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Which B&K ST-140?

OK, I simply have to hear what I'm missing--especially up high--with my old tube gear. After lots of reading on this wonderful website, the B&K ST-140 seems a good quality-vs-cost choice to try.

But which ST-140? The 70w? 105w? only the blue and red one? I only care about which sounds best, especially at the high end.

Thank you!
river251

Showing 2 responses by unsound

unsound
7,310 posts
 
The B&K ST 140 is not the best choice for low impedance speakers.

http://www.stereophile.com/content/bk-st-140-power-amplifier-1989-measurements
unsound
7,310 posts
 
River251, Speakers have minimal impedance and nominal impedance. One should know not only the impedance swing of a speaker, but also the phase angle before choosing amplification for a given speaker.
What is a low impedance? What is a high impedance? Well, I think that might be very subjective, and many here on Audiogon might have very differing opinions on both. IMHO, in the big picture 6-8 ohms is the middle ground, anything below 4 Ohms is low, and anything over 8 Ohms is high, but there are other important considerations, and speakers ultimately decide.
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