PhilDick
pfm Member
I asked a question about this in the 'all amps sound the same' thread but it was a bit off topic. However I would like to hear from our techies about this.
I have just acquired an Arcam a49 and to me it sounds fabulous.
Now Arcam claim that this amp and others run in class A up to 50 watts. however, looking further into this they state:
"The A49’s output stage includes a proprietary error correction circuit that modulates the modest standing currents in the output stage and ensures a near-constant output impedance for peak currents of up to about +/- 4 amps, corresponding to well over 50W in to 8 ohms. The A49 thus behaves exactly like a classical class A amplifier up to this power level in terms of performance but without the heat penalty"
How much of this is actually true - does it really behave like a Class A amp? it doesn't get hot!
Arcam's doc:
https://www.arcam.co.uk/ugc/tor/p49/Technical Notes/The_technologies_behind_the_A49_101014_A.pdf
I have just acquired an Arcam a49 and to me it sounds fabulous.
Now Arcam claim that this amp and others run in class A up to 50 watts. however, looking further into this they state:
"The A49’s output stage includes a proprietary error correction circuit that modulates the modest standing currents in the output stage and ensures a near-constant output impedance for peak currents of up to about +/- 4 amps, corresponding to well over 50W in to 8 ohms. The A49 thus behaves exactly like a classical class A amplifier up to this power level in terms of performance but without the heat penalty"
How much of this is actually true - does it really behave like a Class A amp? it doesn't get hot!
Arcam's doc:
https://www.arcam.co.uk/ugc/tor/p49/Technical Notes/The_technologies_behind_the_A49_101014_A.pdf