hmm. impressions from GEC 6AS7 and Beyer T1. I need different driver tubes. as of now, the GEC is definitely better tonally and more detailed than 5998. but is lighter on the bass and also brighter in the treble.
with Sylvania 7308, not very good, with Bugle Boys, most detail, wide and airy, but improvements also made midrange weird and treble bright at times, was too bass light, maybe only good with good recordings, the T1s sounded really fast with this combination. with Amperex A-frame 6922, also bass light and weird midrange/treble. and now, with reflector 6n23p, the bass kinda came back and treble wasn't bad, mids came out, but this tube isn't as good as the amperex, so transparency and soundstage aren't as good.
conclusion, Amperex A frame 6922 and 5998 are best with T1. i should upgrade to WA22 or get different drivers (maybe mullard cv2492?). i need to find a combo that works with T1/GEC 6AS7G, its hard to go back to the 5998 since it has less detail than the GEC.
now....the HD 800 and GEC 6AS7G/Bugle boys was outstanding. a little bright at times still, but the details and soundstage and everything was soooo good.