Well then, Amperex and Mullard are out; they reveal lots of textures.
IME, the 7308 Siemens West Germany would be worth a try. And with Telefunken, there is a difference between the smooth plates and the ribbed plates.
IME, the 7308 Siemens West Germany would be worth a try. And with Telefunken, there is a difference between the smooth plates and the ribbed plates.