4 Sylvania 6GX6 6GY6 Vacuum Tubes Valves NOS NIB Lot Of Four RCA 6X8 NOS NIB " They have black and

" They have black and silver glass

Special Features: SC 8762 A (World War Two US Army Signal Corps contract codes)

They are nice and quiet when the SACD is paused and have excellent frequency response

excellent flashing and what appears to be a US Navy logo on the base

These tubes have banded phi-shaped mica spacers

4 Sylvania 6GX6 6GY6 Vacuum Tubes Valves NOS NIB Lot Of Four RCA 6X8 NOS NIB " They have black andThese four new old stock, new in box Sylvania 6GX6 6GY6 tubes 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 PROTECTION COVERS