Because it's cool !
There are some equipped with a tube buffer .
I've read that the LM3886 does perform good with a 10/20 K pot at its input .
Not the same as for the LM3875 .
Of course I would bypass the IC buffer stage in that kit .
And I would start with a separate PSU for the tube one
I was ironic BTW
If you put something more in a kit ,I'm sure the goal is to 'catch pigeons' .
That buffer could be anything ...who knows...a DSP correction
and someone may think that a 'buffer' may be a plus . But it only guarantees a high impedance load to the device attached .
Reading the 3886 DS it is clear that it was projected to have an 'high acceptance' input ,thus not needing any buffer . Some people have reported that using vacuum tube for that duty is much better .
If you put something more in a kit ,I'm sure the goal is to 'catch pigeons' .
That buffer could be anything ...who knows...a DSP correction
and someone may think that a 'buffer' may be a plus . But it only guarantees a high impedance load to the device attached .
Reading the 3886 DS it is clear that it was projected to have an 'high acceptance' input ,thus not needing any buffer . Some people have reported that using vacuum tube for that duty is much better .
Sorry I dond have any PCB designs as your requirement right now. If I can manage to get that, I will definitely post it for you.
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