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TY - CONF AU - Kvasha, A.I. AU - Serov, V.L. ED - Kuzin, Maxim ED - Schaa, Volker RW TI - Powerfull RF Triode as Anode Modulator Vacuum Tube J2 - Proc. of RuPAC2016, St. Petersburg, Russia, November 21-25, 2016 C1 - St. Petersburg, Russia T2 - Russian Particle Accelerator Conference T3 - 25 LA - english AB - For 20 years modulator vacuum tube GMI-44A successfully operated in DTL RF system of INR Linac. The vacuum tube had been designed and manufactured at OKB "Swetlana" in the 70s-80s of the last century. The quantity of manufactured tubes - about 80, had allowed the accelerator operating till now. Manufacture of the tubes was stopped In the mid 80s. Attempts of the GMI-44A manufacture restoration or repair were unsuccessful ones. As it turned out, the only decision in the circumstances was using of 200 MHz powerful pulse triode GI-71A as modulator tube. The vacuum tubes GI-71A were installed for the last ten years in all output RF power amplifiers (PA) of INR Linac instead of RF pulse triode GI-54A. In the paper some problems appearing after modulator vacuum tube replacement are discussed. PB - JACoW CP - Geneva, Switzerland SP - 294 EP - 296 KW - vacuum KW - operation KW - cathode KW - impedance KW - DTL DA - 2017/02 PY - 2017 SN - 978-3-95450-181-6 DO - 10.18429/JACoW-RuPAC2016-TUPSA037 UR - http://jacow.org/rupac2016/papers/tupsa037.pdf ER -