Favorite 300B: Sophia vs KR

Charles1dad,

what driver tubes are you using?

Thanks

Antigrunge,
My amplifier came with General Electric 6EM7 1950s vintage.

Ok, thanks

In my Wavac EC300B on WE437 and Tungsol KT66s into Duevel Bella Luna omnis the Takatsukis are by far the best in microdynamics, soundstage depth and overall neutrality. The EATs are more ballsy but less subtle, if one listens to rock music predominantly, one might actually rate them more punchy and ahead. But on classical and jazz (solo piano anyone?) the Takatsukis are eerily quiet and balanced with lots more air around individual instruments. The EATs are about 18 months old, the Takatsukis are about 6 months old. I have not tried the Royal Princesses.

Antigrunge,
Excellent question; and even though this thread is about 300b tubes, the small tubes and their influence on power tubes should probably be addressed. Like Charles1dad, all my small tubes are old, scarce and expensive. But if you’re contemplating any of these very expensive 300bs, please spend the requisite time and energy and yes...money on the small tubes to get the best out of these very expensive 300b tubes. You wouldn’t put run of the mill tires on a Bugatti.

Phaelon,
You `re so right. My amp`s builder Israel Blume says the driver tube selection is critical to the output tube`s performance.He picked the 6EM7 specifically for it`s high current drive capacity(this driver tube can put out 2 watts of power on it`s own per Israel).