8 ohm (3,2 min) But the diagram of the impedance shows different things.... ( http://www.kef-audio.de/Reviews/pdfs/Stereo/Reference_205_2_Stereo_04_07.pdf )
That amp has pretty low output impedance since there are 4 output tubes per channel. The 4 ohm taps are a definite but if you have 2 ohm as well (not sure if it has them), you may want to try them and see what you think.
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