Originally Posted by takezo
latest update with the modded wa-6 at 250+ hours:
the soundstage has finally opened up significantly...width, depth, height and 3-d effect is alive and well...sound seems to emanate from outside of the headphone, front, sides, up and back... the mids are so smooth, voluptuous and sweet...the presence, tone and decay is quite impressive.
! I have about 450 hours on my modded WA6 now, and I am getting the same 3-D effect with my HD-650's, with sound extending well outside the headphones. And yes, the mids are perfect! Bass continues to improve, but still varies a little bit from day to day.
Most of the first 400 hours of burn-in were done with interstation white noise, but I have my doubts that this is the best method, as it seems that it has gotten even better (at a faster rate) in the last 50 hours of playing actual music.
One thing I have noticed with this Amp, is that it is very easy to discern differences between Rectifiers. Have tried Mullard GZ34, Mullard GZ32, Amperex Brown Base GZ34, etc. All sound very good, all sound slightly different, but if you want to hear this amp at it's best, you've got to use a Holland made GZ34 Metal Base. AMAZING! Simply blows any of the other tubes away! If I knew earlier what I know now, I would have saved all the money I spent (wasted) on the other tubes and just bought the Metal Base to begin with.
The GZ34 Metal Base Rectifier transforms the modded WA6 into something very special!