I would rather call this as “beauty in the dark”… No longer perfect in terms of construction, slightly off-center for the mesh and triangle, since probably over 70 years old tube. But… It’s still a nice collectible item. Since the label has gone, from my knowledge, this should be Valvo G2504, but it could be Telefunken RGN2504 also.
How does it sound? Beautiful thick vocal, wide staging, excellent mids, very musical, transparent, but slightly “too powerful” on the preamp section. Added: The low frequency is awesome, tight, and very well controlled. Will compare them with my Telefunken 2004 later. I’m interested to hear the different 😉
Complete appearance, getter on the top. The newer Telefunken mostly has bottom-side getter.
Detail construction inside (the mesh and triangle).