Want more current for lower Z loads? Parallel the output tubes or use some bigger ones.
6N6=25 or 30ma/triode but 6AS7=125ma/ triode. No brainer and they look cool. You could probably drive a tweeter with it.
Big fan of regulated DC. Quiet, locks the soundstage in and tighter bass. DC filaments, of course.
The output cap should be rated for the full DC supply. Use a 250 volt here to avoid smoking your cans in case of a tube short.
There are some large value film caps that would work here really well. Check Mouser or Digi.
Not cheap but clean.
You can do without the input cap. Offsets of DACs are in the mv range. Less caps = more music. Unless see below.
I would not bother to lower the 6N1 input grid leak R. If you drop the cap the volume control will be your grid resistor. Could be a problem if the 6N1 draws grid current but shouldn't unless it is a bit gassy. If it does it will sound like you have a bad volume control. The DC in the pot will make noise when you twist the pot.
The Z of the headphones will determine the LF rolloff. No NFB so no worries with pole points being too close.
Just some suggestions.
Good luck.
6N6=25 or 30ma/triode but 6AS7=125ma/ triode. No brainer and they look cool. You could probably drive a tweeter with it.
Big fan of regulated DC. Quiet, locks the soundstage in and tighter bass. DC filaments, of course.
The output cap should be rated for the full DC supply. Use a 250 volt here to avoid smoking your cans in case of a tube short.
There are some large value film caps that would work here really well. Check Mouser or Digi.
Not cheap but clean.
You can do without the input cap. Offsets of DACs are in the mv range. Less caps = more music. Unless see below.
I would not bother to lower the 6N1 input grid leak R. If you drop the cap the volume control will be your grid resistor. Could be a problem if the 6N1 draws grid current but shouldn't unless it is a bit gassy. If it does it will sound like you have a bad volume control. The DC in the pot will make noise when you twist the pot.
The Z of the headphones will determine the LF rolloff. No NFB so no worries with pole points being too close.
Just some suggestions.
Good luck.
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