Are mono tube amps my best choice?

Even at a sensitivity of 93.5db(2.83V), I wouldn't bother with a 9wpc amp(or pair) for viewing movies with your speakers. There just couldn't be enough bass drive for any realism. You never mentioned what listening levels you enjoy(BTW). Yes- It's true that tube amps seem more powerful than SS, for a given power rating. Whether this is because they clip more gracefully(no square waves or high, odd order distortion), or have more reserve Joules(do to the higher operating voltages)in the power supply, isn't really fully understood. Something you might consider though: Using tubes for your mids/highs, and a pair of your existing amps for the bottom end. You're using two attenuators anyway. Are they stereo? If so- You could try that with Min's SET(though I'd still recommend something around 60wpc).

I think the person you should be asking is the designer of the speakers and not a tube designer you have taken a liking too. I would ask Alan Yun at Silverline what he thinks. Personally, I think 9 watts driving Dynaudio drivers is way to little.

Thank you for your input.

I emailed Alan at Silverline, and am waiting for his response, which I will post as soon as he replies.

Thank you, Kevin

Do you want to run tubes on the entire speaker or keep the B&K's for the bass modules and tubes on the mid and high frequencies?

1) More important than a speaker's sensitivity rating is its impedance & phase curves.

2) IF the speaker is an easy load - and Silverline supposedly makes speakers that are - a 9W SET could well be a very good match at 93.5 dB/W.

Let's do some quick, basic math here. 93.5 dB/W at 8 ohms gives you 93.5 dB for one watt pulled at one meter. The second speaker gives you another 3 dB. Your listening distance - say 3m - costs you about 10 dB. You're now at about 86.5 dB for one watt. However - that's anechoic. Even in a large room you're going to get *at least* 3 dB of room gain. So, you're at 90 dB now for that one watt - 90 dB is loud. How loud do you want your movies? Well, even if you want peaks of around 100 dB, which is really freaking load, this setup can probably do it.

When I had 90 dB/W Hyperion speakers, a 16W 211 SET amp was able to play them louder, with much better bass dynamics, than a 200W solid-state monoblock.

SET amps, being class A, have very robust power supplies. An amps continuous wattage rating is meaningless if the power supply can't produce the current needed. Furthermore, and this is where it does get a little weird, there is some evidence that a single-ended valve amps can swing, for brief periods, way more voltage than their power rating would imply.

So, you might want to give it a try. However, a 300B does not have the current capabilities of the transmitter triodes.

Lastly, Min's a great guy, builds great equipment at great prices, and just might love the idea of building you a pair of 211 or 845 SETs. :)