Aroc,
You have received incorrect info. No matter which tap you use, the full primary of the output transformer is used, and on the secondary, the HIGHER the tap impedance, the MORE of the winding is used (for example, on an winding with 4, 8 & 16 ohm taps, the 4 ohm tap is the CENTER TAP).
Another thing--according to the Dynaco ST-70 manual, running an 8 ohm speaker on a four ohm tap reduces power, but "the operating conditions are shifted from maximum power output to minimum distortion."
And, yes, the damping factor will be higher from the lower tap. The great thing is that it costs nothing to find out which way sounds better, and will not damage your amp (if you turn off the amp before playing with the wiring). Luceeeee, you got some listening to do!
BTW, I am the designer of a tube power amp, and have been an electronic technician for over 30 years.
You have received incorrect info. No matter which tap you use, the full primary of the output transformer is used, and on the secondary, the HIGHER the tap impedance, the MORE of the winding is used (for example, on an winding with 4, 8 & 16 ohm taps, the 4 ohm tap is the CENTER TAP).
Another thing--according to the Dynaco ST-70 manual, running an 8 ohm speaker on a four ohm tap reduces power, but "the operating conditions are shifted from maximum power output to minimum distortion."
And, yes, the damping factor will be higher from the lower tap. The great thing is that it costs nothing to find out which way sounds better, and will not damage your amp (if you turn off the amp before playing with the wiring). Luceeeee, you got some listening to do!
BTW, I am the designer of a tube power amp, and have been an electronic technician for over 30 years.