Recorded test results: 2000 / 2200. The original tester notation remains written directly on the glass and is shown clearly in the photos. Tube has a clean-looking internal structure, strong base lettering, and light age-related oxidation/tarnish on the pins.
Item Tag: CBS-Hytron
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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.
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ONE CBS Hytron 5814A Tube / Square Get Amplitrex Tested Strong & BALANCED 12AU7
ONE CBS Hytron 5814A tube. Tubes Tested on Amplitrex AT-1000 computerized tube tester (fixed bias mode). -Tube #1= 2100 micromhos and 10.3 mA plate current. -Tube #2= 2100 micromhos and 10.6 mA plate current.
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Vintage 1956 CBS Power Transistors Manual 2N155 2N156 2N158 Booklet
This is an original CBS Power Transistors manual from 1956. It is a four page booklet that has been very well kept.