It's been a while since Rogue came out with the 99 Super-Magnum upgrade, but I don't think they've been advertising it. Certainly, you can call Rogue to get the info and/or order.
Have a friend in town that had his 99 Magnum upgraded to super-magnum. He tells me it's a substantial upgrade (I trust his hearing). However, the Athena and Hera II are much better still - he's heard my Hera II several times, and plans to go there when funds allow.
I used to own a 99 Magnum (recent vintage) myself, and it's a nice little preamp with a good 6sn7 complement. However, the Hera II makes it sound (almost) broke, by comparison - no tuberolling required. The Athena that I've heard is also very, very nice. I think the Athena/Hera II are the finest components in their lineup, and I've heard a lot of them.
Have a friend in town that had his 99 Magnum upgraded to super-magnum. He tells me it's a substantial upgrade (I trust his hearing). However, the Athena and Hera II are much better still - he's heard my Hera II several times, and plans to go there when funds allow.
I used to own a 99 Magnum (recent vintage) myself, and it's a nice little preamp with a good 6sn7 complement. However, the Hera II makes it sound (almost) broke, by comparison - no tuberolling required. The Athena that I've heard is also very, very nice. I think the Athena/Hera II are the finest components in their lineup, and I've heard a lot of them.