This is a collection of clippings of vacuum tube amplifier circuit diagrams and construction articles from "Musen to Jikken" (Wireless and Experiment). I've kept them with the intention of building them someday. The paper is discolored. The condition is poor, please be aware. I had previously listed these separately, divided into ① to ⓾. I am relisting them all together. It would be difficult to build these now, but how about them as reference material? ① PX4PP Katsutaro Anzai DA-30AB1PP Tadao Morikawa Design Section: Due to unsatisfactory power supply, it was improved in ⑨, and is a construction article. 50CA10PP Akira Yasui ② EL34 Class A PP Katsutaro Anzai KT66 Single Seiichi Kiuchi ③ KT66PP Moe Ochiai WE350B Single, Monoaural Katsutaro Anzai, Seiichi Kiuchi ④ Setron 300B Single 6W Moe Ochiai ⑤ WE350B Single, Monoaural 15W Can be replaced with the king of professional beam tubes, 6L6. Katsutaro Anzai ⑥ Setron 300B PP Shinichi Fujimoto ⑦ V503 from British Mazda, said to be the European 300B It's probably difficult to obtain now. Katsutaro Anzai, Seiichi Kiuchi ⑧ WE300B Single Manabu Miyamoto ⑨ ★ For serious 300B enthusiasts PX25A, driver is 310A. Katsutaro Anzai ★ DA30 There seems to be trouble with the power supply designed in clipping ①. Tadao Morikawa ➉ 6080 Single Ryuji Hirai 45PP Transformer Coupled Isamu Asano PX25 Single Katsutaro Anzai 6G4BPP Tadao Morikawa ★ There are notes and writings from the time of construction. 6GB8 Single Katsuji Yamakawa KT88PP Yoshio Uesugi