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Old 15th July 2014, 10:00 AM   #21
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When I entered the World of Class A I started with 40W, that was fine until I wanted to drive it to the max. I've now moved up to 100W Class A and that is enough for domestic listening. The speakers are quite inefficient though at 89dB/W.
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Old 15th July 2014, 10:13 AM   #22
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Originally Posted by KatieandDad View Post
When I entered the World of Class A I started with 40W, that was fine until I wanted to drive it to the max. I've now moved up to 100W Class A and that is enough for domestic listening. The speakers are quite inefficient though at 89dB/W.
I've now moved up to 100W Class A

What schematic?
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Old 15th July 2014, 10:33 AM   #23
ItaPapu is offline ItaPapu  United States
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Originally Posted by moschfet View Post
It is scientifically proven that under 2000 watts no real music reproduction is possible.
To suggest otherwise, suffers from severe loss of reality.
I would rather say " severe loss of" hearing!
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Old 15th July 2014, 10:59 AM   #24
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Originally Posted by thimios View Post
I've now moved up to 100W Class A

What schematic?
I'm using a Pass Aleph 4. Plenty of information on here on how to build one.

Good starting point is http://www.kk-pcb.com although I wouldn't use his pcbs.

100W Class A is a serious investment. With all Class A projects you will need massive PSU and heatsinks.

That took some finding but here is Dad's thread on building this beast. He's no longer with us but his legacy lives on.

Aleph 4 Strickly DIY Project Build
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File Type: jpg DSIR0185.JPG (233.2 KB, 284 views)

Last edited by KatieandDad; 15th July 2014 at 11:15 AM.
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Old 15th July 2014, 11:23 AM   #25
Bonsai is offline Bonsai  Taiwan
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I have 15 watt class A, 2 100 watters, a 180 watter (actually a 220 watter) and a 280 watter.

I've got B&W 703's and a very nice pair of small bookshelf speakers from a local Taiwan company.

The 15 W sounds remarkably capable on my 703's and they make a great pairing for acoustic and light jazz.

But the big amps sound more relaxed in the nicest possible way.

I'd love to hear the class A on a really efficient set of speakers because it has a wonderful silky sound.

I am planning another amp. A really big one. Probably early next year. 4 kVA transformer is quite expensive, even in Taiwan. It will be my mid- life crises amp, like that guy over on the tube forum, although a am a little past mid life now - I just like soldering and sh1t. He he

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Old 15th July 2014, 11:28 AM   #26
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I'm pushing B&W 802D's, they need a bit more power to make them sound their best.
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Old 15th July 2014, 11:39 AM   #27
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Usually 20 watter. Have 250 watter and 180 watter which haven't been used much for the last couple of years.
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Old 15th July 2014, 01:04 PM   #28
AndrewT is offline AndrewT  Scotland
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Originally Posted by Bonsai View Post
.................... 4 kVA transformer is quite expensive, even in Taiwan................
I bought a 3kVA 110V site transformer.
Handy for 110V site tools while building my house.
Hardly gets used now, just collecting dust at the back of the garage.

It has a 55-0-55Vac secondary that would make for a very high power amplifier.

Secondhand they are relatively cheap.
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Old 15th July 2014, 01:43 PM   #29
Pano is online now Pano  United States
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It's a question with no easy answer. Not even 42 or 10, tho those are close.

If you are interested in what size amp might fit your speakers, ears and room, try the test in my signature line.
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Old 15th July 2014, 01:46 PM   #30
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Originally Posted by jazzclassics View Post
What is the best power for an audio amplifier?
SOLAR


100W RMS into 8-ohms, 200W RMS into 4-ohms

Limit the Class-A power to ~10W for modest normal heat, and use "perfect Class-AB bias" to minimize high-power distortion.

When you design a few amplifiers you quickly learn that the best transistors( lowest noise, highest gain, most linear) have reasonable rated limits in voltage, current, and power, with the best circuit topologies.

Last edited by LineSource; 15th July 2014 at 01:50 PM.
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