Matched Quad RCA 2E26 Vacuum Tubes NOS-Testing Lot Of Four Marshall This lot of six Zenith

This lot of six Zenith number / type 58 stamped- / engraved-base tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance was 1670 for Tube One and 1570 for Tube Two where new/nominal is within one standard deviation of 1900

5 inches in circumference

Magnavox-LABELLED 6CW5 tube tested to spec on our Paul Hart-calibrated TV7/U

All measured 1950 micromhos where new/nominal is 2000 and minimum (65%) is 1300

Matched Quad RCA 2E26 Vacuum Tubes NOS-Testing Lot Of Four Marshall This lot of six ZenithThis new old stock TESTING matched quad of RCA 2E26 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 64, 64, 64 and 67 where minimum (65%) is 44 and 100% is 68. These tubes are well made with eight wire snubbers per tube for increased mechanical rigidity and the suppression of microphony. They also have black plates and Micanol bases. WE HAVE SCORES OF