I was just given a couple of mid-late 60s GE 12AX7 (6681) tubes made in GT Britain. In my "Google" searches, I see these may *possibly* be re-branded Mullards from 1966...... Either way, they're probably better than newer tubes.
So my question... I know changing the Phase inverter tube in the Ray makes a little difference in tone, but will it be worth using (possibly) NOS tubes in that spot or will it make a huge difference? Otherwise, my other amp would probably benefit quite a bit from a couple old 12AX7's since it uses these as preamp tubes (unlike the Ray).
Last Edit: Jan 12, 2013 15:53:38 GMT -7 by telejas
According to Dave Hunter's "Guitar Amp Handbook" a nice vintage 12ax7 would be better served in the V1 position. Not applicable for the ray in V1 but you get the gist... He says a modern quality balanced triode 12ax7 would be the best for a PI tube.
The real art of conversation is not only to say the right thing in the right place, but... to leave unsaid the wrong thing at the tempting moment. - Dorothy Nevill
I swapped out the new Tungsol for the old GE tube and not a huge difference in tone (like swapping the EF86 would do), but it seemed to "focus" the amp a little better. I can't tell much difference with single notes, but when playing chords, they sound tighter (for lack of better words).
I'm going to leave it in for a while to see what I think.
Last Edit: Jan 12, 2013 15:59:31 GMT -7 by telejas