Technically, the 4 Ohms tap should be better suited. But just chose the tap that sounds best to you. Chances are that it would be the 4 Ohms tap, too, since it would give a somewhat better damping factor (and a bit less output power, but you won´t notice that by ear w/o measuring the actual Po).
Tom
You don't mention in what mode your OP tubes are connected and this makes a difference, as I'll try to explain below:
* With triodes or triode-strapped beam tetrodes/pentodes, it's better to err on the side of a higher impedance than a lower impedance, so use the 4 ohm tap with a 6 ohm speaker.
* In tetrode/pentode mode, the opposite is true, i.e. it's better to load them with a lower impedance, by using the 8 ohm tap with a 6 ohm speaker.
* For ultralinear connection, there is more leeway and it probably doesn't really matter which tap you use. However, in general with UL, using a higher load impedance (the 4 ohm tap) will give less power and less distortion, while using a lower impedance (the 8 ohm tap) will have the opposite effect.
The above is just a general guideline and what works best for you may depend very much on your actual speakers. As you're probably aware, the nominal impedance of a speaker is an average that sometimes doesn't mean too much; the actual impedance can vary all over the place with frequency, depending on speaker design.
* With triodes or triode-strapped beam tetrodes/pentodes, it's better to err on the side of a higher impedance than a lower impedance, so use the 4 ohm tap with a 6 ohm speaker.
* In tetrode/pentode mode, the opposite is true, i.e. it's better to load them with a lower impedance, by using the 8 ohm tap with a 6 ohm speaker.
* For ultralinear connection, there is more leeway and it probably doesn't really matter which tap you use. However, in general with UL, using a higher load impedance (the 4 ohm tap) will give less power and less distortion, while using a lower impedance (the 8 ohm tap) will have the opposite effect.
The above is just a general guideline and what works best for you may depend very much on your actual speakers. As you're probably aware, the nominal impedance of a speaker is an average that sometimes doesn't mean too much; the actual impedance can vary all over the place with frequency, depending on speaker design.
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