I'm not sure how efficient your Thiels are (I don't think THiels are usually all that efficient), and efficiency makes all the difference. For some speakers, 50watts is two or three times more than they could ever use...for others, it's only 1/10th of what they need. Ask Thiel what the power requirements are for your speakers and ask if they recommend any particular types of amps. As far as wattage and amperage goes, a 50watt tube amp should sound more powerful than a 50watt SS amp (someone else can explain "why", because I'm not electrically inclined). Volume isn't always the issue with wattage, because wattage and volume aren't a one to one ratio. I believe it's a ten to one ratio, so you need to have a 500 watt amp to be able to play twice as loud as a 50 watt amp (everything else being equal).
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