Amperex 6DJ8 tube construction

The one on the left is Holland.

The one on the right looks to be Blackburn, England or Japanese.

If Blackburn it will have etched codes on the glass.

Japanese "Mullard" 6922 types usually have a slanted getter flashing that is higher/lower on opposite sides of the tube, but not always.

This "slant' was also common with some Eastern Euro 12 volt tubes from the 70's and maybe later on.

Anyway, both are desirable tubes if they test up to snuff.

DeKay

Richardson Electronics purchased the Amperex name years ago and rebadged/boxed tubes of various origins as Amperex.

The only ones I purchased were 6dj8's and 6922's that were of Japanese manufacture.

DeKay