Upscale Audio's Kevin Deal reviews the Siemens 7308 Steel Pin

https://www.upscaleaudio.com/products/siemens-7308
Siemens 7308 - Made in the U.S.A. by Philips ECG and branded Siemens. Unlike most 7308 tubes that usually have a somewhat relaxed top end, this tube has a clean top end that maintains extension without being bright, neutral mids, and wonderful tight bass.
If used in a preamp or phonostage, you may hear a slight "ting!" through your speakers when you move switches, or tap on the unit. This is normal.

Видео Upscale Audio's Kevin Deal reviews the Siemens 7308 Steel Pin канала Upscale Audio High Fidelity