Modulation of the power supplies is the issue here. Since almost nobody regulates the power supplies for the output section of their amplifiers, monoblocks will sound better for this reason alone. The result is greater authority, improved soundstage and a blacker background. BTW this has nothing to do with whether it is tube or solid state!
Stereo amplifiers can get around this problem by having separate power transformers and supplies for each channel. Then the only concern is proximity, which can be dealt with if wiring and layout concerns are addressed.
Stereo amplifiers can get around this problem by having separate power transformers and supplies for each channel. Then the only concern is proximity, which can be dealt with if wiring and layout concerns are addressed.