RCA Cunningham Radiotron Number Type 80 Vacuum Tube Rectifier Black Plates Engraved Base Shoulder ST Shape Hanging Filaments

RCA Cunningham Radiotron Number Type 80 Vacuum Tube Rectifier Black Plates Engraved Base Shoulder ST Shape Hanging FilamentsThis RCA Cunningham Radiotron number type 80 rectifier tube was tested on our Paul Hart calibrated TV7 U. It measured 35 34 where minimum (65%) is 40 40 and 100% is 62 62. It teats below spec but should work fine in many applications. It has a dimpled sheet getter; mica snubbers; an engraved base; hanging filaments and outstanding flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER

GM-Delco-BRANDED 6AX8 tubes tested to spec on our Paul Hart-calibrated TV7/U

dimpled-sheet getters and terrific flashing

This is a Dutch auction starting with five new old stock

new in box and tested to spec on our Paul Hart-calibrated TV7/U

This tube has black plates

Transconductance was 1710 for Tube One and 1960 for Tube Two where new/nominal is within one standard deviation of 1900

new in box Westinghouse 12X4 tube tested to spec on our Paul Hart-calibrated TV7/U

This CD played fine in my Denon DCD-1650AR

8 milliamps' plate current / 2170 micromhos

They sound spacious with excellent dynamic range and frequency response on these challenging pieces -- and are dead quiet when the CD player is muted

new in box US-made 6AU8 / 6AU8A tubes tested to spec on our Paul Hart-calibrated TV7/U

copper support rods and great flashing