I have my own building apart from the house where I can listen.
Kind of man cave but then above ground 😛
The alternatives are either a switch mode Class AB amplifier with cross-over distortion or an inefficient Class A continuously conducting amplifier. There is nothing in between so there is nothing to invent.
Also, a complementary output stage will not have emitter follower but push-pull characteristics. Quite a difference.
That's according to the orthodox doctrine...
I made a test recording the other day, Night time, this just because I would not get any noise, from the nearby street, this even with closed windows as during the day there is rather lots of traffic some time. usually it don't disturb but for recording with microphone this is a no go.
So I hooked up Oscilloscope, which will read out RMS voltage as well as of course the Sound Curves.. and intended to record a few songs with 1WATT RMS Voltage.
Sorry, I ended up with 1.2Watt Peak to Peak.
My listening room is 4.50 X 5meter, speakers are 3.5meter and sitting position is about in the middle of it 2 meter to each speaker.
Camera (Nikon HD) was on tripod 1 meter in front of me, same height as the higher Woofer of that IQ Ted 4 Series.
To make a long story short: it was too loud.
To loud to listen, and also to loud to record.
Then cutting output power of the amp to 0.6 Watts RMS and it seemed to fit. But now I got some Echoes, in the recording, at low level sequences of the sound. But this is a Room problem. Even one can not hear it, when listening, it is easily heard when the sound has been recorded.
Amp delivers easy 28Watts into 8 ohms and more on my "4Ohm" Speakers. So the approach of Mr. Nelson Pass to create CLASS A AMPS - with First Watt - goes definitely into the right direction. I'm not going to talk about First Watt here, all of them sounding fantastic.And I think this is the reason that Mr. Pass calls this latest Series of his AMPS First WATT. this is usually the loudness which matters.
Going to talk about Class A in general.
Therefore I think that this max Current of twice the output power of a Single End Class A is quite a lot as BIAS, but if this is not there, then the Single End sounds Lousy.. Sorry this are just my feelings about.
But as stated before, we can work on the IDLE TIME - when the AMP is just waiting to work, meaning is burning up Power for nothing, then, to cut down Power there, so it wastes as little as possible is my approach.
I think this would SAVE Energy and it would not lessen or degrade the sound when in use as then full power must be available..
@RobertS61 Mine is E61 Touring. As you wrote, fine to drive is the minimum feeling one could say. For me it's exactly this, why I choose that car.
So I hooked up Oscilloscope, which will read out RMS voltage as well as of course the Sound Curves.. and intended to record a few songs with 1WATT RMS Voltage.
Sorry, I ended up with 1.2Watt Peak to Peak.
My listening room is 4.50 X 5meter, speakers are 3.5meter and sitting position is about in the middle of it 2 meter to each speaker.
Camera (Nikon HD) was on tripod 1 meter in front of me, same height as the higher Woofer of that IQ Ted 4 Series.
To make a long story short: it was too loud.
To loud to listen, and also to loud to record.
Then cutting output power of the amp to 0.6 Watts RMS and it seemed to fit. But now I got some Echoes, in the recording, at low level sequences of the sound. But this is a Room problem. Even one can not hear it, when listening, it is easily heard when the sound has been recorded.
Amp delivers easy 28Watts into 8 ohms and more on my "4Ohm" Speakers. So the approach of Mr. Nelson Pass to create CLASS A AMPS - with First Watt - goes definitely into the right direction. I'm not going to talk about First Watt here, all of them sounding fantastic.And I think this is the reason that Mr. Pass calls this latest Series of his AMPS First WATT. this is usually the loudness which matters.
Going to talk about Class A in general.
Therefore I think that this max Current of twice the output power of a Single End Class A is quite a lot as BIAS, but if this is not there, then the Single End sounds Lousy.. Sorry this are just my feelings about.
But as stated before, we can work on the IDLE TIME - when the AMP is just waiting to work, meaning is burning up Power for nothing, then, to cut down Power there, so it wastes as little as possible is my approach.
I think this would SAVE Energy and it would not lessen or degrade the sound when in use as then full power must be available..
@RobertS61 Mine is E61 Touring. As you wrote, fine to drive is the minimum feeling one could say. For me it's exactly this, why I choose that car.
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...well how about the Valves you like so much? From the energy point of view totall waste. Not even including that semiconductors last way longer if not abused thermally. So the sustainability of a Valve is rather bad.
Should I now tell you please go and get rid of your ancient technology? No! because I understand that Valves have a specific sound signature which is difficult to copy with pure semicondutor builds...one might argue class A is not the same as class D even if properly done....
Touching already ancient times ....."the innocent throws the first stone".
Just bought a IR Thermometer and the front measures 33 degrees Celcius, the heatsinks 50 degrees Celcius (30 degrees over roomtemp.)
Cos Phi is 0.80, I've had worse with a Levinson ML-3 (0.63)
https://www.diyaudio.com/forums/attachment.php?attachmentid=942654&stc=1&d=1618495148
https://www.diyaudio.com/forums/attachment.php?attachmentid=942655&stc=1&d=1618495148
Cos Phi is 0.80, I've had worse with a Levinson ML-3 (0.63)
https://www.diyaudio.com/forums/attachment.php?attachmentid=942654&stc=1&d=1618495148
https://www.diyaudio.com/forums/attachment.php?attachmentid=942655&stc=1&d=1618495148
