Two Excellent 6AB7 Tubes. One Tube: SYLVANIA 6AB7 1853 & New Labeled Generic Tube Box. One Tube: RCA JAN CRC 6AB7 VT-176 and RCA Tube Box. Discriminating Test Results from an AMPLITREX AT1000 Tube Tester.
Two Excellent 6AB7 Tubes. One Tube: SYLVANIA 6AB7 1853 & New Labeled Generic Tube Box. One Tube: RCA JAN CRC 6AB7 VT-176 and RCA Tube Box. Discriminating Test Results from an AMPLITREX AT1000 Tube Tester.