The sound is definitely different with kt150 and 6550. Which one you prefer,I do not know. Each one has his personal preference.
I use two power amplifier exchangeable 2-3 days, and I feel good, and taste the difference.
KT150 to KT120..or KT120 to KT150
Has anyone here gone from using KT120's in their amp to KT150's and preferred the KT150 tube...conversely has anyone gone from KT150's in their amp to KT120's and preferred the KT120's?
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-------------------------------------------------------------- @ozzy for what its worth to you, while my purpose built mono block tube amps were designed specifically to run KT150s, nice, clear, pure, I am back to running KT120s again, now. Kinda missed the more textured (older) midrange, so I’ve alternated a few times. 150s are extra detailed on top, slightly larger and deeper sound stage if bias is turned up, but is the grass greener, maybe. The 150s can be so linear sometimes on my system, i miss that littlest of the midrange bulge reminiscent of EL34s, KT77s and maybe even KT88s. Popped the 120s back in, and there it is. Back and forth enough times now to know for sure in my setup. Been playing again with bias on both 120s and 150s past six months. On my amps both tubes at 60ma are brighter. My ears are sensitive to bright sound. After 100-200hrs+ on both KT150s or KT120s, I decided on backing the bias down to 40-45ma per tube for low volume listening. Normally at 50ma. Just for grins, now sitting at 40ma with KT120s, lowest I’ll go. #1) saves the tubes a little longer, #2) takes a little of top edge off with bad recordings, and sounds nice. No fatigue at all. Save the $, keep enjoying those KT120s! I have zero desire to put the KT150s back in, and not for a good while. Like them enough that I had a spare quad set of KT120s stored too. | |
@jerryg123 are you running your KT170s in amps with proper transformers and plate voltage ability to take advantage of the extra 15 watts capability these tubes have over the KT150s? What "attributes" are you hearing differently from KT150s - if you can share more, thanks. | |
@decooney Yes Qualiton X200 by Audio Hungary. Each of these tubes has their own sound characteristics. KT 120 is a great all around tube for all types of music. KT170 and 150 I like for Jazz, Rock, Blues, really like the sound stage and upper end. KT88 I really enjoy with classical it is fuller sounding than the 120's
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