Noob Question - Onkyo A-9010 - what kind of topology?

[Klangwelt]

Just bought this amp and it sounds better than it should at this pricerange. Can anyone tell me what kind of topology this is? I'm a complete noob, and would appreciate some input. Apologies for the schematic, the screenshot from the service manual didn't work out well in terms of sizing.

Thanks!

 

[vzaichenko]

Just bought this amp and it sounds better than it should at this pricerange. Can anyone tell me what kind of topology this is? I'm a complete noob, and would appreciate some input. Apologies for the schematic, the screenshot from the service manual didn't work out well in terms of sizing.

Thanks!

Well, it's rather simple yet efficient.

CCSed long tail pair, feeding a balanced (mirrored) push-pull VAS with simple EF2 output stage, based on BJT Darlington pairs (Sanken) - good ones, by the way. Class AB operation.

 

[5th element]

So the VAS drives the Darlington outputs directly?

 

[vzaichenko]

So the VAS drives the Darlington outputs directly?

Well, at this kind of power level it's ok - those Darlingtons are equivalent of a good EF2 arrangement (beta is 5000 as a minimum).

 

[Klangwelt]

Well, it's rather simple yet efficient.

CCSed long tail pair, feeding a balanced (mirrored) push-pull VAS with simple EF2 output stage, based on BJT Darlington pairs (Sanken) - good ones, by the way. Class AB operation.

Thanks Valery - much appreciated! My next amp is the VHEX🙂 I bought this one on a whim since it was highly reviewed, fully intended to return it, actually since the hype...well, it rarely lives up to the hype🙂

 

[vzaichenko]

Thanks Valery - much appreciated! My next amp is the VHEX🙂 I bought this one on a whim since it was highly reviewed, fully intended to return it, actually since the hype...well, it rarely lives up to the hype🙂

Any time 😉
VHex - you're more than welcome. The one I can recommend with no hesitation.