Type 6L6GB vacuum tube. Hickok TV-7B/U tested. One tube, circa 1961, U.S.A made by CBS forSilvertone . Acid Etched Designation(CBS’s emblem) HickokTV-7B/U is a mutual conductance (Gm) type tube tester.
Item Tag: CBS
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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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CBS 5814A tubes, black plates, square / D getter
never been used tested strong balance tester min/good 2200 2650/2600
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Pair of CBS 12AX7 Long Gray Plate Vacuum Tubes
Pair of CBS 12AX7 tubes, screened and labeled for Lowrey organs. These feature long gray plates and O getters. Gm matched to about 13% difference on the Amplitrex AT1000. Number 12AX7. Small signal (i.e. 12AX7) tubes are generally checked for noise and microphonics; power tubes (i.e. 6L6) are usually not.
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Pair (2) 1950’s CBS 12BH7 Preamp Tubes / One Strong One Weak
Here’s a 1950’s pair of CBS 12BH7 preamp tubes.