1) German surname 2) Vacuum tube
Found on
https://www.crosswordclues.com/clue/wunderlich
[vacuum tube] Wunderlich refers to a series of vacuum tubes introduced in the early 1930s. Wunderlichs were designed to be used as full-wave detectors in AM radio receivers. However, because of their unusual design, they were rarely used in commercially manufactured receivers. The tube is named for its inventor, Norman Wunderlich. ==Structu...
Found on
http://en.wikipedia.org/wiki/Wunderlich_(vacuum_tube)
No exact match found.
