RCA 6X4 Vacuum Tube Valve Rectifier Black Plates NOS NIB Mozart LP LM-1030 This tube has a bottom

This tube has a bottom D getter and an E9M date code which means it was likely made by Sylvania

It also sounded great in my Schiit Audio Vali 2 headphone amplifier

TV7/U readings are in (parenthesis)

Transconductance measured 38/38 for Tube One (CBS-labeled) and 38/42 for Tube Two where minimum (65%) is 32/32

Tube Two tested 24

RCA 6X4 Vacuum Tube Valve Rectifier Black Plates NOS NIB Mozart LP LM-1030 This tube has a bottomThis new old stock, new in box black plate RCA 6X4 was tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. There were no shorts or gas and it measured 55 55 where minimum (65%) is 40 40 and 100% is 62 62. 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 HAVE ANY QUESTIONS. 1.