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
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.
68pete
586 posts
 
I think it really depends on what you mean by on and off. Turning your equipment on and off several times a day can not be good for it. Turning  your equipment on in the am when you get up then turning it off when you go to bed, i feel is much better.  I leave my solid state pre amp on all the time it does not have a stand by unless i am out of town i power it off. The same with my disc player. The screens on both units are set to go off 15 minutes  after the music stops. so there is no screen burn shadow on them. The amp is in stand by if not in use and is off when out of town. I was all ways told turning them on and off does more damage than leaving them on as long as they do not run real hot. plus they sound a lot better when they are fully warmed up to go. I talked with Mark  Levinson and Esoteric and this is what they recommend to me.
enjoy Pete
salevick
67 posts
 
I have another slant on this issue.  I pull the plugs on all my equipment when I leave for an extended period of time.  I live in an area that is prone to severe lightning strikes and no surge protector is sufficient to prevent the dreaded blue smoke.  I imagine I am shortening the life of some components of my gear but I think the trade off is worth it. 
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