Matched Trio Raytheon 5Z4 Vacuum Tubes Rectifiers Lot Of Three 7025 NOS NIB

Matched Trio Raytheon 5Z4 Vacuum Tubes Rectifiers Lot Of Three 7025 NOS NIBThis matched trio of Raytheon 5Z4 rectifier tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. They tested 51 52, 54 53 and 54 55, respectively, where minimum (65%) is 40 40. They have 280 739, 280 739 and F1 date codes, respectively. 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

new in box black plate CBS-Hytron 6W4GT tested to spec on our Paul Hart-calibrated TV7/U

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

anode radiators for cooler operation and longer life and have acid-etched GE dots

an O-getter

gas and transconductance with 400 volts on the plates and a bias of -48 volts

47 and 54 where minimum (65%) is 36 and 100% is 55

Transconductance measured 56/56 for Tube One and 58/58 for Tube Two where minimum (65%) is 25/25 and 100% is 38

copper support rods and gray plates

GM-BRANDED 6SK7 tested as good on our Paul Hart-calibrated TV7/U

but should work fine

6 volts on the filaments

THERE ARE NO MANUFACTURERS TO TAKE PRODUCT BACK BECAUSE OF DESIGN FAILURES OR QUALITY-CONTROL ISSUES