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Is it a myth that SS amps change their sound as they warm up? (1 Viewer)

3dbinCanada

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I see two fundamental flaws with SS amp warmup and the audible differences people claim they hear. 1) The warmer the transistor becomes, the more thermal or Johnson noise is generated at the junctions of the transistor. It may or may not be audible but the point is that noise generation is increased at the junctions. 2) The warm up time claimed by people is many magnitudes greater than the time required to accurately recall the sound they were hearing when the amp was first powered on.
 

JohnRice

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I have varying experience. Generally It doesn't seem to take much time for solid state equipment to reach observably peak performance. However, I have an Aragon 4004II, which is a high bias A/B amp, 200 WPC into 8 Ohm biased Class A at 50 watts, that I swear took about an hour to reach optimum. Now I'm using Emotiva XPA-DR amps which are Class H and don't seem to need any noticeable warm-up. I can imagine that maybe 10-15 minutes, just to get up to operating temperature, but doubt much beyond that.
 

Edwin-S

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I would expect a "warmup" period to affect tube amps more than solid state devices. I've never noticed any difference in sound with my Yamaha receiver regardless of any time taken to warm up; however, people will believe what they want to believe. It is why a placebo medicine actually works on some people.
 

3dbinCanada

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I would expect a "warmup" period to affect tube amps more than solid state devices. I've never noticed any difference in sound with my Yamaha receiver regardless of any time taken to warm up; however, people will believe what they want to believe. It is why a placebo medicine actually works on some people.
I agree.
 

jcroy

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In my limited experience with guitar amplifiers, a heavily distorted solid state transistor amplifier sounded the same the moment it is turned on, regardless of what the volume was set to at the power on.

I don't know if there's any way to convince myself of the opposite, for heavily driven transistor guitar amplifiers.
 

jcroy

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Though in contrast, guitar amplifiers with vacuum tubes in the power amplifier stage does have a huge difference in sound AFTER the tubes are warmed up after a few minutes.
 

John Dirk

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My answer is "it may depend on the quality of the hardware design." People will always hear what they hear and I wouldn't go down the road of trying to prove or disprove anyone's experience. That said, place any decent SS amp on a test bench and it should remain stable and consistent across it's rated operating parameters. If it doesn't then it's a crap amp by definition.
 

jcroy

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I would expect a "warmup" period to affect tube amps more than solid state devices. I've never noticed any difference in sound with my Yamaha receiver regardless of any time taken to warm up; however, people will believe what they want to believe. It is why a placebo medicine actually works on some people.

Everyone needs a hobby and "fantasy" to believe in. ;)
 

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