As an alternative to the Harrison Labs attenuator the OP may want to consider Rothwell attenuators
+1 I have a couple of different values. I use them as needed.
help........
just purchased a conrad Johnson classic, with the m8080 tubes. man this thing is loud. I barely have it on 2 and can barely handle the loudness. what can I do. assoc equipment McCormack dna 500, oppo 203, alon IV, acc zen. is there another tube I can use to bring the volume down some... let me know, thanks. maybe the impedence is not right for these tow.