It has gray plates and a large halo getter (I65 series).

The Ontario, Canada factory code is etched in the glass.

The white label has the Philips logo and the Blackburn, UK factory code is etched in the glass.

It has smooth gray plates and a halo getter, just like the famed Telefunken 12AX7 tube it was modeled after. The Ei ECC83 / 12AX7 tubes in these precisely matched pairs, trios, quads, and sextets were made in pre-war Yugoslavia and labeled for Audio Research.

They have smooth gray plates, just like the famed Telefunken 12AX7 tubes they were modeled after.

This 1974 Amperex 12AX7 / ECC83 tube has gray plates and a dimple disc getter.

The orange label has the Amperex globe logo and the Heerlen, Holland factory code is etched in the glass.

Tube tests as new with balanced sections and phono/V1 grade noise levels.

The 1964 Telefunken 12AX7 / ECC83 tubes in this precisely matched pair have smooth plates and the diamond imprint in the base. Both tubes test as new with balanced sections and phono grade noise levels.

This 1965 Mullard 12AX7 / ECC83 tube has short gray plates with copper grid posts and a halo getter (I63 series). Both tubes test as new with phono / V1 grade noise levels. The yellow or green print on the glass has the Sylvania logo (label may be partial or missing). This late 1960s-early 1970s military spec Sylvania 12AX7WA tube has long gray plates with copper grid posts and a halo getter.

The red label has the Hammond logo and the Blackburn, UK factory code is etched in the glass. This RCA 12AX7A tube has gray plates and a halo getter. The late 1960s Siemens E83CC tubes in this precisely matched pair are premium quality 12AX7 / ECC83 tubes. This Siemens E83CC tube is a premium quality 12AX7 / ECC83 tube. The white label has the Siemens logo and the Munich factory code is etched in the glass. This 1960s Siemens 12AX7 / ECC83 tube was made in West Germany (I61 or I62 series) and labeled for other companies. The green print on the glass reads "JAN 12AX7WA" (labels may be partial). The military spec Sylvania 12AX7 tubes in this precisely matched pair have gray plates with copper grid posts and halo getters.

This 1951 GE 12AX7 tube has distinctive long silver / black plates with copper grid posts. The 1965 Mullard 12AX7 / ECC83 tubes in this precisely matched pair have gray plates with copper grid posts (I63 series).