Tubes: KT-90 compared to KT-120 compared to KT-150

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Rehan Azim Hashmi

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Is the KT-120 a improvement over KT-90?
And is the KT-150 a improvement over KT-120?

If your amplifier can run these tubes then is KT-150 the automatic choice over the first two?
Any other power tube that is ideal for power amplifiers regarding sound quality and durability?

Any opinions or views or arguments put forward will be greatly appreciated.

Thanks!
 
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