Audio Research Telefunken ECC82 Röhre Ruby Tubes KT88 Siemens ECH81 Siemens EL84 Mazda 12AT7 E88CC Röhren Philips ECG Valvo ECC83 Valvo PCC189 GE 6550 A Philips ECG Electron EL-34 Telefunken EL84 Valvo ECC85 Telefunken McIntosh KT88 Gold Aero 6922 General KR Audio KT88 Orion EL34 6CA7 AEG EL34 Ei ECC82 Paar RSD EL84 Telefunken Fullmusic 300B National 6922 Siemens ECC82 Ultron ECC82 Philips ECG AEG ECC83 Paar The Fisher 7189 Orion EL34 6CA7 Golden Dragon Shuguang 300B S Orion EL34 6CA7 Welter EL34-S Valvo ECC81 Philips E88CC RSD EL34 Electro Valvo AZ1 Golden Dragon Svetlana 6H13C Telefunken