Cary 805 AE-do they go low?

It all comes down to the output transformer quality, and how the 805 is driven, best is with an inter-stage transformer.

I had some real 805 SET 40kg monoblocks (with variable feedback), not 845 called 805's. I built these up with 13D3 input, 12bh7 pre driver, 300b driver into inter-stage transformer which drove the 805 (900v anodes!!), The output transformer was the highest quality I could get wound (by an output transformer god).
Bass was OK? with the highest 30db of feedback.
A good solid state is more dynamic and blows it away in the bass.
And a good solid state Class-A equals it in the mids and is more extended in the highs.

Cheers George  

Thanks George. So in a few words you're saying they would leave something to be desired.
Probably going another route then. Thanks

They have a questionable "magic" to the mid-range, but I believe that’s highlighted at an expense of the bass which is a little bloated and which adds body to the lower mids. And the highs are not as immediate because of the diminished extension and harmonics which gives a perceived smoother upper mid especially on some not so well recorded female vocals.

What I can say with all the tubes I’ve had Se or PP, I eventually try to improve them with circuit changes/mods, and the better I made them with these changes the closer they got to really good linear solid state amps with plenty of Class-A bias.

My hypothetical tube amp that would maybe blow my socks off would be an OTL that can give the current of a Krell ect, and drive any load down to 2ohms staying flat without becoming a tone control..

Cheers George