David Weinhart, (The AV Experts) an EAR retailer and friend of the distributor, Dan Meinwald, uses the SR purple fuse in his 912 which he has owned for over a decade. I recommend after using the blue in my 864 and purple in my 890, that you should try a purple fuse in your 868L and be surprised at the very significant improvement, especially in opening up the inner soundstage of instruments and voices (separating them) with more body, tighter bass and smoother highs. After just one hour, it was very good and only gets better (I’m not at 200-300 hours as recommended for full benefit, just 45 hours now). Probably obtain an amperage rating twice as high as a glass fuse. Dan Meinwald makes maximum recommendations.
Moderator-I am not associated with either the retailer or the distributor, although a customer of both.