These tubes are electrically equivalent to 6SN7 when used with adapters (not included). Adapters are NOT included (required for 6SN7 socket use). These early Raytheon carbonized black plate VT-99 are known for a presentation that differs noticeably from later 6SN7GT/GTB types.
Item Tag: Stati Uniti
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CBS Hytron 5814A Vacuum Tube USA 12AU7 Type NOS Vintage Pre 1950 Black Inside
For sale one Have 4 in stock Black inside not gray Pre 1950s tubes here Vintage CBS Hytron 5814A vacuum tube. • Made in USA • Equivalent to 12AU7 • Military/industrial grade tube • Orange print, vintage production • Appears NOS • Clean pins, no visible damage • Untested – no tube tester available Highly regarded for audio and vintage equipment use. Sold as-is, untested, no returns. US mainland shipping only.