I have a bunch of nice vintage tubes for sale. All tubes were tested for emissions, shorts, and grid leakage, with the 12AT7 and 6201 sound tested as well.
All prices include shipping and paypal fees.

NIB 1959 Raytheon black plate, halo getter 5670WA military version. $15
SOLD!
1960s Western Electric black plate, square getter 2C51/396a/5670. I have 2 strong tested used tubes and 1 NIB. $21 for strong used tube and $27 NIB.
Both strong used and 1 NIB square getters sold. ALL SOLD!
1970s Western Electric black plate, halo getter 2C51/396a/5670. I have 2 strong tested used tubes for $21 each.
PAIR SOLD!
Early (probably 1940s) GE black frosted glass 6V6 GT matched pair. These tested at 91 and 93 for emissions, with 70 being minimum on my Sencore TC162. $18 for the pair.

1960s Sylvania 12AT7 black plate, square getter. If your system requires more warmth than neutral, then these are good candidates. Besides the RCA black plate 12AT7, these are among my favorite 12AT7/6201/6060/ECC81/ECC801 types. Even though they are used, they tested like new and sound wonderful. $26 matched pair. Many happy customers agree.
PAIR SOLD!
1960s GE 6201 (military/industrial 12AT7) grey plate, halo getter. If you prefer a relatively neutral sound, then this pair may be just the ticket. This pair was used to evaluate the Virtue ICEBlock mono amps in my review here on AC. They tested like new, $28 matched pair.
PAIR SOLD!Thanks for looking!