Thanks, I skip on this one, but then I need your advise once more. I now have settled on my rectifiers for my amp: WE422a and Mullard GZ37 (Big Botlle). I have tried the WE422a in my DAC but for some reason, it does not quite work there as well as in my amplifier. The WE 422a has the most spacious, detailed and coherent sound of all rectifiers I know. The Mullard GZ37 (big bottle) is to me a bass monster, deep, fast, defined and dynamic., and no slouch on the rest, but clearly not in the WE422a league.
Now I have to settle on the rectifier in my Dac (lampizator Dac 4 gen. 4). I have tried: Amperex buggle boy GZ34 (black base); Sophia Electric 274b (mesh plate); and RCA 5R4gy (1944, dark brown base), and some other cheaper ones.
The GZ34 is good for rock ‘n roll. It is clear, and dynamic, Good bass but in my dac a bit dry and that does not suit classical music well.
Sophia 274b mesh; barely fits in my dac. I completely agree with your description here. I like its soundstage, air, tone (timbre of instruments), dynamics and forward vocals. But, with the Fostex TH900, the mid bass hump spoils it a bit, especially because it is not well defined in my DAC.
RCA 5R4Gy (1944 dark brown base). Impressive soundstage, very airy and detailed (more so than the Sophia 274B mesh). For instance, best off all three in separating the different string sections of the orchestra. The problem I have with this one is that although your hear all the different instruments very clearly, it is not coherent. The Western Electric 422a is equally detailed but also coherent. In my opinion the RCA lacks that capability in my dac. Furthermore, it is a little too bas light and sharp, it lacks a bit of tone so to speak.
Normally, I would go for the GEC U52, but that one does not fit in my dac (at least the Mullard GZ37 big bottle does not fit, and I think these are equal in size to the GEC, correct?).Generally, I am searching for something with a detailed and coherent midrange that has the soundstage of the Sophia or RCA, the tone, dynamics and air of the Sophia, and the bass of the GZ34.
I am using it in my dac, so current is not a problem…What would you advise me.. Personally, I am thinking of buying either the Brimar 5R4gy, or the Mullard GZ32, but maybe there are others that I overlook. How do the Brimar and Mullard GZ32 compare in terms of midrange detail, coherency, soundstage, air, dynamics, and bass. Hope you can give me some direction. Thanks.
UPDATE: I have found a way to fit the bigger rectifiers in my DAC. I just needed to replace the first cap a little bit (was easy). I ordered a NOS 1951 black base GEC tube for decent money. Its now on its way. Lets hope they rightly earned their reputation.
I agree with everything you said, your descriptions of the tubes fit mine exactly. The fat bottle gz37 is very nice, tons of bass yet refined, but not we422a territory. (It does everything alot better than cheaper bassy rectifiers though).
And i also did not like the rca 5r4gy that much, huge soundstage but not coherent and seemed too treble happy for my tastes. The dark brown base is also the best version of that 5r4gy. I still dont think its as detailed as we422a, or rather the 422a is more layered, transparent, euphonic, and presents the air in a more refined manner, its really beautiful sounding and presents music in a very vivid way.
Seems like if you can get the U52, that would be the best choice, its not as big as the fat bottle gz37. Also the next best would be the mullard gz32/cv 593 available from upscale audio or ebay. Similar sound, great british sound of the u52, its pretty much a baby u52 any way you look at it. I really think its an underrated tube.
If you do get the U52 to work, its almost as good as 422a if not as good
Edited by Dubstep Girl - 2/21/14 at 5:33pm