Originally Posted by jcx
while according to the Tube Cad articles the name SRPP is a recent invention - with ambiguous interpertations - I don't think it can be stretched to cover the present circuit
you have "feedforward" push-pull - the bias/pull down current is modulated by the amplified signal V, scaled by a R and current mirror
there is no connection to the load current demand - it could be helpful if it "lined up" with the load demand - but with ES headphones being a fair capacitor it doesn't happen here
I agree, while I was testing the output wave form, I found out even though this circuit has overall flatter FR, but I also tried loading the upper two transistors with resistors or CCS load. and resistor load clips very clean and smooth, sounds like a triode, CCS is a little harsh when clipping, while this SRPP thing clips very harsh. I will try to play with higher idle current once I received the heat sinks I ordered a while ago.
I think a CCS loaded emitter follower can do what you were describing here. emitter follower makes sure the voltage is right and CCS is making sure the current is there when demanded by the C load, especially when output voltage is at max, when current is 0 or when voltage is at 0 and output current is at max.
Edited by wdiabc - 4/13/13 at 10:01am