I am not really sure if it is the tweeter to be blamed. even with the TSM MMes getting the amp (SS/Tube) right is necessary..Regarding the so called brightness, I would really put that to the transparency of the speaker ..with no rolloff. what you hear is what the amp is giving as output :)
With my leben using the stock Sovtek 6L6GCs the highs were kind of hard and sharp. with the Winged C's and the Russian Reflecter equivalents they are smooth and extended
With my leben using the stock Sovtek 6L6GCs the highs were kind of hard and sharp. with the Winged C's and the Russian Reflecter equivalents they are smooth and extended