I pulled my Zephyr (current, one-tube version) out of the rack and spent a little time, today, trying it with a few different tubes. In there, to start, was a JJ ECC83 (short plate). I also tried a TAD (Tube Amp Doctor) ECC83 WA and a Tung-Sol 12AX7. Nothing fancy.
I found each to sound and feel noticeably different with the same control settings -- and found myself dialing the preamp in a little differently to get the best (to my ears) out of each tube -- but found that I could get (largely but not completely overlapping) results I liked with all of them.
I was playing my modified Fender Power Jazz Bass Special (same bass as in the clips a few posts up), with roundwound strings, with the Zephyr's bright switch engaged, through an Audiokinesis Hathor 1203 cab.
I found each to sound and feel noticeably different with the same control settings -- and found myself dialing the preamp in a little differently to get the best (to my ears) out of each tube -- but found that I could get (largely but not completely overlapping) results I liked with all of them.
I was playing my modified Fender Power Jazz Bass Special (same bass as in the clips a few posts up), with roundwound strings, with the Zephyr's bright switch engaged, through an Audiokinesis Hathor 1203 cab.
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