Alan, just curious to see how the P801 stacks up to Purifi's reference amp (older 1ET400A module but using the OPA1612 opamp in their buffer board) as...

Alan March wrote: Sure will do low frequency. Already promised for @SmartOne_2000 Let's just leave the ASR subject. It's just the negative and nasty...

Alan March wrote: And why just 2 volts output? Rather arbitrary. For a 9040 with the usual ASR testing at 5 watts, it needs 4.475v applied to the l...

Alan March wrote: The LM is a great part but has issues with RFI susceptibility. 1612 is lower noise and distortion. It's the topology, pcb layout an...

Looking casually at the LMExxxxx and OPA1612 opamps datasheets, they have their lowest distortion at 10 or more volts into a 2K load, just before clip...

Alan March wrote: Well it's only the slew rate we have specified at 100k load. No idea what it is for the rest of the measurements. It is critical t...

Alan March wrote: Its not bad :). Still, no load was mentioned, probably open circuit improving performance. Remember a 9040 module input impedance ...

Also, is a dual mono version P802 in the works? Maybe with two AC power inlets?

Alan March wrote: Yeah, not that simple depends on layout also. RF doesn't just come in through the signal cable. The buffer is sat in a hostile RF ...

He has RF filters on his inputs, if you look at the circuit topology tab. My main impression were the IMD and noise floor plots, which look impressive...

Curious to find out how the Neurochrome buffer compares to your Ultra buffer...

Alan March wrote: @SmartOne_2000 I have very quickly thrown a P482 (Purifi 1ET6525SA) on the bench and performed some tests to demonstrate the things...

I think the difference in the graphs is due to the measurement bandwidth. One is made with 45kHz bandwidth, while Purifi has a 20kHz filter. Do you se...

Alan March wrote: @SmartOne_2000 Being rather bleary-eyed this morning, I have realised that I misread the frequencies against the colours on the gr...

BTW, much respect for your video here(y)!