Mastersound 300b Compact-thoughts???

Don't own one but the tube compliment doesn't include a rectifier - : 2 x 300 B - 2 x ECC802 - 2 x 6SN7 

Robert, reach out to member @audiothesis He used to carry Mastersound as a dealer. All the best.

It is solid state rectified.

I know some people insist on vacuum tube rectification, but in this case it makes little difference unless you are looking for an unreliable mushy sounding amp.

The Compact 300B is definitely neither of those. Highly reliable, dead quiet, and very very good sound quality.

SS rectification can sound good or bad like all things it depends on the implementation. I had a great tube rectified amp I now own a great SS rectified amp. I have not heard the Mastersound 300B however.

it got good reviews a decade ago. But at 12 watts what are you going to be powering? I love my 300B Woo amp with a lot of current powering my headphones.   But you need very efficient speakers and the right sized room. Then it could be a great choice.