Raytheon 12ax7 真空管 アメリカ製 5本|オーディオ機器,(!!!) (Recommended Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1450/1600) (1.0/1.3ma),1950's Raytheon 12ax7 long black plate ,Baldwin 12AX7 tube - made in Japan - 1963 - tested on Maxi-Preamp 2 tester,1 X JAN 12AU7 RAYTHEON TUBE. 1960s PROD. 16. CB402 | eBay