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  #11  
Old 02-24-2022, 06:16 PM
meltemi meltemi is offline
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Originally Posted by Iansr View Post
Do Accuphase Class A amps operate purely in A or do they move into AB when more watts are required?
The watts in Class A specified by Accuphase are guaranteed and you should also pay attention to the fact, that the specs are not only given for 8Ω, but also for 4Ω, 2Ω and on some models even for 1Ω.

As an example an E-650 is specified for 30w class A @ 8Ω, 60w class A @ 4Ω and 120w class @ 2Ω (they call it guaranteed linear power).
This is significantly more power (current) than a 30w tube amp has to offer, especially for the low impedance / low frequency range of a speaker.

In addition, on some models there is a 'headroom' of 2 - 3 dB before clipping.

Martin
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  #12  
Old 02-24-2022, 06:28 PM
Iansr Iansr is offline
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Accuphase virgin question; what do the various amplifier designation letters denote eg A, E, P, M ?
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  #13  
Old 02-24-2022, 06:36 PM
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Quote:
Originally Posted by meltemi View Post
The watts in Class A specified by Accuphase are guaranteed and you should also pay attention to the fact, that the specs are not only given for 8Ω, but also for 4Ω, 2Ω and on some models even for 1Ω.

As an example an E-650 is specified for 30w class A @ 8Ω, 60w class A @ 4Ω and 120w class @ 2Ω (they call it guaranteed linear power).
This is significantly more power (current) than a 30w tube amp has to offer, especially for the low impedance / low frequency range of a speaker.

In addition, on some models there is a 'headroom' of 2 - 3 dB before clipping.

Martin
While Accuphase amps do double in power output as load impedance halves, that power rating is only specified in Class A at the 8 ohm load. That's common with most fixed bias Class A power amp designs since they can't dissipate enough heat to maintain Class A bias at the higher power levels.
https://www.accuphase.com/model/e-650.html
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  #14  
Old 02-24-2022, 10:50 PM
meltemi meltemi is offline
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Quote:
Originally Posted by Iansr View Post
Accuphase virgin question; what do the various amplifier designation letters denote eg A, E, P, M ?
A: class A power amps (mono and stereo)
C: preamps
DC: separate D/A converters
DG: digital (graphic) voicing equalizer
DP: digital transports (CD and CD/SACD) and CD and CD/SACD players with integrated DACs
E: integrated amps (class A and class AB)
P: class AB power amps (stereo)
M: class AB mono power amps
T: FM tuners

Martin
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  #15  
Old 02-24-2022, 10:59 PM
meltemi meltemi is offline
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Originally Posted by audio bill View Post
...that power rating is only specified in Class A at the 8 ohm load
Sorry, but nope. On the datasheet, https://www.accuphase.com/cat/e-650_e.pdf, power is specified (and guaranteed) for 1-ohm , 2-ohm, 4-ohm and 8-ohm loads.
Under normal operating conditions you will not have to fear any power restrictions due to thermal limitations.

Martin
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  #16  
Old 02-24-2022, 11:44 PM
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Quote:
Originally Posted by meltemi View Post
Sorry, but nope. On the datasheet, https://www.accuphase.com/cat/e-650_e.pdf, power is specified (and guaranteed) for 1-ohm , 2-ohm, 4-ohm and 8-ohm loads.
Under normal operating conditions you will not have to fear any power restrictions due to thermal limitations.

Martin
Their Class A amps are capable of enormous power on demand.
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  #17  
Old 02-25-2022, 05:10 AM
Iansr Iansr is offline
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Thanks Martin that is helpful.
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  #18  
Old 02-25-2022, 05:16 AM
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Quote:
Originally Posted by meltemi View Post
Sorry, but nope. On the datasheet, https://www.accuphase.com/cat/e-650_e.pdf, power is specified (and guaranteed) for 1-ohm , 2-ohm, 4-ohm and 8-ohm loads.
Under normal operating conditions you will not have to fear any power restrictions due to thermal limitations.

Martin
But it does not say how many watts in class A it delivers for loads lower than 8 ohms. It is almost certainly going into AB when driving low impedances at at higher volumes
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  #19  
Old 02-25-2022, 09:53 AM
pabe12 pabe12 is offline
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Quote:
Originally Posted by Iansr View Post
Do Accuphase Class A amps operate purely in A or do they move into AB when more watts are required?
They do.
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  #20  
Old 02-25-2022, 10:03 AM
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Quote:
Originally Posted by meltemi View Post
Sorry, but nope. On the datasheet, https://www.accuphase.com/cat/e-650_e.pdf, power is specified (and guaranteed) for 1-ohm , 2-ohm, 4-ohm and 8-ohm loads.
Under normal operating conditions you will not have to fear any power restrictions due to thermal limitations.

Martin
My previous post confirmed that their power output doubles as the load impedance halves, and I did not question the power output they guarantee. I only pointed out that operation is only specified as being in 'Class A' for the rated power into 8 ohms and you can see that in their specs as the ratings into lower impedances are not designated as 'Class A'. The class of operation goes into AB into impedances lower than 8 ohms at the rated power levels.
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