Originally Posted by WittyzTH
takezo, I'm curious about your tube adapter for 6SN7. Does it need any modification to use that type of tube?
and how the tube affect the sound?
no and yes... no for the wa6 but yes for the wa6SE...
for the wa6SE you need to lower the voltage to the
anode and adjust the heater voltage to 6.3 as i've
found it's higher than that when the 6sn7 is used.
don't ask me why. the current should adjust to .6A
which allows for use of low impedance phones too.
without the resistors to make the changes the
current is lower than what's needed to make use of
low impedance phones... i'm still tweaking the values
of resistors in the adaptor to find a sweet spot for
on the other hand, i've found the 6dj8 and it's derivatives
more to my liking than the 6sn7 for the music i listen to.
to 6sn7 is super linear and offensive to no one's listening
palate but the 6dj8 has a beautiful coloured tone that
is addictive. it also needs the anode plate voltage to be
lowered to around 130v for the 6dj8 and 150v for the
6922 and 7308 to function a long time. it'll work fine at
200v on the wa6SE without any resistor adjustments
but i'm sure it'll lead towards an early grave for the tube.
but my favorite these days has to be the 6cs7. it requires
a simple adapter and works fine at 200+ volts. the tone
is as sweet as 6922 but with an even more intimate texture,
soundstage and timbre, especially for acoustic instruments.
acoustic guitar, violin and piano sound great with the 6cs7.
it's cheap at $4 a piece too, whereas the 6dj8 and it's sisters
are $10 and up per piece... as much as $50+ for the 7308
gold pin amperexes.