Have any of you experimented with tube rolling the 12AX7 in an Arkham? My Oracle came with a JJ, but I’m curious what difference various NOS tubes would make.
I'm curious about this too. Has anyone done any tube rolling? Did you notice much difference? What tube did you like? Why?
I'm thinking it's time for a new tube in my Zephyr - sometimes it gets a hissy, crackly noise (of the sort I've heard many times from tube amps), which stops if I unplug my cable from the input and plug it back in (it seems to be sensitive to vibration). And I'm going to be in the studio next month, so it's got to work perfectly.
I had one of the older Zephyrs (with two tubes, rather than one -- ECC82 output driver in V2), sold it, and now have one of the newer ones (with a single tube). I tried a few different tubes in the older one -- haven't, yet, with the newer one.
In the older Zephyr, as with the Demeter 201 I had at the time, I found that changing the tube in V1 had a significant though not an earth-shattering impact on the feel and the tone. (I found that V2 had a significant impact in the Demeter -- significantly less so, but still some, IMO, in the Arkham, though Micah had said I shouldn't notice much, if any.)
In V1, I tried a Yugoslavian EI ECC83 (lots of gain and a big, beautiful, gnarly sound, but a little uneven in its response) and an old Hammond (re-branded Sylvania) 12AX7. The Hammond didn't bristle the way the EI did, but its response was more even and it felt more lively and clear than a JJ short plate. I ended up liking the EI in the Demeter pre (with a JAN Phillips 12AT7 in v2 -- the Hammond and the EI together were fantastic in a Mesa Walkabout, btw).
That said, the Zephyr sounds pretty good with a plain, old JJ short plate in there. (I think that's what's in my current Zephyr -- I might try something else, soon -- regrettably, I don't have the Hammond or the EI anymore.)
I'd be curious to get the old and new Zephyrs side-by-side, to see if I can hear or feel a difference, but I don't think that's practical. Haven't done much with the new Zephyr, yet, but, for what it's worth, when my brother found out I didn't have the old one anymore, he was bummed -- it was one of the very few pieces of bass gear I've ever owned that he was at all jazzed about.
Here's the old Zephyr with the Hammond tube (excuse the clams):
And here's a track I found, from further back, playing the Zephyr, a Monique, and the Demeter 201, back to back (looping 8 bars of each, several times, in that order, and adding a layer each time -- no idea what the EQ settings were -- I might simply have left the knobs at noon for each pre):