RCA 12A8 12A8GT Vacuum Tube NOS NIB

RCA 12A8 12A8GT Vacuum Tube NOS NIBThis new old stock, new in box RCA 12A8GT and two other similar tested to spec on our Paul Hart calibrated TV7 U. Etsy will tell you how many are available in this Dutch Auction. 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

new in box Cunningham 35/51 tube tested to spec on our Paul Hart-calibrated TV7/U

6 milliamps/6800 micromhos while Tube Two measured 36

Wish I could tell you who actually made them

new in box US-made 12K5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance was 1890 for Tube One and 2000 for Tube Two where new/nominal is within one standard deviation of 1900

It was dead quiet when the CD player is paused and had excellent frequency response

And if you want all five

I have played it in my Cern Audio phono pre-preamplifier as a 6SL7 substitute (with an adapter

Transconductance was 1670 for Tube One and 1570 for Tube Two where new/nominal is within one standard deviation of 1900

They have 7-09 188-5 and 630 188-5 date/provenance codes

I have played it in my Schiit Vali 2 and it sounds great

It measured 42/44 where minimum (65%) is 33/33 and 100% is 51/51