(!!!) 6SL7WGT Sylvania branded Raytheon 5691 brown base round black plates "D" getter halo used/good 1950's (1.6/1.8ma)

1 low noise tube) 6SL7WGT Sylvania branded Raytheon 5691 brown base round black plates "D" getter halo used/good 1950's in white box

1.6ma Gm=1300

1.8ma Gm=1500

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