These tubes replaced reissue Mullard El34's....WOW is all I can say. Before purchasing the tubes I could not find a good review of these tubes. I have a Cayin A100t. It requires 8 power tubes. Right out of the box the difference was like turning on a light switch. The tubes are really clear, detailed, with incredible bass and with a great presentation across the soundstage. Don't forget it is still sweet in the mids. Louis Armstrong's trumpet can sound very harsh through a lot of solid state configurations, but not with this tube. This tube complemented my preamp section with all NOS Black Plate RCAs. This is an amazing tube. I am overjoyed.

Rating: [5 of 5 Stars!]