Amperex 13GB5 XL500 Vacuum Tube NOS NIB

Amperex 13GB5 XL500 Vacuum Tube NOS NIBThis new old stock, new in box Amperex MANUFACTURED, DuMont BRANDED 13GB5 XL500 tube tested to spec on our Paul Hart calibrated TV7 U 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. MOST FORMS OF SHIPPING EXCEPT MEDIA MAIL ARE AUTOMATICALLY INSURED UP TO $100. ETSY PURCHASE

I am playing them in my Musical Paradise MC-3 single-ended integrated amplifier (with adapters

They have NU 188-5 and 3-09 188-5 date/provenance codes

This lot of three US-made 14B6 was tested on our Paul Hart-calibrated TV7/U for shorts

please select “2” from the quantity box

This softcover book is in very good condition and comes from a non-smoking household

It comes as pictured with Twistoflex-style band that was once gold-anodized which has lost most of its color

This new old stock-testing National Union globe / balloon-style bottle number 36 tube tested 42 on our Paul Hart-calibrated TV7/U where minimum (65%) is 26 and 100% is 40

new in box RCA 6ME8 tubes tested to spec on our Paul Hart-calibrated TV7/U

They have top D getters

Pictures Three and Four are included to underscore this fact

This matched pair of Sylvania 6AU6A tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Sylvania-BRANDED 13GB5 / XL500 tube tested to spec on our Paul Hart-calibrated TV7/U