(slightly microphonic tube) 12AT7WA=CV455 Mullard NOS "curved D getter halo" copper grid posts 1959 perfect printing (8/9ma)
(slightly microphonic tube) ECC81=12AT7 Mullard NOS "curved D getter halo" copper grid posts 1955 (9.2/10.6ma)
(slightly microphonic) 5687 Raytheon black plates NOS "square" getter halo 1950's (37/39ma) (strong Ma and Gm)
12AT7 Siemens Halske Germany D getter NOS 1957 (6ma/8ma)
12X4 CBS NOS black plates "D" getter 1959 (48/40 and 48/40)
12X4 GE gray plates "D" getter NOS 1960 (50/40 and 50/40)
407A LM Ericsson Sweden like new 1960's (41/26 and 42/26)
407A LM Ericsson Sweden used/good 1960's
407A Western Electric like new 1968 in white box (54/26 and 64/26)
407A Western Electric used/good 1959 (32/26 and 34/26)
407A Western Electric used/good 1962 (35/26 and 42/26)
6BL7GT Sylvania low hours 1953 D = rectangle getter halo long scratch on base (33.5/37.5ma)
6BL7GTA GE gray plates NOS 1974 (47/53ma)
6BL7GTA Sylvania used/good 1960's (31/33ma)
6X4 GE like new 1950's "D" getter (54/40 and 54/40)
6X4W GE used/tests like new 1960 era "D" getter (52/40 and 52/40)
UY41=31A3 Amperex Bugle Boy France NOS 1964 (0 in stock)
UY41=31A3 Philips Miniwatt "D" getter halo NOS 1958 (1 in stock)
