12DW7 / 7247 tubes

This 1960 Mullard 7247 is a high reliability 12DW7 preamp tube. It was made in Great Britain (Blackburn factory codes) and labeled for other companies. It has ribbed gray plates and a halo getter. Tube tests good.

This 1960s Raytheon 7247 tube is a high reliability 12DW7 preamp tube. It has gray plates with copper grid posts and a halo getter. The yellow print on the glass with the Raytheon logo is mostly gone. Tube tests as new.

This 1960s Sylvania 12DW7 tube has long gray plates and a halo getter. The yellow print on the glass has the Sylvania logo. Tube tests as new with very low noise. It ships in its original box or a new white box.