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Tube Watts vs. Solid State Watts - Any credence?

I've heard numerous times that Tube watts are not the same as Solid State watts when it comes to amps running speakers. For example, a 70 watt tube amp provides more power than a 140 watt solid state amp. Is there any credence to this or just sales talk and misguided listeners? If so, how could this be? One reason I ask is a lot of speakers recommend 50 - 300 watts of amplification but many stores have 35 watt tube amps or 50 watts tube amps running them. More power is usually better to run speakers, so why am I always hearing this stuff about a tube watt is greater than a solid state watt?
djfst
kijanki's avatar
kijanki
3,575 posts
 
85W vs 70W 5.7% loudness increase
45W vs 40W 3.4% loudness increase
unsound
6,115 posts
 
Djfst, I do believe your original question has been answered.
Without knowing the minimum impedance and phase angle of your speakers, as well as the dimensions, etc. of your listening room and volume levels you hope to achieve, it's problematic to provide quality technical assistance.
With what you have provided, IMHO a conservative recommendation to start with(?), might be to use a ss amp rated at 100 Watts that can double down, or a tube amp that's rated at 200 Watts.
geoffkait's avatar
geoffkait
14,147 posts
 
And without knowing the, uh, drum roll please, efficiency of the speakers.
unsound
6,115 posts
 
^sensitivity 91 dB, 4 Ohm nominal.
ait
480 posts
 
How does a large power transformer affect high frequencies?

Output transformer, maybe...
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