6CA7
The tubes arrived beautifully packaged in a box, after being turned on they have a very good sound, quite unusually dense bass, beautiful mids and brilliant highs, they are beautifully noticeable, they radiate in the sound exactly what you would hear in the studio, they are that good. I have a Cayin CS 88 A amplifier and these tubes fit it beautifully, thank you for the very fast delivery