Talyor TZ40 triode

This valve measures 167x60mm overall and has a 4 pin base.

The valve carries the markings "Taylor Tube custom build TZ40 Made in the United States of America". The anode appears to be of graphite construction. It is a zero-bias version of the Taylor T40 and a close equivalent of the DA41 or British VT76. Additionally the second example carries the wording "Custom built".