@david_ten The following paragraph precedes that amplifier list and this what was stated one time as referenced in the Mono & Stereo review of the Nenuphar:
Magus are dedicated for rooms of 12 - 25 square meters. They are a perfect match for a tube amp with at least 3 Watts per channel. Our personal preference is somewhere around 2A3, Px4, 45 tube-based amps. Nonetheless, most solid-state amps (especially those working in A-class) are also an amazing match for the Bliss C. When it comes to placement, they can be placed both forward and placed right against the back wall. They like about 5-10 degrees of toe-in.
“Our preference” is the distinction I picked up on and 300b amps were not included.
@realworldaudio That was an excellent summary and I find your speaker cable mod (single run for the positive and five runs of speak cable for the negative) very interesting.