Are most tube preamps ‘ultra linear’?

I never had a ’triode’/’ultra-linear’ choice until I got my Cayin A88T 22 wpc triode/45 wpc ultra-linear.

1. the ultra-linear’ power doubles. no change in volume when you change back and forth, just a discernible different sound ,

and the ultra-linear has more headroom, reserve for transients, instantaneous dynamics if needed

2. I and all my friends definitely prefer the sound of ’ultra-linear’, which happily gives me the extra watts if needed,

my speakers are very efficient horns, rarely need much power, but it never hurts.

this thread belongs in the 'remedial education' folder

...the ultra-linear’ power doubles. no change in volume when you change back and forth, just a discernible different sound...

If you are learning about tubes, this is not remedial. Throw in 4 and 8 ohms taps and I am really lost! :-)

I read this thread because I am new to tubes.  Now I know a little about what ultra linear refers to.  The condescension in this forum is at times amazing.  Big fish in a shallow pond, I suppose.

One thing That is good to look for is a preamplifier operating in pure class A . I find their purity very appealing 
a  DHT is the purest single ended But it lets you hear everything 
not all speakers and amplifiers are a ideal match . I have owned 
several hand built models from Vacuum tube Guru Radu Tarta 
exceptional build and sound quality.