Both the V70se and V80se are excellent IA's. I used to own a V70se and later the V110 with the black box. I also had Dyn C1's and later the Signatures. I had an in-home demo of the V40se for a week. As you move up the line there is a bit more control in the music. IMO the black box or super black box is a must. Lowers the noise floor quite a bit and provides a touch more headroom. I have not heard the V80se only the V80. I got out of tubes just before the V80se came out. The V80 had better transformers. One nice thing about the V110 is it has a switch on the back to change the plate voltage down to accommodate tubes like EL34's 6550's and KT88's that way you are not limited to KT120's. Honestly I hated the KT120's. I'm guessing the V80se also has it so your not limited to KT120/150. I did find Ei KT90's worked great and sounded better at the higher plate voltage.
Per Andreas the super black box was designed for speakers with multiple drivers. I never tried the SBB with my C1's but my friend with the a V80 - BB and Dyn Sapphires demoed a SBB. the difference was IMO was huge. So I can't say what gain would be had with the C20's.
@david_ten I would say the V80se would out perform the V70se with the SBB.
The beauty of tubes is if you ever want to change up the sound signature just swap out some tubes instead of buying a new amp. When I had the C1's I rolled many different tubes and found the original Tung Sol 6550 black plates sounded the absolute best to me and my dealer. BUT when I decided to upgrade my Dyn C1's for Raidho D1's I hated the the TS 6550 bp's. I liked the Ei KT90's much better with the D1's. Now with the Dyn's the V70se or the V110 never ran out of 'steam' when pushed extremely hard. But with the Raidho's they would only when pushed hard. Maybe the SBB would have helped.
So I would go with the V80se and consider a BB at a later time.
Per Andreas the super black box was designed for speakers with multiple drivers. I never tried the SBB with my C1's but my friend with the a V80 - BB and Dyn Sapphires demoed a SBB. the difference was IMO was huge. So I can't say what gain would be had with the C20's.
@david_ten I would say the V80se would out perform the V70se with the SBB.
The beauty of tubes is if you ever want to change up the sound signature just swap out some tubes instead of buying a new amp. When I had the C1's I rolled many different tubes and found the original Tung Sol 6550 black plates sounded the absolute best to me and my dealer. BUT when I decided to upgrade my Dyn C1's for Raidho D1's I hated the the TS 6550 bp's. I liked the Ei KT90's much better with the D1's. Now with the Dyn's the V70se or the V110 never ran out of 'steam' when pushed extremely hard. But with the Raidho's they would only when pushed hard. Maybe the SBB would have helped.
So I would go with the V80se and consider a BB at a later time.