forgot about the dark option, thanks for the mention. i may have to order a stereo 100 dark.
i tried everything to brighten the non dark version including all sorts of tubes and a bright preamp but no luck.
Also if you need a bit more top end energy and zing in Rogue amps, the Mazda silver plate 12ax7 (not 5751) is a panacea. It sounds almost like a full component upgrade in the right scenario. I used ’em in Apollos and Apollo Darks, even when not wanting the extra top end for the latter, just because they’re so damned good. They were absolutely a huge upgrade for the original Apollos. I got mine from Brent Jesse. Short of Mazda silvers, the Telefunken ribbed plates is one to try (easier to find and cheaper than Mazda) - NOT the smooth plate kind though, which are warmer.
I’m kinda wondering now if the plain Apollos with Mazdas might have been better than the Apollo Darks lol. The Darks ship with Telefunken smooth plates, which it needs for balanced tonality, but the absence of the Mazda's detail, dynamics, punchiness is quite obvious with that sub.