Today I rolled 2 sets of tubes through the Lyr/Bifrost Uber setup. First, Voskhod 1979 Silver Shields (Kaluga factory). Second, Amperex Bugle Boy 1959 D Getters (recommended to me by OldSkool). Listened with both LCD-3's and HD800's.
Voskhods with HD800 - These are very nice tubes and enjoyable to listen to, and a bargain at only $10 each. However, the highs are very forward, giving the impression of inadequate bass and mids. The highs also have a slight harshness and are a bit sibilant. The soundstage is excellent; wide and medium-deep with good separation of instruments and voices. With some recordings, the "highs forward" presentation can be exciting. 6/10 on my personal rating system.
Voskhods with LCD-3 - these phones tamed the treble a bit and added a little smoothness, although highs are still very forward. Bass and mids still seem to be lacking in dense passages, although strangely, male tenor voices sounded very good. 6.5/10.
'59 Bugle Boy D-getters with HD800 - Wow, OldSkool did me right recommending these. They are not your "average" Bugle Boys. These tubes are among the best I've heard. Precise/accurate in all frequencies, with a medium soundstage. The presentation has a beautiful smoothness, but they are not warm, which so often is the tradeoff for a smooth sound. These are first-rate. 9/10.
59 Bugle Boy D-getters with LCD-3 - Same comments as with the HD800. I like them a little better with the HD800, but they sound excellent with both. 8.5/10.
Many thanks to OldSkool for recommending them!