The Tempest 1 was 60 watts stock. Your Magnum is probably 90 watts. I'm pretty sure the KT90's are actually about 1/4 inch taller than the 120's. the issue you'll run into is the larger diameter of the 120. I think Rogue will tell you you can use them and they'll probably sell you a new tube cover with larger knockouts. They told me I have that option with my Cronus Magnum. I'm very close to calling them to order a new cover and the tubes.
Rogue Tempest Magnum original ver questions
Hi all,
I have a few questions about this amp, and cannot find answers anywhere. This is in regard to the original, mk 1 version of the Rogue Tempest with the Magnum upgrade..
1. Does the magnum upgrade increase power output? I believe non-magnum ver does 60 watts per channel. Is it higher on the magnum version?
2. Can I use EL34 tubes in this amp?
3. Can I use KT120 tubes in the amp, with the cover removed to compensate for increases tube height?
Thanks for responding to my first Audiogon post.
I have a few questions about this amp, and cannot find answers anywhere. This is in regard to the original, mk 1 version of the Rogue Tempest with the Magnum upgrade..
1. Does the magnum upgrade increase power output? I believe non-magnum ver does 60 watts per channel. Is it higher on the magnum version?
2. Can I use EL34 tubes in this amp?
3. Can I use KT120 tubes in the amp, with the cover removed to compensate for increases tube height?
Thanks for responding to my first Audiogon post.