2. amps-preamps
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Amps and Preamps has standby, but should I turn them completely off?

Hi guys, I know there has been discussions of this and the overall consensus seems to be leaving the Solid State amps / preamps on (or standby). I have a Parasound A51 that runs pretty hot. The heat sinks are hot to touch after running them for 2 hours. Ever since I move them to the 2nd floor (gets hot in the summer), I worry that they'd run too hot so I turn them completely off (by switching off the surge protector) after each use. Note that standby mode doesn't solve the heat issue -- it still generates a significant amount of excess heat. 

My question is:
1. Does turning them off after each use shorten their life?
2. Does turning them off increase the probability of failure?
3. Does the excessive heat damage them in the long run by leaving them on?

I am not too worried about warm up time because I use them 2-3 times a week tops. I just don't want the excess heat on the 2nd floor since it's already much warmer than the 1st floor. 

Thanks!!
angelgz2
yogiboy's avatar
yogiboy
2,678 posts
 
1.No
2.No
3.Yes
 
timlub
1,649 posts
 

1. It Can, depends on usage....

My experience that the thing that makes things like filter caps go out is constant cycling... they will actually last longer if never turned off.  If seldom used, turning them off will increase life,  if used everyday???

2. See

timlub
1,649 posts
 

Sorry...

2. See Number 1

3. Excessive heat can damage anything electronic.  Pure Class A really produces heat.... I had an extremely modified old Sumo Nine, it is Pure Class a, Meaning no sliding bias or current and it stayed in Class A at all power levels regardless of impedance... This thing could fry an egg... I vented it and changed the fan and still left it on... Until my house was struck by lightening,  it was great.

terry9
931 posts
 

I think it is a little complicated for a categorical response.

Semiconductors do not like to be switched on and off. Neither do they like to run really hot, and some heat sink compounds can dry out.

Electrolytic caps (aka power supply caps) do not like to be turned off and on. But they really hate being hot.

All told, I think that turning on and off is better for a unit that runs hot. Especially if heat is inconvenient, or you don't own the power company.

brauser
421 posts
 
I turn off my preamp and cd player, but leave my mono amps on all the time. The reason is that keeping the amps on causes a small amount of current to go to the speakers and acts as a 'sealing current' to the connections. The mono amps do not run hot and they are in a cool environment. The preamp and cd player take some time to warm up, but don't seem to be affected by not being on for extended time frames.
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