Solude
Headphoneus Supremus
Most receivers have opamp headphone sections, no buffers, no discrete output, just whatever TI is selling as a headphone opamp at the time. W4S mINT made a big deal out of it and all I could think is... why oh why are you trying to 'sell' people on the wonders of a $2 chip in a $1500 product? Problem with the vintage ones is they are just the speaker taps with massive inline resistors that drive down the power while jacking up the output impedance. Read huge changes to the freq resp and poor control.