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Howard

Electrocompaniet ECI-2

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Does anyone know if this runs in Class A up to a certain point? If so, at what point does it switch to Class B?

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Not sure but there is nothing in the manual I can see to suggest it's anything other than pure Class A:

https://www.manualslib.com/manual/599497/Electrocompaniet-Eci2.html?page=3#manual

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Posted (edited)

70W for a 2 x 50W O/P into 8 Ohm does not suggest class A all the way to max output.
 

Edited by Howard

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1 hour ago, Howard said:

70W for a 2 x 50W O/P into 8 Ohm does not suggest class A all the way to max output.
 

The specification says the 70 W power consumption figure is with 'no load or signal', so not what would be used if outputting 2x50W.

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Posted (edited)

I believe that Class A amps draw full  current at idle. And the maximum theoretical efficiency is 50%, in reality probably much less. 

I have one of these amps, it doesn't get hot enough and it's not heavy enough for 50W Class A. There's no fan. I can touch it without burning my hands. It doesn't heat the room much in winter. 

Edited by Howard

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On 16/03/2019 at 21:44, Howard said:

I believe that Class A amps draw full  current at idle. And the maximum theoretical efficiency is 50%, in reality probably much less. 

I have one of these amps, it doesn't get hot enough and it's not heavy enough for 50W Class A. There's no fan. I can touch it without burning my hands. It doesn't heat the room much in winter. 

Looking at the size of the heat sink - if this was a full class A amp then I would be surprised (it has less heat sink than a Sugden A21) .. also it says it does 100 watts into 2 ohms and again the amount of heat that would generate needs much more heat sink in my view.  In the absence of published specs I would suspect that it operates at class A into a limited number of watts and thereafter at class AB  (but I could be wrong) :shock:

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On 17/03/2019 at 00:44, Howard said:

I believe that Class A amps draw full  current at idle. And the maximum theoretical efficiency is 50%, in reality probably much less. 

I have one of these amps, it doesn't get hot enough and it's not heavy enough for 50W Class A. There's no fan. I can touch it without burning my hands. It doesn't heat the room much in winter. 

I would agree. I have a PS1200 AC power regenerator, which displays instantaneous power output. My 100 W class A amp, draws 505 W on start up. And it settles down to around 330 W. And irrespective of volume or amount of bass in the tracks, this doesn't fluctuate by more than 15W. So I think their power draw is constant, once their caps have been charged. 

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