I have owned the Darkvoice 336SE for a while now, and consider myself a discerning listener/audiophile. My listening setup consists of two KRK RP-5 studio reference monitors, and a KRK RP-10S, and for private listening I use a pair of Sennheiser HD 650 cans.   I purchased the Darkvoice 336SE through Amazon, and it arrived from the seller in perfect condition. I had better tubes on the way, but I decided to try the stock tubes. Well, they weren't bad (as bad can be) but they weren't very good either. I replaced them with a NOS RCA 6AS7G and a new...

I have had this amp now for about 6 months, and I very much enjoy the sound. I didn't even bother with the stock tubes, they got tossed in favor of a matched pair of GE 5654's, and I have a matched pair of Voshkod 6ZH1P-EV tubes held in reserve. I tried them, but they were brighter than the GE's, so I went back to the GE's. I didn't dislike the Voshkod tubes, but I wanted something a bit warmer. I use them with a pair of Sennheiser HD-650 phones. Setting the jumpers for the correct impedance was simple enough.   It has an excellent sound stage...