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Old 31st August 2011, 08:42 AM   #1
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Default Pure Reference Class A Monoblock

Who knows more about this power amp from Pure Audio (sound quality, circuit topology) ?
go to
Pure Reference Class A Monoblock pureaudio
for looking the short form datas.
Power Consumption = 150 Watts and 2x 65 Watts continuous output power into 8 Ohms is definitely pure Class A. Perhaps even a single ended topology.
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Old 31st August 2011, 09:20 AM   #2
juma is offline juma  Serbia
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Quote:
Originally Posted by tiefbassuebertr View Post
...Power Consumption = 150 Watts and 2x 65 Watts continuous output power into 8 Ohms is definitely pure Class A. ...
1. 2 x 65W = 130 W
2. Maximal (theoretical) efficiency for class A amplifier (Push Pull) is 50 % and 25% for SE.
3. To make that claim (pure class A) believable, the power consumption would have to be at least twice as large...
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Old 31st August 2011, 09:43 AM   #3
Legis is offline Legis  Finland
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Sound too good to be an 16kg amp, I don't quite see the huge heat sinks that A-class needs. I would think that 2x65W in pure A-class would consume minimum of 300 watts at idle. 130w of max power with 150w consumption is nowhere near possible with pure A-class (consumption under max load should not rise from the idle consumption) so maybe it's some sort of "dynamic A-class" with sliding bias...?

It is also advertised to have fully regulated PSU, which basically means that there is another amp inside the amp (= more losses/inefficiency = more power to dissipate). Maybe the PSU is regulated SMPS, that would explain.

Last edited by Legis; 31st August 2011 at 09:50 AM.
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Old 31st August 2011, 09:55 AM   #4
RJM1 is online now RJM1  United States
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Actually if you read it’s a "monoblock" 1x65W not 2x65W so 150W dissipation sounds about right.
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Old 31st August 2011, 10:50 AM   #5
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Quote:
Originally Posted by tiefbassuebertr View Post
Who knows more about this power amp from Pure Audio (sound quality, circuit topology) ?
go to
Pure Reference Class A Monoblock pureaudio
for looking the short form datas.
Power Consumption = 150 Watts and 2x 65 Watts continuous output power into 8 Ohms is definitely pure Class A. Perhaps even a single ended topology.
Quote:
Originally Posted by RJM1 View Post
Actually if you read it’s a "monoblock" 1x65W not 2x65W so 150W dissipation sounds about right.
Yes, "2x65 watts" was a mistake from me.

Last edited by tiefbassuebertr; 31st August 2011 at 10:54 AM.
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Old 31st August 2011, 11:38 AM   #6
wahab is offline wahab  Algeria
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Quote:
Originally Posted by juma View Post
1. 2 x 65W = 130 W
2. Maximal (theoretical) efficiency for class A amplifier (Push Pull) is 50 % and 25% for SE.
3. To make that claim (pure class A) believable, the power consumption would have to be at least twice as large...
Fairly right , but the class A threshold can be increased using
relevant devices , namely , lateral fets.
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Old 31st August 2011, 11:52 AM   #7
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What does 'class A threshold' mean?
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Old 31st August 2011, 11:59 AM   #8
wahab is offline wahab  Algeria
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Quote:
Originally Posted by toprepairman View Post
What does 'class A threshold' mean?
The power at wich the amp quit class A mode and work in class B,
that is , with only one device conducting , the other one being
switched off completely.

Juma s estimation is correct , and even optimistic in many cases
since a 50% maximal efficency is not achieved by many designs.

Last edited by wahab; 31st August 2011 at 12:02 PM.
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Old 31st August 2011, 12:07 PM   #9
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OK, but it still won't be better then just under 50%, and I suspect bipolars in CFP will better even lateral Fets.
Of course the more relevant fact is that very few speakers rated at 8R will stay there.
Most will have impedance minima approaching 4R, so this amp will still dip into class B occasionally.
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Old 16th November 2011, 05:52 PM   #10
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Who have heard this power amplifier in the meantime?

BTW - Mr. Gary Morrison, the founder of this company, was no stranger.
http://www.monoandstereo.com/2011/10...re-series.html
Who We Are pureaudio

Last edited by tiefbassuebertr; 16th November 2011 at 05:57 PM.
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