Electro Welter 6550 A-S Tube Audio Bonn RSD EL84 Welter EL34 KT88 Röhre JJ Electronic Welter 6550 A-S Shuguang 300B Valvo EL84 Audio Research Ruby Tubes KT88 EL34 Röhre Fullmusic 300B RFT EL34 Audio Research RSD EL34 Electro-Harmoni Sovtek 6550 WA V.A.L. 300B Sovtek KT88 Gold Lion Svetlana KT88 Shuguang 300B S Electron EL-34 General JJ Electronic 5881 gematchtes Electro Ruby Tubes EL84 Electro JJ Electronic Svetlana EL34 Svetlana EL34 Philips EL34 Mullard EL34 Philips Shuguang 300B Golden Dragon EL34 Röhren Sovtek EL34G KT88 Röhre AEG EL34 JJ Electronic 6550 Röhre Svetlana KT88