Amperex Websites:
space-tech-lab.com
Space-Tech Laboratory - High-End Audio
Space-Tech Labratory High-End Audio
tubemonger.com
Fine European and American NOS Audio and Guitar Tubes.
Fine NOS Tubes from Amperex, Mullard, Cifte, BEL, Ferranti, Visseaux, Siemens & Halske, Telefunken, Siemens, RCA, Tung-Sol, Tesla, Mazda, La Radiotechnique, Philips, Valvo,...