RCA Cunningham 5Z3 Vacuum Tube Black Plate Rectifier Shoulder ST Shape 3CZ3A Octal

RCA Cunningham 5Z3 Vacuum Tube Black Plate Rectifier Shoulder ST Shape 3CZ3A OctalThis RCA Cunningham 5Z3 rectifier tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. It tested 68 in Section One and 58 in Section Two where minimum (65%) is 40 40 and 100% is 62 62. It has a tall, engraved stamped base; black plates, copious amounts of flashing and a nice, old fashioned shoulder bottle. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE

I am playing them in my ArtSound single-ended 805 monoblocks with Steely Dan’s seminal "Aja" album

This matched trio of GE 12HG7 tubes was tested on our Paul Hart-calibrated TV7/U (on the 12BY7 setting) for shorts

I just cleaned this four LP set on my VPI 16

As I test new-in-box 5963s

This Western Electric tube JW-6AK5 tube was tested on our Paul Hart-calibrated TV7/U for shorts

This black plate Delco 5Y3G rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

Meine Seele Hort Im Sehen

new in box Sylvania 1291 industrial-quality tubes tested to spec on our Paul Hart-calibrated TV7/U

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds excellent

This GE 35Z5GT tube tested 55 our Paul Hart-calibrated TV7/U where minimum (65%) is 40 and 100% is 62

6 milliamps/2150 micromhos and 18

new in box Zenith 2BU2 / 2AS2 / 2AS2A / 2AH2 tested to spec on our Paul Hart-calibrated TV7/U