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Old 3rd February 2012, 10:22 PM   #1751
bcarso is offline bcarso  United States
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Originally Posted by anatech View Post
[snip]

Does an asymmetric slew rate really matter at all? Presumably, we avoid getting anywhere near the slew rate limit of any signal electronics. I don't think that a difference in slew rate is going to matter in that case. If we are near the slew rate limits, we have other problems as well. Making the slew rates the same is not going to help much. [snip]

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I like the discussions in Bruno Putzeys' article in Linear Audio Volume 1, "The F-Word". Opinionated but loveable, as used to be said about a TV personality in Los Angeles.

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Old 3rd February 2012, 10:32 PM   #1752
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Quote:
Originally Posted by anatech View Post

Does an asymmetric slew rate really matter at all? Presumably, we avoid getting anywhere near the slew rate limit of any signal electronics. I don't think that a difference in slew rate is going to matter in that case. If we are near the slew rate limits, we have other problems as well. Making the slew rates the same is not going to help much.
It does, Chris
And you are right, the same illness is reflected on other problems, like intermodulation of signals and their envelopes by phase and amplitude that sounds alien to perceprion of sounds. Especially, when they are high pitch signals, even ten microsecond between channels screws down image localization.
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Old 3rd February 2012, 10:48 PM   #1753
wahab is offline wahab  Algeria
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Originally Posted by Wavebourn View Post
[B][I]Especially, when they are high pitch signals, even ten microsecond between channels screws down image localization.
Moving one of the speaker by 3.4 mm would make a difference ?...
Are you serious , Wavebourn ??...
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Old 3rd February 2012, 11:00 PM   #1754
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Originally Posted by a.wayne View Post
I heard in Siberia , everyone has 200 output tube OTL amps, in the ole days you could get Russian OTL amp or heater ...
Yes, and they work on firewood.
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Old 3rd February 2012, 11:01 PM   #1755
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Originally Posted by wahab View Post
Moving one of the speaker by 3.4 mm would make a difference ?...
Are you serious , Wavebourn ??...
Waving speaker on 3.4 mm will be audible. Dynamics matter.
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Old 3rd February 2012, 11:08 PM   #1756
a.wayne is offline a.wayne  United States
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Originally Posted by wahab View Post
Moving one of the speaker by 3.4 mm would make a difference ?...
Are you serious , Wavebourn ??...
Yes, it will make a difference , 25mm it's a different system , 3.4 MM you will notice the change in focus ...
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Old 3rd February 2012, 11:15 PM   #1757
wahab is offline wahab  Algeria
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Originally Posted by Wavebourn View Post
Waving speaker on 3.4 mm will be audible. Dynamics matter.
I was talking of a displacement but still in a statical position...

Even with a waving i doubt that it would have any audibility.

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Originally Posted by a.wayne View Post
Yes, it will make a difference , 25mm it's a different system , 3.4 MM you will notice the change in focus ...
For such a position dependant quality of sound the listening room walls has to
somewhat be ressembling to some swiss cheese.....

Click the image to open in full size.

Last edited by wahab; 3rd February 2012 at 11:26 PM.
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Old 3rd February 2012, 11:23 PM   #1758
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Originally Posted by wahab View Post
I was talking of a displacement but still in a statical position...
Yes, plus-minus shoe does not matter when you are far enough.

Quote:
Even with a waving i doubt that it would have any audibility.
It had been proven in clean nice experiments with spark gaps and random people.
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Old 3rd February 2012, 11:28 PM   #1759
wahab is offline wahab  Algeria
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Quite possible , but anyway our speakers are supposed to stay at their
place , reliably....
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Old 3rd February 2012, 11:37 PM   #1760
jcx is offline jcx  United States
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Originally Posted by Wavebourn View Post
Yes, and they work on firewood.
Thermo-Electric Generators.

" The Improved Clamond Thermopile: 1879.
The EMF of this pile was no less than 109 Volts, with an internal resistance of 15.5 Ohms. The maximum power output was therefore 192 Watts, at 54 Volts and 3.5 Amps.

This pile was fired by coke. The hot junctions were at C, while the cold junctions D were cooled by sheet iron as in the original design above. What purpose was served by the tortuous path T-O-P taken by the hot gases is unclear, because there seem to have been no hot junctions in the inner sections.
This beast was 98 inches high and 39 inches in diameter...


"A Russian thermo-electric generator based on a kerosene lamp.
This lamp was introduced in 1959, once again to power radios. Presumably there were parts of Russia that Stalin's electrification program had not reached. The output voltage(s) are unknown, but since a picture is known to exist of it powering a valve radio, HT must have been generated somehow, possibly by a vibrator power supply.
(In this context a vibrator is an electromechanical device, similiar to an electric bell, that chops low-voltage DC into crude AC that can be applied to a step-up transformer. They were widely used in car radios before semiconductors arrived)

I have just been informed by Pine Pienaar that he has seen one of these things, and it yielded both 1.5 and 90 Volts, so it could replace a composite dry battery with the same output voltages. Such batteries were once widely used to operate small radios.
Such radios typically used four 7-pin valves and needed a 90V HT supply at around 12mA and a 1.5V filament supply at 125mA or 250mA depending on the valves used.
...

Last edited by jcx; 3rd February 2012 at 11:39 PM.
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