Your list will grow exponentially if you add components which are not fully differential. Some refer to this as "truly" balanced, meaning identical circuit topology for the + and - legs of both left and right channels.
Many other manufacturers are using single ended topology, but offer balanced connectors. Some are simply adapters built into the chassis, some use transformers to convert the balanced signal to single ended.
Single Ended Triode amps certainly do have quite a following. The reason that manufacturers designs vary is because no one single design has been proven to be superior.
I have owned good and bad components that were single ended and balanced designs.
Just as there is no "consensus" answer for the planar or dynamic speaker design, tube or solid state amplification design, digital or analog source design, there is also no consensus answer for the single ended or balanced design.
Many other manufacturers are using single ended topology, but offer balanced connectors. Some are simply adapters built into the chassis, some use transformers to convert the balanced signal to single ended.
Single Ended Triode amps certainly do have quite a following. The reason that manufacturers designs vary is because no one single design has been proven to be superior.
I have owned good and bad components that were single ended and balanced designs.
Just as there is no "consensus" answer for the planar or dynamic speaker design, tube or solid state amplification design, digital or analog source design, there is also no consensus answer for the single ended or balanced design.