I posted this on an Oz forum but they all appear to be asleep down here so I thought I'd try Head-Fi. It's a sort of DaVinci Code mystery, electronics style:
which is almost certainly based on the same circuit as Onkyo use in their upmarket integrateds and receivers (5532 op amp, BD139/140 transistors, 2200uf power caps), which is discussed here:
http://www.head-fi.org/forum/thread/...s-onkyo-a-9555
and favourably compared to a well-respected $800 dedicated HP amp. Why am I interested in this? Because I own an Onkyo 9555 integrated which uses this circuit and I'd like to know more about it--plus it would appear to be something of a real bargain if published impressions are any guide. It certainly sounds the business through the Audeze LCD-2, but I just wondered if anyone had bought one of the Ebay amps and if so what they thought. If not, maybe someone would like to invest $50 and let us all know.
http://cgi.ebay.com.au/NE5532op-amp-Power-tube-HIFI-Headphone-Amplifier-/320668221495?pt=LH_DefaultDomain_0&hash=item4aa950c037I'm looking for more info on this little amp:
http://rockgrotto.proboards.com/inde...nt&thread=6013
It's the same amp as is discussed here:
which is almost certainly based on the same circuit as Onkyo use in their upmarket integrateds and receivers (5532 op amp, BD139/140 transistors, 2200uf power caps), which is discussed here:
http://www.head-fi.org/forum/thread/...s-onkyo-a-9555
and favourably compared to a well-respected $800 dedicated HP amp. Why am I interested in this? Because I own an Onkyo 9555 integrated which uses this circuit and I'd like to know more about it--plus it would appear to be something of a real bargain if published impressions are any guide. It certainly sounds the business through the Audeze LCD-2, but I just wondered if anyone had bought one of the Ebay amps and if so what they thought. If not, maybe someone would like to invest $50 and let us all know.
Here's the circuit for the separate HP amp in the Onkyo 9555:
Edited by pp312 - 5/4/11 at 7:23pm
