They are. Do you like turning it up to 11?
I wouldn’t go as low as 10w but anything north of 15w will give you 97dB of max volume 10’ from the speaker in a normal room. 30w, will deliver 100dB of volume. if you like it really loud, then the NAT is the way to go.
if you are looking for more nuance. KR Tubes delivers a level of Nuance and detail that is spectacular. I sell KR tubes as upgrades for my amps and they are as good as you would hope at the prices they charge.
I have access to KR Amps given my relationship on tubes and like I said, they are great. If 100dB is enough output for you, then it comes down to sound profile. You will not be disappointed in a KR Amp. I can’t say if it is better or worse than the NAT but KRs are better than most and are worth the price.
Both of these tubes are great at delivering a big soundstage without a particular emphasis on any one frequency range. They won’t deliver that lush midrange that a lot of lower powered amps are known for.
Have you listened to this type of tube vs say a 300B XLS or a 520B? They deliver a bit more power than a straight 300B but have the lush midrange that some many kwant when you think of lower powered amps.
