@painter24 I predominantly listen to Jazz (all eras, all flavours) and am very interested to hear what tubes would bring me; I’ve casually read around, and the description of sound from reviewers and regular users does appeal to me greatly
Given this statement I’d strongly encourage you to go full bore and get a Willsenton tube integrated amplifier. The Triangle speakers are generally said to be tube amplifier friendly and easily driven.
I don’t know if their 300b SET would be suitable (Depends on several variables). They do have push-pull amplifiers that I believe would pair well with your speakers. Your jazz musicians will come to life via their recordings . This is a good path to take.A tube preamplifier is fine but a half step in my opinion if you are seeking the full tube experience.
Charles