Tube rolling update
I received the Siemens silver plates a couple days ago and have been listening for the about 4 hours. I am also on day 4 of the ridiculous warming up requirements of the GMB so some of the SQ comments below may have been impacted by this.
Overall - you are right Jeb, these are "the ones". In brief, the Siemens have the the bass extension of the Phillips but tighter; the smooth, slightly forward mids of the Mullards but better detail; and lastly the treble extension is better than either. In terms of soundstage, the width sounds about the same as the Mullards, but my closed headphones probably have more to do with that. However, the depth of sound especially in the layers of bass are superb. The Siemens don't have the "liquid" quality of bass of the Phillips and you lose some boom, but the accuracy and layers of sound are far superior. If you want some of the boom back, just up the 60 Hz range by about 3-6 dB.
I do caution folks from putting too much into my own personal impressions. Looking at my entire chain, I have a neutral DAC (used to be warm before multi bit upgrade) and a neutral, if not analytical headphone in the T5P. Any coloration of sound on your own equipment likely impact the overall sound than just tube rolling.
Perhaps it's nostalgia, but I've listened mostly to modern remasters of some classic prog rock and just loving it:
- ELP (self title)
- King Crimson, Night Watch
- Led Zeppelin, I
- Rush, various singles
I think the combo of the GMB and a great tube amp like WA7 really brings these classics to life! I'm likely going to put a number of tubes in classified to recoup some rolling costs, but will probably wait until I get my Ether C and redo all the fun of rolling!
I do have a couple more tubes coming - Valvo branded Philips (curious if there is a difference) and Westinghouse carbon blacks. Will report back on these as well.