JAN SYLVANIA 5814A / 12AU7 MATCHED PAIR SAME DT NOS/NIB HICKOCK 539C TEST&MATCH. They are tested for emissions, shorts, mutual conductance, and plates current (if applicable). I offer a money back guarantee on all electronics. For items that need work, Ill specify that its not in working condition. I dont buy and sell many audio or electronic devices. My forte is audio file and tone. Thanks, GlassBatman Price drop, as this is my first time listing any inventory since 2018.

JAN SYLVANIA 5814A / 12AU7 MATCHED PAIR SAME DT NOS/NIB HICKOCK 539C TEST&MATCH. They are tested for emissions, shorts, mutual conductance, and plates current (if applicable). I offer a money back guarantee on all electronics. For items that need work, Ill specify that its not in working condition. I dont buy and sell many audio or electronic devices. My forte is audio file and tone. Thanks, GlassBatman Price drop, as this is my first time listing any inventory since 2018.

JAN SYLVANIA 5814A / 12AU7 MATCHED PAIR SAME DT NOS/NIB HICKOCK 539C TEST&MATCH. They are tested for emissions, shorts, mutual conductance, and plates current (if applicable). I offer a money back guarantee on all electronics. For items that need work, Ill specify that its not in working condition. I dont buy and sell many audio or electronic devices. My forte is audio file and tone. Thanks, GlassBatman Price drop, as this is my first time listing any inventory since 2018.