Made in USA by Ken-Rad.
Half black glass, black plate.
This type is identical electrically with type 6F6.

Nos. Some in original box and some no box. Matched pair are available.

Made in USA by Ken-Rad.
Half black glass, black plate.
This type is identical electrically with type 6F6.
Used but test as nos tube. No box. 
Matched pair and quad are available.

Made in USA.
Clear glass, black plate.
This type is identical electrically with type 6F6.

Nos in original box. Matched pair are available.

Made in USA by Sylvania.

Round black plate.

Nos in original box. Matched pair are available.

Made in USA by Sylvania.

Round black plate. Green leaf print

Nos in original box

Made in USA by Arcturus.
Black plate. Bottom D-Getter.
Very good midrange detail and soundstage. Super tube.
Engrave base or orange print.
Nos but some no original box. Tested matched pair are available.

Made in USA by Arcturus.
Muddy black plate. Bottom Pan-Getter. 
One of the first and super rare version of 45s family from USA with smoke glass.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Nos in original box. Tested matched (less than 1.5%)

Made in USA by Arcturus.
Blue balloon type with Ribbed black plate. Bottom Pan-Getter. 
Super rare tube. One of top-five list of most wanted 45s tubes in the world.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Nos in original box. Tested very strong.

Made in USA by Arcturus.
Early version of blue tube from Arcturus with Ribbed black plate. Bottom Cup-Getter. 
Super rare tube. One of top-five list of most wanted 45s tubes in the world.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Used. Tested very strong.

Made in USA by Arcturus.
Early version of blue tube from Arcturus. Bottom Cup-Getter. 
Super rare tube. One of top-five list of most wanted 45s tubes in the world.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Used. Tested very strong as new.