The 7729 is a premium, low-noise industrial version of the standard 12AX7 vacuum tube. Standard 12AX7 tubes can vary wildly in background noise, hiss, or microphonic ringing.
Item Tag: CBS
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CBS 7025 (12AX7 ECC83) Long Plate D Getter VACUUM TUBE TV7 TESTED STRONG
Tested strong using a professionally calibrated TV7A/U tube tester at 42/40gm (32 is minimum).
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Set of 3 CBS 6SN7GTB & CBS Hytron 6SN7GT Vacuum Tube
The gentleman was a repairman. We do not know anything about these tubes. We will picture them to the best of our ability and note #’s when found. In addition to the tubes there are 5 cases. One original box, one loose.
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QUAD NOS NIB CBS 6SN7 GTB TUBES ALL TESTED over 100% DATED 1960
Minimum for a good 6SN7 is 50. Four NOS NIB CBS 6SN7GTB Tubes from a partial case. All dated 6052. 52 week of 1960. These were part of a NOS Case. Excellent tubes. These are NOS Tests!
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CBS Hi-Fi Matched 6550 Power Tubes – Original CBS Boxes Triple getter match code
CBS Hi-Fi Matched 6550 Power Tubes – Original CBS Boxes – Matching 1959 Date Code 5952 – Triple D Getter – Strong Matched Pair. Genuine CBS Hi-Fi Matched 6550. In addition to laboratory testing, the tubes were installed and evaluated in aWillsenton R8 integrated amplifier under normal listening conditions.
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NOS Tested 5AS4A/5U4GB Rectifier Tube Strong Dual Diode Vintage Audio Guitar Amp
N/A this tube is tested on the diode scale and has to be past halfway through the red bar of the middle gauge that is red yellow and white to be good and as long as it’s past the green, it’s supposed to be NOS and this is Well into the green.
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1961 CBS 5881 (6L6WGB) Tube – Hickok 539B Tests @ 6200, min:3300
Type 5881 (aka. 6L6WGB) vacuum tube. Hickok 539B tested. Hickok 539B is a mutual conductance (Gm) type tube tester. One tube, circa 1961, U.S.A.made by CBS. Tube#1 6200. <<<<< As pictured = The tube you see is the tube you receive.
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±1950 CBS 6L6 metal Power Amp Tube – Hickok 539B tests @ 5800, min:3300
Thoroughly tested on Hickok 539B . Hickok 539B is a mutual conductance (Gm) type tube tester. CBS 6L6 vacuum tube. <<<<<<< As pictured = The tube you see is the tube you get! One tube,circa +/-1950, U.S.A. made.
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1955 Sylvania/CBS 6L6GB (5881,6L6G,6L6GA) Tube – Hickok TV-7B tests @ 42, min:25
Type 6L6GB vacuum tube. Hickok TV-7B/U tested. One tube, circa 1955, U.S.A made by Sylvania forCBS . Acid Etched Designation(Sylvania’s emblem) HickokTV-7B/U is a mutual conductance (Gm) type tube tester.