2SD1782K _ is there a not smd equivalent ?

[ginetto61]

Thanks again ! well the design goals are quite clear To provide 2Vrms on lets say a 1kohm/200pF load with low THD
The test load should cover almost all power amps around
To be honest i have never fully understood why such a big part of the gain has been charged of the power amps really
I have seen measurements of line stages and they are able to provide up to 20V with very low THD and noise even on 600 ohm loads
I would love to see a 10Vrms for a power amp sensitivity Like what is called a power buffer
Maybe there are reasons i am missing

 

[Mooly]

well the design goals are quite clear To provide 2Vrms on lets say a 1kohm/200pF load with low THD

Good start. You now have to decide what the input range is going to be. If it is a line input from a CD player for example then be aware that some discs can be mastered at at quite a low level (I have a few like that) and you sometimes need a bit of gain.

1k/200pF is a good target range 👍

To be honest i have never fully understood why such a big part of the gain has been charged of the power amps really

You need the gain somewhere in the chain and there is a subjective point of view that lower feedback designs for power amps can actually sound better than designs with lots of feedback. More feedback usually means lower voltage gain.

I would love to see a 10Vrms for a power amp sensitivity Like what is called a power buffer

Easily done but as a commercial product it would have very limited appeal.

Have a look at the ACA amp on these forums. This is a bjt version I put together using common transistors and it has a very low voltage gain but it sounds terrific.