I think OP has something to sell, but doesn't yet have an adequate post count.
Always OFF when not in use. and switched OFF from the Wall socket.
Charging and discharging is what causes internal heating. Hotter = shorter life.
Thanks, S-Man. Wasn't sure about your further advice (bit technical for me) but the above surely makes a case, AT LEAST FOR THE CAPS, of keeping them charged. I.e. that the Class B s/s amplification is kept powered.
This is copied from one of the current Exposure setup manuals/posters...
"Please note that your Exposure 3010S2D Integrated Amplifier may take up to 48 hours to run-in before reaching its optimal performance. Each subsequent "run-in will then take about 20 minutes."
AFAIK the only issue with amps is operating temperature so the 20 minute figure makes sense.
When it comes to DACs, I read some measurements showing the clock can take a lot longer to stabilise, I don't know why this is. That's why I have the DAC on from beginning to end of day (if there's a chance I'll use it).
Arkless Repairs has always seemed pretty consistent on the issue: switch amps off. E.g.
http://www.pinkfishmedia.net/forum/showpost.php?p=2038590&postcount=11
I too think audiophile ethernet cables are hokum Keith. But the phase noise measurement we have to assume isn't fabricated - maybe I should switch on the DAC the day before! Thanks Radamel.