Are most tube preamps ‘ultra linear’?

Is ultra linear prefered ?

hard to discern this designation when reviewing specs.

emergingsoul09-29-2021 2:29am

jasonbourne52 Details Discussions Posts This discussion Message User 2,863 posts 09-29-2021 at 12:30pm Copy Comment URL Report Comment Edit Delete Ultralinear circuit only applies to a tetrode/pentode tube amp with an output transformer having a screen tap.
jasonbourne52 Details Discussions Posts This discussion Message User 2,863 posts 09-30-2021 at 12:22am Copy Comment URL Report Comment Edit Delete DHT triodes are almost never used as preamp tubes because the gain is way too low - plus noise is a problem!
jasonbourne52 Details Discussions Posts This discussion Message User 2,863 posts 09-30-2021 at 12:19am Copy Comment URL Report Comment Edit Delete @audioman58 : All tube preamps operate in Class A! They have a single tube connected to the output straight - or through a cathode follower or a transformer!