0 Members and 1 Guest are viewing this topic. Read 7574 times.
I received my ultra 4 se last week and see there is a provision for using two differnt types of tubes 12sn7's or 6sn7's Can anyone tell me the sonic differences between these tubes?ThanksmikeProud Owner
Quote from: topround on 4 Oct 2006, 07:27 pmI received my ultra 4 se last week and see there is a provision for using two differnt types of tubes 12sn7's or 6sn7's Can anyone tell me the sonic differences between these tubes?ThanksmikeProud OwnerI have owned the 2a se for a couple of months now and I already had plenty of 6sn7 tubes since I have owned octal preamps for a while now. The tubes I received with the 2a were the RCA 12sn7gt which have a nice tonal balance and I like them for Jazz. However, as was the case with the RCA 6sn7gt also, when listening to classical, the massed strings are not as smooth as other tubes I have. There is a slight upper midrange etchiness with the RCA tubes, IMO. Tung-SOL tall bottle 6sn7GTB are nice underrated tubes, not lacking much from top to bottom. I also like the sylvania 6sn7GTA chrome domes from the 50's with my MAD pre. The syl tubes from this era have superb airy treble but depending on your system can cause more sibilance. The RCA 12sx7 tubes were OK, similar to the 12sn7gt but a little too laid back/dark for my system. The ones I like best for the 2A SE are the Hitachi 12sn7 gt. I am surprised by this tube, really big, open sound, smooth, punchy bass and just more involving than others that I have tried. Yes, they are forward sounding but are perfect for my vandersteens and they are not harsh by any means. I also found that the RCA 6x5 is not the best rectifier, I tried several. The syl 6x5gt bottom getter with plates staggered vertically made the sound brighter but otherwise ok. The smoothest and best one was the sylvania 6x5wgt, brown base, top getter with a large area of flashing on top. Hope this helps.Darius