and I get to check on them occasionally).   It was a 
basic design typical of the 1970s: linear power supply and a CT7001 clock 
chip.  It did not have the additional circuitry that would have been 
required to dim the bulbs or turn them off.  At $1/tube, there was no 
incentive to complicate the circuitry in an attempt to "extend" the life of 
the tubes, and as the experiment has demonstrated, it would have been a 
waste of time and effort.

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