I would tend to agree that for a more linear presentation, the 6C33 has serious advantages. The best solution if power is a concern, is to move towards a ultralinear or push-pull KT-88 6550 amp. You do sacrifice some midrange intimacy but most else is better. I think that the belief that any amp under 6 watts per channel or so can drive any speaker properly is mistaken. Again in all designs the transformers are critical.
