These vintage preamp audio tubes from Siemens are a must-have for any audio enthusiast. With its high-quality German craftsmanship, you can expect nothing less than exceptional performance from these four pieces. The brand speaks for itself and these tubes are a perfect addition to any vintage audio setup. The Ba, Siemens vintage preamp audio tube set is ideal for those who love to tinker with vintage audio equipment. Being a part of several vintage electronics and audio categories, this set can be used for a variety of purposes. So, whether you're building a new setup or simply fixing an old one, these preamp tubes are the perfect addition to your project.