My first Tube Amplifier

My first tube amp was a Conrad Johnson MV55. It was a really nice sounding amp. Sold it and moved on to try a lot of different tube and Solid State +50-75 amps in the following 25yrs. My first SS amp was just before the MV55, it was a Forte Model 4a. Another nice sounding amp. Since, I’ve owed some really good amp throughout the years and my favorite tube has been the 300b. I still own 4 amps that use 300b power tubes. I’m presently using 3 amps now in my system that I am very happy with and will probably never remove them because they just sound so awesome and perfect. The Conrad Johnson Premier Four, MV55 and Forte Model 4a modified, upgraded by Jon Soderberg of vintage amps repair. Yes that’s right, I discovered that I should have kept the MV55 and Forte so after 25yrs I bought them again and they are fabulous. 

Just to mention, I own the Threshold SA/3, very nice amp, very pure and musical. Never had a Marantz tube amp but I own an original Marantz 7 and the phonostage is awesome. Use it in one of my setups and I have a K&K phonostage in my other system. I agree with someone’s post here about the 6550/KT88 tube, once your ears get accustom to EL34’s, 300b’s, and other great power tubes, can’t listen to 6550’s any longer. 

Don’t want to stray far from this topic but can I get opinions on the best power tubes people like and what is it about their sound quality that makes them sound good to you. I personally like EL34’s because of the way they present  detail and resolution in a non aggressive way. My #1 tube is the 300b because it sounds more like music than any other power tube I’ve heard. What are your favorites?