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Old 4th February 2013, 03:52 PM   #91
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Officially banned or not , to me it makes no difference at all, as I have already banned class-A power amps. From an engineering standpoint class-A is not interesting, not challenging. It's the most boorish (and expensive) approach to make amps better.

Cheers,
E.
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Old 4th February 2013, 04:26 PM   #92
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PS: Also the designers of such amps should be banned. Below 50W is good for a long stay on St. Helena. Above 50W should be punished with a ban for ever on Elba.
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Old 4th February 2013, 04:30 PM   #93
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Quote:
Originally Posted by Johnny2Bad View Post
The "efficiency" of a light bulb is based on wanted output versus unwanted output.

If you look at an incandescent light bulb as a light source only, and because I'm lazy let's use an efficiency of 20% (energy applied to light) then they are quite inefficient.

But, the remaining 80% is output as heat.

What if the heat is also wanted? Then they are 100% efficient.

Any place on the planet where you have a heater in your home, to raise the ambient temperature over the outdoor temperature, an incandescent is 100% efficient because it produces 20% wanted light and 80% wanted heat. And 100% of that heat is heat you don't need to use the heater to create.

If politicians actually had any brains ... if the "greens" who live north of about latitude 40 N actually could think instead of act like slathering sheep ... then what they would be mandating is incandescents in winter and [some other] lamp in summer.

BC Hydro (power utility in British Columbia, Canada) did a study a few years ago, which showed a province-wide shift to CFL bulbs would result in a fairly major increase in natural gas use to compensate for the lost heat. Throw in the power factor of CFLs and the shift becomes an increase in Carbon Emissions, not a decrease.

Same thing for amplifiers. If it's Class A and it's winter, it's 100% efficient. If it has vacuum tubes and it's winter, it's 100% efficient. And since they all (bulbs, amps) have a much friendlier power factor, they save energy over the alternatives, even if the alternatives were also 100% efficient (wanted light, wanted sound, wanted heat).

Yesterday it was -37.4C overnight. And naturally, the first thing I though was ... I need in my home light bulbs that generate less heat.

Where I live, in summer, the sun gets up at 3AM and falls at 11PM. So, you don't even really use artificial light in summer.

Believe it or not there are people who want us to change to Daylight Savings Time (we don't observe it in my province). You know, so mothers can try to get their kids to bed when the sun is going down at midnight. If there was such a thing, we should switch to Daylight Spending Time, get to bed at 10.

Where I work, which is still within the provincial boundary, in summer you get a kind of sunset/sunrise that flirts with the northernmost horizon for two hours. Near the solstace it's legal VFR Rule flying 24 hours a day (sun never goes 6 degrees below the horizon). You can go anywhere anytime without a flashlight and see just fine.

But, we need Daylight Savings Time.

Some people are such idiots.


Good.

This post deserves to be repeated.
The fools who made the ban over incadence lamps know bnothing about living close to the North pole. We have to turn up the heaters to compensate for the "low energy"-lamps, wich by the way contains mercury wich I think is a rather bad idea to spread around as this ban does.
And what is the real energy saving, when they had to establish an extra transport system to collect theese lamps wich is indeed high risk waste?
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Old 4th February 2013, 06:13 PM   #94
Bigun is offline Bigun  Canada
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The trouble with using incandessants in the winter is that if yuo want CFL in the summer you have to go around chaning them - and when you do the colour spectrum changes and so does the time it takes to turn it on and reach full output. So where I have CFL's I just leave them on 24-7 so I don't have to wait for them to warm up.
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Old 4th February 2013, 06:40 PM   #95
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Default homework

>What if the heat is also wanted? Then they are 100% efficient.
O RLY? Heating with electricity is only 50% efficient.
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Old 4th February 2013, 07:29 PM   #96
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Quote:
Originally Posted by Bigun View Post
The trouble with using incandessants in the winter is that if yuo want CFL in the summer you have to go around chaning them - and when you do the colour spectrum changes and so does the time it takes to turn it on and reach full output. So where I have CFL's I just leave them on 24-7 so I don't have to wait for them to warm up.

Summers here in Norway may be so light anyway, so the lamps aren't in use then
The only benefit living close to and north of the polar circle.
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Old 4th February 2013, 09:06 PM   #97
wahab is offline wahab  Algeria
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The most striking with many popular class A amps is that they are
well below a decently designed AB class amp in respect of perfs ,
wich is paradoxal for amps branded as "better sounding".

My main design guideline is reliability so i prefer AB class amp
with signal detection to reduce losses as much as possible,
i even reduced the PSU of my amp from +-55V to +-22V
with a circuit that reduce the iddle current to about 10mA
when no signal is present and the amp is on 24/7 since
a few years....
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Old 4th February 2013, 09:35 PM   #98
Bonsai is offline Bonsai  Taiwan
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Class A is good. It definitely has its own (good) sound.

As for banning it, maybe there are a few other things that should be in front of the line.
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Old 4th February 2013, 09:45 PM   #99
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>It definitely has its own (good) sound.
An amp that has its 'own sound' (whatsoever) is not a hifi amp, rather a kind of (unintended?) musical instrument.
>there are a few other things that should be in front of the line.
Moderators, for example?

Cheers,
E.
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Old 4th February 2013, 10:04 PM   #100
wahab is offline wahab  Algeria
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Assuming 200W useless thermal dissipation for a mid power class A
amp , this will require a nuclear reactor for each five millions users....

Think about it if 50 millions users get class A.
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