Zaikesman, the output transformer for the Atmas-pheres you are referring to in your last post is maybe the zeroformer(?) which acts as a passive transformer and increases the turns ratio of the amp so the load from the speaker to the amp is optimally realized at 16 ohms.
The zeroformer, designed by Paul Speltz (Atmas-phere also markets or did market one) has several wires connecting to the autoformer that act as a multiplier. The multipliers are 1.37X, 2X, 4X, and 8X. As an example, an 4 ohm speaker would be set at the 4X setting to realize an ideal 16 ohm load. The downside is that the sound does tend to get a bit drier and more solid stateish. It works but does tend to affect the sound of the amp especially at the higher multipliers.
The zeroformer, designed by Paul Speltz (Atmas-phere also markets or did market one) has several wires connecting to the autoformer that act as a multiplier. The multipliers are 1.37X, 2X, 4X, and 8X. As an example, an 4 ohm speaker would be set at the 4X setting to realize an ideal 16 ohm load. The downside is that the sound does tend to get a bit drier and more solid stateish. It works but does tend to affect the sound of the amp especially at the higher multipliers.