(slightly microphonic) 5670 RCA NOS triple mica "O" getter halo 1961 (7.6/10.8ma)
(sold out) 6414 Raytheon triple mica black plates NOS 1950's misbranded E80CC National
12AT7=E81CC=6201 Siemens triple mica NOS 1971 (12/15.8ma)
JG-6189=12AU7WA GE triple mica NOS 1963 (8.6/10.4ma)