These are 6SN7WGTA tubes which are the ruggedized version of the 6SN7GTA. They can be used in applications calling for the 6SN7GT and 6SN7GTA. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure-test at 3250-3250 and 3250-3125 where pass/fail is 1625 micromho.
Item Tag: Vacuum Tube
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JAN CWL-12AU7 Westinghouse 337 1959 Long Black Plate D-Getter Low Noise Tested
Test Results: Mu/Gain: 16.2 / 16.7 Transconductance: 1.59 / 1.50 mA/V Noise: -84.8 / -85.4 dB Microphonics: Low microphonics — the tap is audible when the tube is tapped, but it dies out quickly with no ringing or excessive feedback
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EL34/6CA7-Z Shuguang Treasue Series matched pair(2) pcs tone masters
This results in a natural distortion free sound that is as good as or better than the old style NOS tubes. These are supplied in matched pairs. Two (2) per lot. AAAAA+++++. The Gov’t is collecting high duty on small parcels from China.
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1 Good Raytheon Black Plate 12AX7 tube #40011
1 Good Raytheon Black Plate 12AX7 tube.This tube test 42-37 where 32 is the minimum good and new tubes test 48 to 50 on are tv7 tube tester.
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Matched Pair 6V6GT RCA smoked glass/black plate Vacuum Tubes, TV-7D Tested
Smoked Glass. ‘Matched’ refers to comparing the gm test results between the lowest to the highest of the identical sections of a set of tubes. ‘Matched’ I consider to be within 10%. RCA one labelled GM.
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1956 UNITED USAF-596 RECTIFIER TUBE NOS BLACK PLATE 5U4G WE 274B 5U4 5AR4 GZ34
LOOKS NEW TESTED FOR CONTINUITY WAS IN A BOX WITH ABOUT A DOZEN OTEHR TUBES MARKED NOS.
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Tung-Sol JAN-CTL 6SU7-GTY Black Glass Brown Base – Matched Pair – Measure as NOS
Dead quiet when idle, and stable during high output amplification. Both tubes test very strong, slightly above NOS. NOS = 3,200. 6SU7-GTY, brown base and black glass tubes are a premium, ruggedized, tightly specified version of 6SL7-GT tubes.
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(2) Raytheon 6SN7GTB Tubes Black Plates O Getters Tests NOS Amplitrex
(2) Raytheon 6SN7GTB Tubes Black Plates O Getters. Tested on an Amplitrex AT1000.