Incredible tube, one of the best! I bought it based on the famous Dubstep Girls 5U4G recommendation. Used in my Woo Audio WA6, which is also for sale...magic!!!
Reads as follows:
British tube made by GEC/MWT/Marconi/Osram, etc. I've also seen it branded under Mullard or Brimar. It should be compatible with most 5U4G amps (I have confirmed compatible with Woo WA22 and Stratus). Mine has grey plates but I've also seen black plates as well as black base versions of this tube. Compared to the Western Electric 422A, I think this would be the second best rectifier tube available. Performance is almost the same as the Western Electric 422A, perhaps only being a little warmer and having a more euphonic tone/timbre/decay. However, it maintains its speed, transparency, layering, soundstage, and imaging. Like the WE422A, it's pretty much nearly perfect in every way and maintains a sort of neutrality throughout. Warm tube sound but with extended air and treble, great staging, deep bass extension, very nice texture and decay as well. Absolutely zero grain with this tube, just like the WE422A, one of the best tubes out there! Sound-wise, it's very similar and shares the same British tone and sound signature of the GEC 6AS7G power tubes. Great synergy with Sennheiser HD 800. Just like the WE422A, this tube can really bring you to tears on the right music, so much magic in the sound of legendary tubes. Price is slightly cheaper than the 422A.
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