6 Zenith Type / Number 58 #58 Vacuum Tubes Valves Engraved Stamped Base Lot Of Six

6 Zenith Type / Number 58 #58 Vacuum Tubes Valves Engraved Stamped Base Lot Of SixThis lot of six Zenith number type 58 stamped engraved base tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. They measured 40, 40, 46, 50, 50 and 55, respectively, where minimum (65%) is 36 and 100% is 56. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR

They have engraved bases

Both tubes measured 30 where minimum (65%) is 22

Transconductance measured 2500/2400 micromhos

I am playing them in my single-ended Mini Mite (with two sets of adapters

please select “2” from the quantity box

Source material is The Beatles "Yellow Submarine Songbook" and they sound terrific

Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40

Admiral-BRANDED 5V4G rectifier tube was tested on our Paul Hart-calibrated TV7/U

This (most likely) Sylvania-MANUFACTURED Wizard-BRANDED number / type 80 rectifier tube was tested on our Paul Hart-calibrated TV7/U

new in box RCA 36MC6 tube -- and another just like it -- tested to spec on our Paul Hart-calibrated TV7/U

new in box Sylvania 14R7 tubes tested tested to spec on our Paul Hart-calibrated TV7/U

This matched pair of Hytron gray glass 6V6GT output tubes was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -36 volts for shorts