Why do the 540A and 640A only allow for Speaker B to be switched in and out whereas the 840A can switch A and B Speakers in and out?

As with many aspects of amp construction there is a fine balance of quality versus economy in the design. The 540 and 640A have their output stage directly coupled to the Speaker A terminals with the Speaker B Terminals engaged or disengaged on demand. The 840A has a more sophisticated output stage by virtue of the greater resources that we have to build it. This allows for the output to be switched seperately to any combination of A and B speaker outputs.

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