VACUUM TUBE AMPLIFIERS LX-380 ,any comment?

thank you very much again
It can also be an integrated like MA 8900 or Luxman L-509X, what do you think?

I do not like your idea of Bowers 805 D3, certainly not with the luxman amp.

bowers specs below: only 88db 1w 1m, that's low efficiency needing more power.

yes those speakers with McIntosh MC275
yes those speakers with Carver Crimson 275

but, 

 they will need a pair of powered subs, they are bass limited,

42Hz to 28kHz (+/-3dB from reference axis)

and, I don't like ports.

       

Description

2-way vented-box system    

Drive units
1x ø25mm (1 in) Diamond dome high-frequency    
1x ø165mm (6.5 in) Continuum™ cone bass midrange        

Frequency range
34Hz to 35kHz        

Frequency response (+/-3dB from reference axis)
42Hz to 28kHz            

Sensitivity (1m on axis at 2.83Vrms)
88dB

Harmonic distortion
2nd and 3rd harmonics (90dB, 1m on axis)    
<1 % 70Hz - 20kHz    
<0.6% 120Hz - 20kHz            

Nominal impedance (min)
8Ω (minimum 4.6Ω)        

Recommended amplifier power
50W - 120W into 8Ω on unclipped programme    

....................................

I would find full range non-ported speakers to use with a tube amp, efficiency 90db or above, then look for tube amp 35-45-75 wpc.

or, for smaller speakers, non-ported mains, still 90db efficiency, with less bass, combined with a pair of self-powered subs.

Thank you for your very clear answer, your explanation in my case would be to drive a Bowers 805 D3, another option that I am seeing is MC 275 from Mcintosh.

never saw or heard it, just looked on their site

feature set looks great, until I got to this

Rated output: 20W + 20W (6Ω), 18W + 18W (8Ω), 14W + 14W (4Ω)

That demands very efficient speakers, which I am in favor of, but by experience/instinct I like having 30/35 wpc minimum.

Highly efficient speakers, often horns, need/have large efficient woofers to keep up with the horns, so large enclosures, exactly what I have used with 4 different tube amps over the years, 30/35/35/45 wpc.

so limited to rooms that can handle large speakers properly away from walls/corners. Now, trying to fill that space with 18 wpc at 8 ohms?

wpc usually increases i.e. 20 wpc 8 ohm/40 wpc 4 ohm, this design is only 14 wpc 4 ohm.

option: efficient smaller mains, and a pair of self powered subs, directional adjacent to mains for stereo bass.

I would want 2 phono inputs, both MM, let MC be boosted via SUT or separate MC Phono. Keep phono more versatile.

Remote volume? Remote Balance?