4 RCA Number Type 43 Vacuum Tubes Valves Shoulder Shape NOS NIB Lot Of Four Black Gray Glass new in box Mullard-MANUFACTURED

new in box Mullard-MANUFACTURED

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds excellent

They tested 51/52

" They have black and silver glass

Silvertone-BRANDED 6K7GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

4 RCA Number Type 43 Vacuum Tubes Valves Shoulder Shape NOS NIB Lot Of Four Black Gray Glass new in box Mullard-MANUFACTUREDThese four new old stock, new in box RCA number type 43 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