Has Auto bias that has been calibrated by Ralph at Atma-Sphere Open and relaxed sounding. Does not have the dry top end of an Ayon. A direct input allows the owner to use this as an amplifier only with the preamp of your choice. The small signal tubes are: 12AU7 (2) and 5687s (2) with 2 32B power tubes. If you want to use 300B you will need to get this unit rebiased.
300BXLS and other higher power 300B derivatives will also work and are available new from KR and Emission Labs. I think that the 32B offers you the best of both worlds. You get significantly more dynamics with better bass, but little to none of the organic midrange magic is lost.In my opinion, the 32B is superior to the 300B in every aspect. It was stored in a temperature controlled space for over a decade. The 32B tubes were new (never used) in original box when I bought the amp. You will notice that the chrome seems to have degraded with some scratches in the front and some imperfections under the chrome- the scratches were the result of my attempt to polish the top. But none of this affects the amazing sound and build quality Almost like pitting under the surface. All other aspects of this unit are very good to excellent. The item "VAIC Mastersound 32B tubed integrated amp" is in sale since Wednesday, May 8, 2019. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "drandleman" and is located in Moline, Illinois. This item can be shipped to United States.